Question # 1

Liquids evaporate at every temperature. When the temperature becomes constant for a liquid, then:

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rate of evaporation is greater than the rate of condensation

the rate of condensation is greater than the rate of evaporation

The rate of condensation and evaporation become equal

it depends upon the nature of the liquid

Which alcohol is most reactive towards sodium metal?

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Ter Butyl alcohol

n-Propyl alcolol

Isopropyl alcohol

Have same reactivity

If the concentration of salt is greater than the acid in buffer solution, then the

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pH = pKa

pH = pKb

pH > pKa

pH < pKb

One mole of a gas refers to

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The number of molecules in one litre of gas

The number of molecules in one gram of gas

The number of molecules contained in 12 grams of ¹²C isotope

The number of molecules in 22.4 liters of a gas at S.T.P.

Compressibility factor for an ideal gas is

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1.5

1.0

2.0

0.5

Hydrogen bonding is involved in

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Solubility

Detergents

Biological molecules

All the above

H-bonding is maximum in:

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ethanol

benzene

diethyl ether

water

Glucose is converted into ethanol by the enzyme present in the yeast

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Urease

Zymase

Invertase

Sucrase

Which of the following statements is false?

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Avogadro number = 6.02 x 10²¹

The relationship between average velocity (v) and root mean square velocity (u) is v = 0.9213 u

The mean kinetic energy of an ideal gas is independent of the pressure of the gas

The root mean square velocity of the gas can be calculated by the formula (3RT/M)^1/2

A pressure of 1Nm^-2 is equal to:

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one bar

one pascal

stalagmometer

one aomosphere

Evaporation occurs at all temperatures and is effected by

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surface area

temperature

intermolecular forces

all of these

250cm of 0.2 molar potassium sulphate solution is mixed with 250cm of 0.2 molar KCI solution. The molar concentration of K ions is:

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0.2 molar

0.25 molar

0.3 molar

0.35 molar

London dispersion forces are the only force present among the:

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molecules of water in liquid state

atoms of helium in gaseous state at high temperature

molecules of solid iodine

molecules of hydrogen chloride gas

Which type of motion is exhibited by gases?

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Vibrational

Transitional

Rotational

All of them

Which of the following gas will have lowest rate of diffusion

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CH₄

N₂

NH₃

CO₂

Keeping in view different factors which affect the melting point of a substance.the compound having melting point among the following is:

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LiCl

NaCl

CsCl

RbCl

Which of the following pair has the same no. of electrons in d- subshell

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Sc+3,Ti+3

Mn+2,Fe+3

Ti+3,V+3

Cr+3.Co+2

During sudden expansion of a gas energy is needed to overcome the intermolecular:

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Vibrations

Attractions

Repulsions

All of above

The total number of lattice arrangements in different crystal system is

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7.0

3.0

8.0

14

The reason that diamond and graphite have different physical properties is

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density

color

bonding

hardness

The surface formed by the breakage of a crystal is called _____ plane

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Crystal

Unit

Cleavage

None

Which one of the following is more acidic

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Phenol

Carboxylic acid

Alcohols

Amines

For N2: +3H2<--------> 2NH3, if Kc is 1 than value of Kp at 273K would be

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1/22.414

1/(22.414)2

22.414

11.207

The solubility of A2B3 is X mole dm-3. Its Ksp is?

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6X(5)

36X(5)

64X(5)

108X(5)

The process of effusion is best understood by law

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Grahams

Boyle s

Charles s

Avogadro s

One molecule of gas is approximately Distance______ times its own diameter from its neighbour at room temperature.

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30

3000

3

300

Esterification of CH3COOH isreaction

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Acid base

Electrophilic

Redox

Nucleophilic

When water freezes at 0°C, its density decreases due to

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cubic structure of ice

empty spaces present in the structure of ice

change of bond lengths

change of bond angles

The reaction between Cu and conc. H2SO4 produces

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Cu+2

SO₂

SO₃

H₂

The cause of deviation form ideal behaviour is because

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the actual volume of gas molecules is not negligible

there is force of attraction between molecules of a gas

both a and b

none of these

Rise in vapour pressure of water from 30 to 60°C is only 32 torr to 149.4 torr (117.4 torr) but from 60 to 90°C is 149.4 to 527.8 torr (378.4 torr).it is due to

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change in geometry of H₂O molecules at higher temperature

decrease in volume takes place at higher temperature

vapour pressure of liquids increases rapidly closer to their boiling points

boiling starts

The enzyme which is found in saliva, accelerates the conversion of starch into sugar is

