• X

    Sign in

    to continue to ilmkidunya.com

    X

    Forgot Password

    to continue to ilmkidunya.com

    X

    Register Type

    Please Provide following information to Register

    • Student
    • Tutor
    • Consultant
    • Employer
×
Chemistry Guess Papers 2021 Class 12
12th Class Menu

In chemistry, we study the chemicals, their uses and their properties. Chemistry is the most interesting and amazing subject. Chemistry is not only an important science subject but also has great importance in our practical life. For scoring good marks in chemistry, 2nd year chemistry guess paper 2021 are very important. For the students of 2nd year, 12th class chemistry guess paper is available here for the students. You can attempt your chemistry exam more easily if you do practice of chemistry guess paper 2021 class 12. In guess paper, experienced teachers share their estimation and experience that which type of questions will be asked in exam. These chemistry 2nd year guess paper 2021 are very important. Many of the questions in board exam will be same like these.

2nd Year Chemistry Guess Papers 2021

We designed these guess papers just according to your board exam. The students will find ease in attempting the board exam after practice these guess papers. Download 2nd year chemistry guess paper in pdf from here free of cost. We are providing you many guess papers of chemistry for all Punjab boards so that you can get maximum practice. These guess papers are very advantageous for better performance in the chemistry board exam 2021. We are providing these important guess papers of chemistry 12th class here free for all students.

12th Class Chemistry Guess Papers 2021

We tried to prepare these guess papers of chemistry 12th according to Punjab board pattern of 2021. You can get good marks in the chemistry exam if you practice these guess papers before going to exam. This is very good chance which is provided to all students of 12th class online. The students can easily get the guess papers of all boards of Punjab in pdf. Check 2nd year chemistry guess paper 2021 on ilmkidunya and enjoy the better preparation. Ilmkidunya is providing the most important guess papers to all students online for free which is the best facility for all students.

 

ACCELERATED LEARNING PROGRAMME (ALP)

LAHORE, SAHIWAL, GUJRANWALA, FAISALABAD, MULTAN, BHAWALPUR,RAWALPINDI , DERA GHAZI KHAN, AZAD KAHSMIR , SARGODHA

                                     

12th CLASS CHEMISTRY  GUESS PAPERS

 

 CHAPTER NO.1        

PERIODIC CLASSIFICATION OF ELEMENTS AND PERIODICITY.

MULTIPLE CHOICE:

  1. Keeping in view the size of atoms, which order is the correct one?
  1. Mg > Sr
  2. Ba > Mg
  3. Li > Na
  4. C > I
  1. 11- Mark the correct statement.
  1. Na+ is smaller than Na tom
  2. Na+ atom than Na atom
  3. Cl- is smaller than Cl atom
  4. Cl+ (ion) and Cl (atom) are equal in size
  1. Among the elements of VA group which has highest ionization energy.
  1. Nitrogen
  2. Phosphorus
  3. Antimony
  4. Bismuth
  1. Chose the correct statement.
  1. Metallic character increase down the group
  2. Metallic character decrease down the group
  3. Does not change
  4. First increase than decrease
  1. Which statements is incorrect.
  1. All the metals are good conductor of electricity
  2. All metals are good conductor of hear
  3. All the metals form positive ions
  4. All the metals form acidic oxide
  1. Mark the correct statement
  1. All lanthanides are present in the same group
  2. All halogens are present in the same period.
  3. All the alkali metals are present in the same period
  4. All the noble gases are present in the same period.
  1. Which statement is correct?
  1. Hydrogen resembles in properties with IA, IV A and VII A elements.
  2. Hydrogen resembles in properties with IIIA, IVA , and VI A elements.
  3. Hydrogen resembles in properties with II A, IV A and VI A elements.
  4. Hydrogen resembles in properties with II A, III A and VI A elements.
  1. Mark the correct statement.
  1. The ionization energy of calcium is lower than that of barium.
  2. The ionization energy of calcium is lower than that of magnesium
  3. The ionization energy of Calcium is higher than that of Beryllium
  4. The ionization energy of Calcium is lower than that of Strontium.
  1. Mark the correct statement.
  1. Electron affinity is a measure of energy required to remove the electron
  2. Electron affinity is a measure of energy released by adding an electron.
  3. Electron affinity is measure of energy released by removing electron.
  1. Mark the correct statement.
  1. Metallic character increases down the group
  2. Metallic character increases from left to right along a period
  3. Metallic character remains the same from left to right along peiod.
  4. Metallic character remains the same down the group.
  1. Mark the correct statement.
  1. Melting points of halogens decrease down the group
  2. Melting points of halogens increase down the group
  3. Melting points of halogens remain the same throughout the group.
  4. Melting points of halogens first increase and then decrease down the group

SHORT QUESTIONS.

