Mdcat Chemistry Tests-Chapter 22 Environmental Chemistry

Question # 1

Which product is formed by teh reaction of carboxylic acid with alcohol?

Aldehyde A
Ether B
Alkane C
Ester D

Question # 2

Butane molecule can have max no of isomers.

4 A
5 B
3 C
2 D

Question # 3

Which mechanism of reaction is shown by carbonyl compounds?

Nucleophilic addition A
Electrophilic substituion B
Free radical substitution C
Electrophilic addition D

Question # 4

Why is it necessary to distill aldehyde formed from oxidation of primary alcohol through acidified potassium dichromate (VI) solution or acidified sodium dichromate (VI) solution.

Aldehyde formed may be oxidised further to carboxylic and concerned A
Aldehyde formed may react with primary alcohol the original reactant B
Aldehyde formed may be oxidised further to a ketone C
Aldehyde formed is unstable and decomposed back to original precuser, ie. primary alcohol D

Question # 5

Which is the correct electronic configuration of chromium.

1s²,2s²,3s²,2p⁶,3p⁶,4s²,3d⁶ A
1s²,2s²,2p⁶,3s⁶,3p⁶,3d⁶ B
1s²,2s²,3s²,2p⁶,3p⁶,4s²,3d⁴ C
1s²,2s²,2p⁶,3s²,3p⁶,4s²,3d⁵ D

Question # 6

Halogen are being used as fire extinguisher, mild antiseptic, CFCs and many other organic chemicals. Which of the following halogen is used to kill the bacteria in drinking water.

Bromine A
Fluorine B
Chlorine C
Iodine D

Question # 7

Which option shows all the molecule with bond angle 109.5^o.

CH_4,CCl₄,NH₃ A
CH₄,NH₄ PH₃ B
SiCl₄ H₂O BeCl₂ C
SiCl₄ Nh₄CH₄ D

Question # 8

The dilute solution of ___________ is called vinegar.

Formic acid A
Acetic acid B
Oxalic acid C
Benzoic acid D

Question # 9

Which one of the following enthalpy change ins always exothermic?

Enthalpy of atomization A
Enthalpy of combustion B
Enthalpy of solution C
Enthalpy of formation D

Question # 10

Down the group acid base behavior of metallic oxides of group 2 elements changes to .

More basic A
No change B
Less basic C
More acidic D

Question # 11

In period 1 and period 3 maximum melting point shown by elements.

Nitrogen and phosphorous A
Carbon and silicon B
Lithium and sodium C
Neon and argan D

Question # 12

While finding the relative atomic mass, which of the following standard is used to compare the atomic mass of chlorine .

Carbon-12 A
Neon -20 B
Carbon -13 C
Nucleon number D

Question # 13

The standard electrode potential of hydrogen is arbitrarily taken at 298 K is

1.00 volt A
0.00 volt B
10.0 volt C
0.10 volt D

Question # 14

Which of the following acts as a electrocphile in the electrphilic substitution of benzene.with bromine.?

Fe^-3 A
Br- B
FeCl^4- C
Fe⁺² D

Question # 15

The potential difference of an electrochemical cell is measured by

Calorimeter A
Voltmeter B
Galvanometer C
Ammeter D

Question # 16

Gas is enclosed in a container of 20 cm3 with the moving piston. According to kinetic theory of gases, what will be the effect on freely moving molecules of the gas if temperature is increased from 20 ^oC in 100 ^oC?

Volume will be increased A
Decrease rate of a reaction B
Decrease yield of a reaction C
Increase yield of product D

Question # 17

Percentage of nitrogen by volume in air is

20% A
78% B
98% C
50% D

Question # 18

According to Lowry-bronsted acid and bass concept, H2O is

A salt A
An acid B
A base C
An amphoteric species D

Question # 19

Which is the structure of polyvinyl chloride?