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Pepsin

Thrombin

Ptyalin

Fumarase

The isomerism in which the compounds differ with respect to functional group but have same molecular formula is called

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Metamerism

Functional group isomerism

Position isomerism

Chain isomerism

The alcohol that does not form curbonyl compound on oxidation

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iso-butyl alcohol

neo pentyl alcohol

Ethanol

ter-butyl alcohol

The oxidation of 1 - propanol in the presence of H2SO4, +K2Cr207 produces final product

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Acetaldehyde

Propanal

Acetone

Propanoic acic

Elastic collision involves:

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gain of energy

loss of energy

no relationship between elastic

no gain or loss of energy

An ideal gas expands according to PV=constant. On expansion, the temperature of gas

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will rise

will drop

cannot be determined because the exteral pressure is not known

will remain same

Which one of the followings is resistant to oxidation under normal conditions

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Methyl alcohol

Acetaldehyde

Ethyl alcohol

Acetone

2-propanol on Oxidation gives

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Aldehyde

Carboxylic Acid

Ketone

Alcohol

Which of the following gives positive haloform test and positive Fehling solution

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Acetone

Echanol

Acetaldehyde

Formaldehyde

What is true about an alcohol and phenol

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Both are more acidic than water

Both react with NaOH

Both produce CO2 with Na2CO3

Both, produce H2 with Na

Which of the following least resembles an ideal gas?

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ammonia

helium

hydrogen

trichloromethane

Cl₂is a gas while iodine is a solid due to

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stronger London forces with high polarizability

greater electro negativity of Cl than iodine

stronger dipole dipole forces

iodine is colored while chlorine is colourless

Out of monochloro, monobromo and mongiodo derivatives of ethane, the mos reactive compound towards nucleophilic substitution will be

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C2H5Br

C2H5Cl

C2H5I

All are equally reactive

Which of the following statement about graphite is not true?

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The coordination number of carbon atoms is 4.

the carbon atoms are arranged layers.

the layers in graphite are attracted to each other weak forces.

the corbon atoms use only three of their four outer electrons for covalent bonding.

The process in which solid is directly coverted into gaseous state is called

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evaporation

boiling

sublimation

transformation

Areal gas obeying Van der Waal's equation will resemble ideal gas ilf the:

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both a and b are large

both a and b are small

a is small and b is large

a is large and b is small

The compound used to distinguish the ethyne and ethene is

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Alkaline KMnO4

Ammonical AgNO3

Bromine water

Tollen's Reagent

H₂O is liquid at room temperature whereas H₂S is a gas because

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H₂O used as drinking water, but H₂S has rotten egg smell

H₂O is neutral. H₂S is a weak acid

stronger hydrogen bonding in H₂O than in H₂S

H₂O occurs abundantly than H₂S

Diffusion of different species is due to difference of

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potential energy

temperature

density

all the above

One of the following metals is the most reactive and form super oxide. Indicate that

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Mg

K

Be

Li

Stronger the oxidizing agent, higher is

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Redox potential

Standard reduction potential

Reduction potential

_{Oxidation potemial}

In a crystal the atoms are locate at the position of:

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infinite potential energy

minimum potential energy

Zero potential energy

maximum potential

Which pair of elements will have the same type of bonds between their atoms in the solid state?

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carbon and calcium

lithium and boron

aluminium and phosphorus

nitrogen and carbon

Amorphous substance show

(i) Short and long range order

(ii) Short range order

(iii) Long range order

(iv) Have no sharp melting point

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(i) and (ii) are correct

(ii) and (iv) are correct

(ii) (iii) and (iv) are correct

(i) and (iv) are correct

The lattice energy of NaCl is

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787 j/ mole

790 kj/mol

780 kJ/ mol

-787 kI / mole

Which element differs from rest of elements of its group?

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Ba

Mg

Ca

Be

Which set of elements is good loser of electrons

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F2. Cl2, Br2

N, P. As

O. S, Se

Li, Na, K

Which of the following is more reactive where 0-H bonds break

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P°alcohol

T° alcohol

S°alcohol

Cannot be predicated

Glucose and fructose are isomers

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Chain isomers

Position isomers

Functional group isomers

Metamers

The boiling point of Kr is higher (-152.23°C) than that of helium (-268.6°C) due to

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Kr forms greater number of covalent bonds

greater polarizability of Kr than He

Kr has lowest freezing point

Kr is in liquid state at ordinary temperature