  • Why melting and boiling points of elements belonging to groups VA –VII A are lower.
  • Discuss the trend of ionization energy in periodic table.
  • Why first ionization energy of Mg is greater than that of Na?
  • Define electron affinity. Give its trend in Periodic table.
  • Write any two resemblances of hydrogen with Alkali Metals.
  • Give reason that hydration energy of Al3+ ions is more than Mg2+ ions.

LONG QUESTIONS:

  • What are periods? Describe different periods of periodic table.
  • Discuss four blocks in modern periodic table.
  • Define Ionization energy? How does it differ along the period and down the group of periodic table?
  • Why diamond is non-conductor and graphite is fairly a good conductor.
  • How the classification of elements in different blocks in understanding their chemistry.
  • How do you justify the position of Hydrogen at the top of various group?
  • Why ionization energy decreases down the group and increases along a period.
  • Explain the variation in melting points along the short periodic.
  • How hydrogen resembles with group I-A elements and differs group IV-A elements.
  • Discuss position of hydrogen in group 1st and VII (A) of periodic table.

CHAPTER NO.2          S- BLOCK ELEMENTS.

MULTIPLE CHOICE:

  1. Which one of the following does not belong to alkaline earth metals?
  1. Be
  2. Ra
  3. Ba
  4. Rn
  1. Which is not an alkali metal?
  1. Francium
  2. Cesium
  3. Rubidium
  4. Radium
  1. Chile saltpeter has the chemical formula.
  1. NaNO3
  2. KNO3
  3. Na2B4O7
  4. Na2CO3,H2O
  1. The ore CaSO4.2H2O has the general name.
  1. Gypsum
  2. Dolomite
  3. Calcite
  4. Epsom salt.
  1. CaCl2 is added to NaCl in Down’s cell to.
  1. Decrease solubility
  2. Decrease dissociation
  3. Decrease melting point
  4. Decrease conductivity
  1. Which element is deposited at cathode during electrolysis of brine?
  1. Na
  2. O2
  3. Cl2
  4. H2
  1. Down cell is used to prepare.
  1. Sodium carbonate
  2. Sodium bicarbonate
  3. Sodium metal
  4. Sodium hydroxide

SHORT QUESTIONS:

  • Why group II – A elements are called Alkaline Earth Metals.
  • Give reason that alkali metals are strong reducing agents.
  • Why is CaCl2 added in molten NaCl in Down’s cell
  • Write the advantages of Nelson’s cell.
  • Differentiate between Alkali and Alkaline earth metal.
  • Lithium is least reactive element of all alkali metals. Give reasons.

LONG QUESTIONS:

  • Show four chemical reactions in which Li behaves different from elements of its own group.
  • Discuss peculiar behavior of Beryllium with respect to other member of II-A group.
  • Describe the commercial preparation of sodium by Down’s cell. What are advantages of this process?
  • Describe preparation of sodium hydroxide by Nelson’s Diaphragm cell.

 

CHAPTER NO.3          GROUP III A AND GROUP IV A ELEMENTS.