[H2C=CH-Cl] A
-[HCCl-CH-Cl]- B
-[H2C-CH-Cl]- C
-[CCl2-CCl2]- D

Question # 20

Relation of water with quick lime result in the rise in the temperature of the system using the concept of energy change, indicate the nature of the reaction?

Endothermic reaction A
Third order reaction B
Exothermic reaction C
Non spontaneous reaction D

Question # 21

The shape of [Co(NH₃)₆]³⁺ complex is.

Linear A
Octahedral B
T
Tetrahedral C
Square planer D

Question # 22

Which of the following molecule has largest number of shared pair of electrons?

CO₂ A
N₂ B
NH₃ C
C₂H₄ D

Question # 23

The species which are produced by electrolytic bond breaking and can act as electron pair donors are known as.

Cations A
Anions B
Nucleophiles C
Free radical D

Question # 24

3.0 mole of calcium will contained________ g of calcium.

100 gm A
105 gm B
80 gm C
120 gm D

Question # 25

Which of these pollutants is produced by burning of coal and causes acid rain

SO2 A
CO2 B
CO C
NO D

Question # 26

Halogen is a halo derivative of

Ethanol A
Methane B
Methanol C
Ethane D

Question # 27

Which compound is obtained by the elimination of bromopropane?

Propene A
Ethene B
Propane C
Butane D

Question # 28

Reaction mechanism of alkanes with halogens is known as

Propagation A
Additon B
Elimination C
Free radical substitution D

Question # 29

Alcohol in which carbon atom bonded to OH group is further attached with three alkyl group is

Aromatic alcohol A
Tertiary alcohol B
Primary alcohol C
Secondary alcohol D

Question # 30

Which of following compound is solid and room temperature?

Ethanal A
Phenol B
Butane C
Methanol D

Question # 31

Which of the following would react with ozone in the atmosphere?

F A
Cl B
O2 C
O D

Question # 32

Electron affinity of the atom is the energy released when

electron is removed from gaseous atom A
Covalent bond of molecule is broken B
Electron is added to gaseous atom C
Covalent bond is formed between the atom D

Question # 33

Which of the following reagents is used to distinguish between aldehydes and ketones.?

2,4 NDPH A
Bromine B
Alkaline Iodine C
Tollen's reagent D

Question # 34

The catalyst used for the manufacture of H2SO4 by contact process is with bromine?

SO3 A
Pt/pd B
V2O5 C
Fe2O3 D

Question # 35

Nylon -6,6 also called

Polyvinyl alcohol A
Polystyren B
Polyamide C
Polyester D

Question # 36

Which of the following acts as a nucleophile in the reaction of alkyl halide with alcoholic aqueous ammonia?

NH3 A
H+ B
Br- C
NO2- D

Question # 37

Nitrogen is present in air as a major constituent it is an inactive gas in comparison with oxygen which is the next major constituent of air Nonreactive nature of nitrogen is due to the reason.

There is one lone pair of electron on each nitrogen atom in its molecule A
Nitrogen have three unpaired electron i its 2p orbital which is comparatively stable elecrtonic configuration B
There is a triple covalent bond in nitrogen molecule which in very strong and molecule is polar C
There is a triple covalent bond in nitrogen molecule which is very strong and molecule is non polar D

Question # 38

The essential property of a fertilizer is that it should be.

Partially soluble A
Highly soluble B
In soluble C
Immiscible D

Question # 39

Liquid in the container have temperature 70 C. What will be the temperature in Kelvin Scale?

203 K A
350 K B
343 K C
300 K D

Question # 40

What is teh order of increasing reactivity of alkyl halides?

Iodoalkane <bromoalkane<chloroalkane<Fluoroalkane A
Fluoroalkane<Chloroalkane<Bromoalkane<Iodoalkane B
Iodoalkane<Bromoalkane<Chloroalkane<Fluoroalkane C
Fluroalkane<Chloroalakane< Bromo alkane<Iodo alkane D

Question # 41

Which one the following is the structure of Teflon?