MULTIPLE CHOICE:

  1. Which elements forms an ion with charge +3.
  1. Be
  2. Al
  3. C
  4. Si
  1. Which elements forms an ion with charge 3+
  1. Be
  2. Al
  3. Si
  4. C
  1. Which of the following elements is not present abundantly in earth’s crust.
  1. Silicon
  2. Aluminium
  3. Sodium
  4. Oxygen
  1. Chemical composition of Colemanlte is.
  1. Ca2B6O11.5H2O
  2. CaB4O7.4H2O
  3. CaNaB5O9.8H2O
  4. Na2B4O7.4H2O
  1. Tincal is a mineral of.
  1. Al
  2. Boron
  3. Silicon
  4. Carbon
  1. The chief ore of aluminum is.
  1. Na2AlF6
  2. Al2O3.2H2O
  3. Al2O3
  4. Al2O3.H2O
  1. Bauxite is a mineral of.
  1. B
  2. Be
  3. Mg
  4. Al+
  1. The aqueous solution of Borax is.
  1. Acidic
  2. Basic
  3. Neutral
  4. Corrosive
  1. Boric Acid can not be sued.
  1. An antiseptic in medicine
  2. For Washing eyes
  3. In soda bottles
  4. For enemies and glazes
  1. Which metal is used in the thermite process because of its activity?
  1. Iron
  2. Copper
  3. Aluminium
  4. Zinc

 

SHORT QUESTIONS:

  • Aqueous solution of borax is alkaline in nature Justify the statement.
  • What is reaction of heat on orthoboricacid, H3BO3?
  • Give reactions of Aluminium with dilute and concentrated H2SO4.
  • Outline any four uses of aluminum?
  • Give two similarities between carbon and silicon.

 

LONG QUESTIONS:

  • What is the action of an aqueous solution of borax on litmus?
  • Why is aluminium not found as a free element? Explain the chemistry of borax bead test.
  • How will you convert boric acid into borax and vice versa?
  • Give the names and the formulas of different acids of boron.

 

CHAPTER NO.4          GROUP VA AND GROUP VI A ELEMENTS.

MULTIPLE CHOICE:

  1. Among group VA elements, the most electronegative is.
  1. Sb
  2. N
  3. P
  4. As
  1. Laughing gas is chemically.
  1. NO
  2. NO3
  3. N2O
  4. N2O4
  1. Which of the following species has the maximum number of unpaired electrons.
  1. O2
  2. O2+
  3. O2-
  4. O2-2
  1. Oxidation of NO in air produces.
  1. NO2
  2. N2O3
  3. N2O4
  4. N2O5
  1. Which of the following is a reddish brown gas, when metal reduces HNO3?
  1. N2O
  2. NO
  3. N2O5
  4. NO2
  1. The brown gas formed when metal reduces HNO3 is.
  1. N2O3
  2. N2O5
  3. NO2
  4. NO
  1. Which catalyst is used in contact process for manufacture of H2SO4.
  1. Fe2O3
  2. V2O5
  3. Al2O3
  4. MnO2
  1. Maximum electronegative character is present in.
  1. Sb
  2. N
  3. P
  4. Si

SHORT QUESTIONS:

  • How does nitrogen differ from other elements of its group?
  • Why does aqua regia dissolve gold and platinum?
  • Why the elements of group VI A other than oxygen show more than two oxidation states.
  • Write down a comparison of the properties of oxygen and sulphur.
  • Write down the equation for the reaction between conc. H2SO4 and copper and explain what type of reaction is it.
  • “N2O supports combustion” Give two reactions in favour of the statement?
  • What happens when NO2 is dissolved in water?
  • Give reaction of Cu with dil. HNO3 and conc. HNO3.
  • Write any four uses of nitric acid?
  • How does HNO3 act as an oxidizing agent?
  • What is aque-regia?
  • Write two dissimilarities of oxygen and sulphur?
  • What are the optimum condition for the manufacture of H2SO4 in the contact process?
  • Write two reactions in which sulphuric acid acts as a dehydrating agent.
  • How sulphuric acid act as an oxidizing agent.
  • Write any four important uses of H2SO4

LONG QUESTIONS:

  • Explain Birkeland and Eyde’s process for preparation of HNO3.
  • Describe the preparation of HNO3 gas. Also give its reactions.
  • Discuss the trends in physical properties of group VI A elements.

 

CHAPTER NO.5          THE HALOGENS AND THE NOBLE GASES.

MULTIPLE CHOICE:

  1. Which of the strongest acid.
  1. HClO
  2. HClO2
  3. HClO3
  4. HClO4
  1. Which of the following statement is correct.
  1. Bond energy of I2 is less than Cl2
  2. Bond energy of F2 is less than I2
  3. Bond energy of Cl2 is less than F2
  4. Bond energy of Cl2 is greater than I2
  1. Which of the following hydrogen halide is the weakest acid in solution.
  1. HF
  2. HCl
  3. HBr
  4. HI
  1. Hydrogen bond is strongest between the molecules of.
  1. HI
  2. HBr
  3. HF
  4. HCl
  1. Which halogen occurs naturally in a positive oxidation state?
  1. Florine
  2. Chlorine
  3. Bromine
  4. Iodine
  1. The anhydride of HClO4 is.
  1. CIO3
  2. CIO
  3. Cl2O5
  4. Cl2O7
  1. Weakest acidic solution will be of.
  1. HF
  2. HBr
  3. HI
  4. HCl

SHORT QUESTIONS:

  • Arrange the following ions in order of increasing size  F, CL- , Br-, I-
  • Why iodine has metallic luster?
  • Why the lattice energy of Fluorides is greater than Chlorides.
  • Halogens are strong oxidizing agents. Justify.
  • On what factors oxidizing power of halogen depends upon.
  • Why oxidizing power of halogens decreases down the group?
  • HF is a weak acid while HCl is strong acid. Give reason.
  • Write down reaction of chlorine with cold and hot NaOH.
  • HXO4 is strongest oxyacid. Explain.
  • Write four uses of Bleaching powder.
  • Write Chemical reactions of Bleaching powder with HCl and NH3
  • What happen when bleaching powder reacts with the following reagents dil H2SO4 excess of conce. H2SO4, NH3, HI and CO3.

LONG QUESTIONS:

  • What is Bleaching Powder? How is it prepared commercially?
  • How bleaching powder is prepared? Give its uses.

 

CHAPTER NO.6          TRANSITION ELEMENTS.

MULTIPLE CHOICE:

  1. Group VI B of transition element contains.
  1. Zn, Cd, Hg
  2. Cr, Mo,W
  3. Mg, Co, V
  4. Zn, Fe, W
  1. Typical transition element is.
  1. Sc
  2. Co
  3. Ra
  4. Y
  1. The colour of transition metal complexes is due to.
  1. d – d transitions of electrons
  2. Paramagnetic nature of transition elements.
  3. Ionization
  4. Los of s-electrons.
  1. The strength of binding energy of transition elements depends upon.
  1. Number of electron pairs
  2. Number of unpaired electrons
  3. Number of neutrons
  4. Number of protons
  1. Which of the following has greatest number of unpaired electrons.
  1. Fe
  2. Fe+2
  3. Mn+2
  4. Cr+3
  1. Which element form an ion with charge +3
  1. Chromium
  2. Copper
  3. Lead
  4. Zinc
  1. Which of the following is a non-typical transition element.
  1. Cr
  2. Mn
  3. Zn
  4. Fe
  1. Which one is non-typical transition element?
  1. Cr
  2. Mn
  3. Zn
  4. Fe

 

SHORT QUESTIONS:

  • Give four important characteristics of transition elements.
  • What are interstitial compounds?
  • Give reason for the development of colours in the transition complexes.
  • What is Tin plating and what happens when it is damaged?
  • Define sacrificial corrosion.

LONG QUESTIONS:

  • Mn2+ and Fe2+ have the strongest paramagnetic behavior while Sc3+ and Zn2+ have the lowest. Discuss.
  • Explain the following properties of transition metals.
  1. Paramagnetism
  2. Colour
  • What is corrosion? Explain the electrochemical theory of corrosion.

CHAPTER NO.7   FUNDAMENTAL PRINCIPLES OF ORGANIC CHEMISTRY.

MULTIPLE CHOICE:

  1. Double bond consists of.
  1. One sigma and one pi bonds
  2. Two sigma bonds
  3. One sigma and two pi bonds
  4. Two pi bonds
  1. The state of hybridization of carbon in methane is.
  1. Sp3
  2. Sp2
  3. Sp
  4. dsp2
  1. Presence of double or triple bond is sign of.
  1. Unsaturation
  2. Saturation
  3. Addition
  4. Substitution
  1. Linear shape is associated with which set of Hybrid orbital.
  1. Sp
  2. Sp2
  3. Sp3
  4. dsp2
  1. Which set represent the planner triangular shape.
  1. Sp3
  2. Sp2
  3. Sp
  4. dsp2
  1. Ethers show the phenomenon of.
  1. Position isomerism
  2. Functional group isomerism
  3. Metameric
  4. Cis-trans isomerism