(-CH2-CH2-)n A
(-CF2-CH2-)n B
(-CF2-CF2-)n C
(-CF2-CCl2-)n D

Question # 42

Alcohol in which carbon atom bonded to OH group is further attached with three alkyl group is .

Aromatic alcohol A
Tertiary alcohol B
Primary Alcohol C
Secondary Alcohol D

Question # 43

Which one will be act as a strong acid.

Dichloroethanoic acid A
Emanoic acid B
Chloroethanoic acid C
Trichlorothanoic acid D

Question # 44

Which one of the following compounds is known as tertiary alcohol?

1-Propanol A
2-methyl-1 propanol B
2-propanol C
2-methyl-2-propanol D

Question # 45

Which compound will be produced by the oxidation of ethanol by acidified K2Cr2O7?

Ethanone A
Ethene B
Ethanoic acid C
Ethanol D

Question # 46

Which one of the following compounds act as catalyst when alcohols react with carboxylic acids.

Pt A
Conc. H2SO5 B
Conc HNO3 C
Ni D

Question # 47

Select one which is alcohol

CH3-CH2-OH A
CH3COOH B
CH3-O-CH3 C
CH3-CH2-Br D

Question # 48

Ligands having two lone pair of electrons for donation to the central transition metal ion are known as.

Bidentate ligands A
Hexadentate ligands B
Polydentate ligands C
Monodentate ligands D

Sr.#	Question	Answer
1	Nitrogen is present in air as a major constituent it is an inactive gas in comparison with oxygen which is the next major constituent of air Nonreactive nature of nitrogen is due to the reason.	A. There is one lone pair of electron on each nitrogen atom in its molecule B. Nitrogen have three unpaired electron i its 2p orbital which is comparatively stable elecrtonic configuration C. There is a triple covalent bond in nitrogen molecule which in very strong and molecule is polar D. There is a triple covalent bond in nitrogen molecule which is very strong and molecule is non polar
2	Halogen are being used as fire extinguisher, mild antiseptic, CFCs and many other organic chemicals. Which of the following halogen is used to kill the bacteria in drinking water.	A. Bromine B. Fluorine C. Chlorine D. Iodine
3	Which of following compound is solid and room temperature?	A. Ethanal B. Phenol C. Butane D. Methanol
4	The standard electrode potential of hydrogen is arbitrarily taken at 298 K is	A. 1.00 volt B. 0.00 volt C. 10.0 volt D. 0.10 volt
5	Which one of the following compounds is known as tertiary alcohol?	A. 1-Propanol B. 2-methyl-1 propanol C. 2-propanol D. 2-methyl-2-propanol
6	Ligands having two lone pair of electrons for donation to the central transition metal ion are known as.	A. Bidentate ligands B. Hexadentate ligands C. Polydentate ligands D. Monodentate ligands
7	Which one of the following enthalpy change ins always exothermic?	A. Enthalpy of atomization B. Enthalpy of combustion C. Enthalpy of solution D. Enthalpy of formation
8	Which of these pollutants is produced by burning of coal and causes acid rain	A. SO2 B. CO2 C. CO D. NO
9	Which is the structure of polyvinyl chloride?	A. [H2C=CH-Cl] B. -[HCCl-CH-Cl]- C. -[H2C-CH-Cl]- D. -[CCl2-CCl2]-
10	Which one will be act as a strong acid.	A. Dichloroethanoic acid B. Emanoic acid C. Chloroethanoic acid D. Trichlorothanoic acid

Latest Educational News Stories

Pakistan's Largest Database of Colleges and Universities

BS Programs

University Past Papers

University Results

Exam Results 2024

Study Abroad Programs and Opportunities for Pakistani Students

MDCAT Chemistry Chapter 22 Preparation Online Test for Pakistani Students

MCQ's Test For MDCAT Chemistry Chapter 22 Online Test

MDCAT Chemistry Chapter 22 Online Test