SHORT QUESTIONS:

  • What is vital force Theory?
  • Define “Thermal cracking”.
  • Define catenation?
  • What is catalytic cracking?
  • Octane number of gasoline is improved by reforming. Explain.
  • Differentiate between Alicyclic and aromatic compounds.
  • What are allcyclic compounds? Give an example.
  • Write name and structure of two aromatic heterocyclic compounds.
  • Define tautumerism, give an example.
  • 1-Butyne does not show geometrical isomerism but 2-Butene does. Give reason?
  • Why is restricted rotation necessary to show the geometrical isomerism?
  • What is metamerism? Give an example.

LONG QUESTIONS:

  • Define cracking and discuss its different types.
  • What are homocyclic and heterocyclic compounds? “Give one example of each.
  • What is meant by a functional group? Name typical functional group containing oxygen.
  • Write a short note on cracking of hydrocarbons.
  • What is orbital hybridization? Explain sp3, sp2 and modes of hybridization of carbon.
  • Define cracking of petroleum. Explain its various types and importance.
  • Explain reforming of petroleum with the help of suitable example
  • How organic compounds are classified? Give suitable examples of each types.
  • What is orbital hybridixation? Explain sp2 mode of hybridization of carbon
  • Define hybridization and also describe sp- hybridization with reference ethyne.
  • Explain sp2 hybridization along with describing the structure of Ethen eon the basis of this type of hybridization.
  • Discuss geometric isomerism with at least two examples.
  • Describe briefly the different types of structural Isomerism.

CHAPTER NO.8          ALIPHATIC HYDROCARBONS.

MULTIPLE CHOICE:

  1. Formula of Chloroform is.
  1. CH3Cl
  2. CH2Cl2
  3. CHCl3
  4. CCl4
  1. B,B- dichloro ethyl sulphide is commonly known as.
  1. Mustard gas
  2. Laughing gas
  3. Bio gas
  4. Phosgene gas
  1. Synthetic rubber is made by polymerization of.
  1. Chloroform
  2. Acetylene
  3. Divinyl acetylene
  4. Chloroprene
  1. Vinyl acetylene combine with hydrochloric acid to form.
  1. Polyacetylene
  2. Benzene
  3. Chloroprene
  4. Divinyl acetylene
  1. Preparation of vegetable ghee involves.
  1. Halogenation
  2. Hydrogenation
  3. Hydroxylation
  4. Dehydrogenation
  1. The presence of double bond in a compound is the sign of.
  1. Saturation
  2. Unsaturation
  3. Substitution
  4. None of these
  1. Which is used for artificial ripening of fruits?
  1. Ethane
  2. Ethene
  3. Ethyne
  4. Methane
  1. Which compound is most reactive?
  1. Benzene
  2. Ethane
  3. Ethyne
  4. Ethene
  1. When 1-chloropropene is reacted with alcoholic KOH, the product obtained is.
  1. Propane
  2. Propene
  3. Propyne
  4. Butane

SHORT QUESTIONS:

  • Write structural formulas of the following:
  1. But-1- en- 3 –yne
  2. Vinyl acetylene.
  • Prepare alkanes from clemmensen and Wolf-Kishner’s reduction methods from aldehyde or ketone?
  • How ethane can be prepared by Kolb’s electrolysis?
  • What is effect of branching on boiling points of alkanes?
  • Sigma bonds are inert in alkanes. Justify.
  • What is heat of combustion?
  • Convert CH4 to CH2O
  • Give four uses of methane?
  • Convert methane to ethane?
  • Ethene can be converted into ethyl alcohol. Write equation.
  • What is Baeyer’s test? What is its uses?
  • Describe how we can be distinguish between ethane and ethane?
  • Explain Markownikov’s rule with one example.
  • Define Rany nickel. Give its uses?
  • Give the mechanism of ozonolysis of ethane?
  • What is hydrogenolysis? Give an example.
  • How will you convert 1- butane to 1 – butyne.
  • How ethyne is converted to ,(a)- Acetaldehyde  (b) Benzene.
  • How Cis and Trans alkenes are obtained from alkynes.
  • Distinguish between ethane and ethyne by a chemical test.

LONG QUESTIONS:

  • Discuss any two method of preparation of alkenes.
  • Discuss acidic nature of alkynes with at least two examples
  • Write a note on polymerization of ethyne.

CHAPTER NO. 9                  AROMATIC HYDROCARBONS.

MULTIPLE CHOICE:

  1. The conversation of n-hexane to benzene by heating in presence of Pt is called.
  1. Isomerization
  2. Dealkylation
  3. Rearrangement
  4. Aromatization
  1. Benzene cannot undergo reactions.
  1. Substitution
  2. Addition
  3. Oxidation
  4. Elimination
  1. During nitration of benzene the active nitrating agent is.
  1. NO-3
  2. NO2
  3. NO-2
  4. NO+2
  1. Which of the following acid can be used as a catalyst in Friedal crafts reaction?
  1. AlCl3
  2. HNO3
  3. BeCl2
  4. NaCl
  1. The electrophile used for sulphonation of benzene is.
  1. SO3
  2. SO4
  3. HSO4 2
  4. H2SO4
  1. In the given compounds the most reactive one is.
  1. Benzene
  2. Ethene
  3. Ethane
  4. Ethyne
  1. Sooty flame on burning aromatic –compound is due to.
  1. High percentage of hydrogen
  2. Ring structure
  3. High percentage of carbon
  4. Resistant reaction with air

SHORT QUESTIONS:

  • What are monocyclic and polycyclic aromatic hydrocarbons?
  • Write names and draw structures of three possible isomers of Xylene?
  • Give two reasons to rule out straight chain structure of benzene?
  • What information’s are obtained about structure of benzene from X-ray studies?
  • Define resonance energy? What is the resonance energy of Benzene?
  • Why benzene is less reactive than alkenes although it has three pi bond in it.
  • Benzene can be prepared commercially form acetylene. Give reaction with conditions?
  • What is Wurtz-Fritting reaction?
  • Give the mechanism of nitration of Benzene?
  • Give mechanism of sulphonation of Benzene?
  • Convert bezne in to  (i)- Toluene    (ii)- Acetophenone
  • Write the mechanism of alkylation of benzene?
  • Write the reaction when mixture of benzene vapours and oxygen is passed over heated vanadium pentoxide.
  • How toluene can be converted to benzoic acid?
  • What is meant by meta directing group.

LONG QUESTIONS:

  • Describe the structure of benzene on the basis of atomic orbital treatment.
  • Write four methods for the preparation of benzene.
  • What are Fridel-Crafts reactions? Explain mechanisms of alkylation and acylation of benzene.
  • Write the mechanism for  (i)  Sulphonation    (ii)-  Nitration of Benzene
  • Describe the Mechanism of Fridelcraft’s alkylation of Benzene.

CHAPTER NO. 10.      ALKYL HALIDES

MULTIPLE CHOICE:

  1. For which mechanisms, the first step involved is the same.
  1. E1 and E2
  2. E1 and SN1
  3. E1 and SN2
  4. E2 and SN2
  1. Which one of the following is not a nucleophile?
  1. H2O
  2. H2S
  3. BF3
  4. NH3
  1. SN2 reactions can be carried out with.
  1. Primary alkyl halides
  2. Secondary alkyl halides
  3. Tertiary alkyl halides
  4. All of these
  1. Elimination bimolecular reactions involve.
  1. First order kinetics
  2. Second order kinetics
  3. Third order Kinetics
  4. Zero order kinetics
  1. The rate of E1 reaction depends upon.
  1. The concentration of substrate
  2. The concentration of nucleophile
  3. The concentration of substrate as well as nucleophile
  4. None of these

SHORT QUESTIONS:

  • What are primary and tertiary Alkyl Halides? Give examples
  • Prepare alkyl halides from alcohols by two methods?
  • Write excellent method to prepare alkyle iodide.
  • What is leaving group? Give examples.
  • Define electrophile and nucleophile?
  • Give general mechanism patterns of SN2 reaction.
  • Discuss E2 mechanism.
  • What are elimination reactions? Give example E1 reaction.
  • What are B-Elimination reactions?

LONG QUESTIONS:

  • What are SN reaction? Differentiate between Sn1 and Sn2 reaction.
  • Discuss Sn2 reactions of alkyl halides in detail.
  • Define Nucleophilic substitution reactions and discuss the mechanisms of SN1 reaction.
  • Define elimination reactions and discuss the mechanism of E1 reactions.

CHAPTER NO. 11                ALCOHOLS, PHENOLS AND ETHERS.

MULTIPLE CHOICE:

  1. Which compound is called universal solvent
  1. H2O
  2. CH3OH
  3. C2H5OH
  4. CH3- O-CH3
  1. Rectified spirit contains alcohol about.
  1. 80%
  2. 85%
  3. 90%
  4. 95%
  1. Which enzyme is not used in fermentation of Starch?
  1. Urea
  2. Diastase
  3. Zymase
  4. Invertase
  1. The compound which is more soluble in water.
  1. C6H5OH
  2. C2H5OH
  3. C6H12OH
  4. C7H15OH
  1. In t-butyl alcohol, the tertiary carbon is bonded to.
  1. Three hydrogen atoms
  2. Two hydrogen atoms
  3. One hydrogen atom
  4. No hydrogen atom
  1. Ethanol can be converted into ethanoic acid by.
  1. Oxidation
  2. Fermentation
  3. Hydrogenation
  4. Hydration
  1. Which of the following shows maximum hydrogen bonding with water.
  1. CH3OH
  2. C2H5OH
  3. CH3- O-CH3
  4. C6H5OH
  1. Which of the following will have highest boiling point.
  1. Methanol
  2. Ethanol
  3. Propanol
  4. 2-hexanone
  1. Alcohol obtained by fermentation process never exceed beyond.
  1. 14%
  2. 10%
  3. 16%
  4. 95%

SHORT QUESTIONS:

  • Why ethyl alcohol is liquid while Ethyl chloride is gas at room temperature.
  • Absolute alcohol cannot be prepared by fermentation process. Why?
  • Explain denaturing of alcohol?
  • How will you distinguish between methanol and ethanol?
  • How will you distinguish between 1- propanol and 2- propanol?
  • Write four uses of each methanol and ethanol.
  • Prepare phenol from chlorobenzene by Dow’s method.
  • Write down two methods for the preparation of phenol.
  • Why Phenol is acidic while alcohol is not?
  • Explain acidic behavior of phenol.

LONG QUESTIONS:

  • How ethyl alcohol is obtained by the fermentation of molasses and starch.
  • Give industrial preparation of Ethyl alcohol.
  • Write two methods for the preparation of phenol. How does phenol react with   i) con. HNO3  ii)Bromine water.
  • What is Dow’s method for the preparation of Phenol? Explain acidic behavior of phenol.

CHAPTER NO. 12                ALDEHYDES AND KETONES.

MULTIPLE CHOICE:

  1. The carbon atom of a carbonyl group is.
  1. Sp –hybridized
  2. Sp2- hybridized
  3. Benzoic acid
  4. Butanoic acid
  1. The carbon atom of a carbonyl group is.
  1. Sp hybridized
  2. Sp2- hybridized
  3. Sp3- hybridized
  4. Sp-Sp bhbridized
  1. Acetone reacts with HCN to form a cyanohydrin. It is an example of .
  1. Nucleophilic addition
  2. Substitution reaction
  3. Elimination reaction
  4. None
  1. Cannizzaro’s reaction is not given by.
  1. Formaldehyde
  2. Acetaldehyde
  3. Benz aldehyde
  4. Trimethylacetaldehyde
  1. Which compound will not give iodoform test on treatment with I2/NaOH
  1. Acetaldehyde
  2. Acetone
  3. Butanone
  4. 3-Pentanone
  1. Which of the following reagent will reacts with both aldehyde and ketones.
  1. Tollen’s reagent
  2. Grignard’s Reagent
  3. Fehiing’s reagent
  4. Benedict ’s reagent.
  1. Formalin is.
  1. 10% solution of formaldehyde in water
  2. 20% solution of formaldehyde in water
  3. 40% solution of formaldehyde in water
  4. 60% solution of formaldehyde in water
  1. Which of the following has highest boiling point.
  1. Mathanal
  2. Ethanal
  3. Propanal
  4. 2-Hexanone
  1. Which test is called silver mirror test.
  1. Tollen’s test
  2. Fehling’s test
  3. Benedict’s tes
  4. Sodium nitro preside test

SHORT QUESTIONS:

  • Give industrial preparation of acetaldehydes.
  • How formaldehyde is prepared on industrial scale.
  • Prepare acetone from calcium Acetate.
  • Addition of HCN on aldehydes and Ketones is a base catalyzed reaction?
  • Define nucleophilic addition reaction with an example.
  • Convert acetaldehyde to Lactic acid.
  • Describe briefly the mechanism of base catalyzed nucleophilic addition to carbonyl compound.
  • Give general mechanism of acid catalyzed addition reactions of aldehydes.
  • Convert acetaldehyde into paraldehyde by a reaction which is done in presence of dilute H2SO4?
  • What is halo form reaction?
  • What is the use of iodoform test to distinguish between acetaldehyde and formaldehyde?
  • What is Cannizzaro’s reaction? Write one example.
  • How a-hydroxy acids are produced from aldehyde and ketones.
  • What is silver mirror test? What is its importance?
  • Fehling’s solution reacts with aldehydes to give red ppt. justify it.
  • Write Fehling’s solution test?
  • What is sodium nitroprusside test?
  • Write down four uses of Acetaldehyde?
  • Write four uses of formaldehyde?

LONG QUESTIONS:

  • Define aldol condensation. Give its mechanism
  • Define Cannizaro’s reaction. Explain its mechanism with a suitable example.
  • Write four tests by which aldehydes can be distinguished from ketones.
  • Write any four uses of acetaldehyde.

CHAPTER NO. 13       CARBOXYLIC ACID.

MULTIPLE CHOICE:

  1. Which of the following is not a fatty acid.
  1. Propionic acid
  2. Acetic acid
  3. Phthisic acid
  4. Butanoic acid.
  1. Which of the following is not a fatty acid.
  1. Carboxylic acid
  2. Glutamic acid
  3. Aspartic acid
  4. Phthalic acid
  1. Which of the following reagent in used to reduce carboxylic group to alcohol?
  1. N2/NI
  2. H2/PI
  3. NaBH4
  4. LiAlH4
  1. Which derivative cannot be prepared directly from acetic acid?
  1. Acetamide
  2. Acetyl chloride
  3. Acetic anhydride
  4. Ethyl acetate
  1. The compound used in the manufacture of synthetic fiber is.
  1. Formic acid
  2. Acetic acid
  3. Oxalic acid
  4. Carbonic acid
  1. The solution of the acid used for seasoning of food is.
  1. Formic acid
  2. Acetic acid
  3. Benzoic acid
  4. Butanonic acid

SHORT QUESTIONS:

  • Write down structural formulae of pthalic acid and malonic acid.
  • Write down mechanism of reactions.  (a) Between acetic acid and ethanol  (b)   Acetic acid and thinoyl chloride
  • How would you convert acetic acid into methane and acetic anhydride.
  • What happens when followings are heated?

          a)       Sodium Format and Soda lime

          b)      Sodium acetate and soda lime

  •  Give four uses of acetic acid? 

CHAPTER NO. 15       COMMON CHEMICAL INDUSTRIES IN PAKISTAN.

SHORT QUESTIONS:

  • Distinguish micronutrients and macronutrients for plants.
  • Give reactions of preparation of urea by using NH3 and CO2.
  • Brief about periling of urea.
  • Write down formulas for superphosphate and triple phosphate?
  • Explain the importance of potassium fertilizer?
  • How urea is manufactured? Write its reactions.
  • What are phosphatic fertilizers? Give two formulas of phosphatic fertilizer.
  • Give an idea about clinker?
  • Define cement. Give its essential components.
  • Draw flow sheet diagram for the manufacture of cement?
  • Describe chemical changes that occur in the different zones during the manufacture of cement.
  • What do you mean by Calcareous materials and argillaceous material the manufacturing of cement?
  • What are clinkers? How are they converted into cement?
  • Write various types of raw material used in preparation of cement.
 

 




Share your comments questions here
Sort By: