Question # 1

The products of electrolysis of which of the followings are known

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Fused electrolyte

Aqueous solution of eleetrolyte

Solid electrolyte

Solid metal

Amorphous solids:

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have sharp melting point

undergo clean cleavage when cut with knife

have prefect arrangement of atoms

can possesses small regions of orderly arrangement

Which of the following formula is correct for density of any gas

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d = RT/PM

d = PM/RT

d = MT/PR

d = RM/PT

Which of the following is not a property of crystalline solid

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geometric shape

cleavage plane

anisotropy

isomerism

What types of bonds are broken when water turns into steam on heating?

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covalent

permanent dipole interactions

hydrogen bonds

induced dipole interactions

A gas has non-ideal behaviour at:

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high temperature and high pressure

low temperature and low pressure

high temperature and low pressure

low temperature and low pressure

Which is a good nucleophile as well as a good leaving group?

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F-

Cl-

Br-

I-

Stalagmometer is used to measure

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the resistance to flow of a liquid

capillary action of a liquid

Meniscus of the liquid

surface tension of the liquid

Compared with alkaline earth metals, the alkali metals exhibit.

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lower ionization energies

greater hardness

high boiling point

smaller ionic radii

Hydration of ethene is an example of

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Electrophilic addition

Electrophilic substitution

Nucleophilic addition

Nucleophilic substitution

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

Which compound is obtained hy the elimination reaction on bromoethane?

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Butene

Ethene

Propene

Propane

NH₃can form only one hydrogen bond per molecule though it has three partially positively charged hydrogens

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nitrogen in NH₃has only one ions pair of electrons which can make one H-bond

ammonia is a base

ammonia is a weak acid

it ionizes to give one H⁺

The ratio of volume to temperature on Kelvin scale is constant according to:

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Charle's law

Newton's law

Coulomb's law

Boyle's law

Compound X & Y give effervesce with Na2CO3, solution. X gives a white ppt with ammonical AgNO3 while Y gives sweet smell compound on heating with alcohol X &Y are

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Formic acid & acetic acid

Acetone & formic acid

Acetaldehy de & acetic acid

Acetic acid & acetone

For gas obeying Boyle's law if pressure is double, the volume becomes:

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Remains constant.

Double.

One half.

None of above.

Which one is correct about conjugate acid-base concept?

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Conjugate base of a very weak acid is relatively very strong

Conjugate base of a very weak acid is relatively very weak

Conjugate base of a very strong acid is relatively very weak

Both A and C

If an endothermic reaction is allowed to take place very rapidly in air, the temperature of the surrounding air will

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Remains constant

Increase

Decrease

Either increase or decrease

One Joule is equivalent to

Which of the following undergoes easy dehydration?

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3-MethyIbutan-2-ol

Ethanol

2.Methylpropan-2-ol

Methanol

Coordination number of Zn and ZnS (Zinc blends) is

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4

6

2

None of these

The potential of SHE is taken as zero which is avalue

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Reference

Arbitrary

Exact

Experimental

Stronger the oxidizing agent, higher is

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Redox potential

Standard reduction potential

Reduction potential

_{Oxidation potemial}

When purely alcoholic solution of sodium/potassiumhydroxide and halogenoalkanes are reacted an alkene is formed, what is the mechanism of reaction?

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Elimination

Debromination

Dehydration

Reduction

If rate of diffusion of A is 5 times that of B,what will be the density ratio of A and B?

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1/25

1/5

25

5

In NaCl cyrstal Na⁺ion is surrounded by how many ions of Cl^-

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4

6

8

10

What are the conditions under which the relation between volume (V) and number of moles (n) of gas is plotted? (Pressure; T-temperature)

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constant P and T

constant P and V

constant T and V

constant n and v

2,5-dimethyl-1-hexene has

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Two sp2 hybridized carbons

Six sp2 hybrid carbons

Two double bonds

Four pi electrons

When two ice cubes are pressed together they unite to form one cube. Which of the following forces is responsibles for holding them together

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Van der Waal's

covalent bonding

hydrogen bonding

dipole-dipole interaction

Vapour pressure of a substance does not depend upon:

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physical state of matter

temperature

intermolecular forces

surface area

NH₃gas is liquefied more easily than N₂Hence

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Van der Waals constants a and b of NH₃> that of N₂

Van der Waals constants a and b of NH₃< that of N₂

a(NH₃) > a (N₂) but b (NH₃) < b(N₂)

a (NH₃) < a (N₂) but b (NH₃) > b (N₂)

General gas equation is combination of

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Boyle s law

Avogadro s law

Charles s law

All of these

The pi-electrons in the styrene are

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13

10

8

6

Crystal lattice with alternate +ve and -ve ions has radius ratio of 0.524.Its coordination number is

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4

3

6

12

Enthalpy of neutralization of strong acids and strong bases have same values because

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Neutralization leads to the formation of salt and water

Acids always give rise to H+ and bases always furnish OH-

Strong acids and bases are ionic substances

The net change involves the combination of H and OH ions to form water

In the reaction A+B→ Products, if B is taken in excess, then it is an example of

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Second order reaction

zero order reaction

Pseudo first order reaction

first order reaction

The rate of reaction for a reaction is 30 mol dm-3sec-1 if the product of concentration of 10.reactant is unity the specific rate constant is

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25

2.5

30

15

The best concentration unit used for K⁺ ions present in potable water is

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ppm

Mole fraction

Molarity

Molality

The red brown ppt. of Fehling solution and benedict solution tests are of

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Ag

Cu2O

CuO

AgBr

The graph between pressure and volume at constant temperature for gas is:

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Isobaric

Isothermal

Isotherm

None of above

which one of the following exhibits intermolecular hydrogen bonding?

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HF

HC

HBr

HI

According to Boyle's law at constant temperature, the product of pressure and volume of a given mass of gas is:

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a constant

fraction

whole number

a multiple

In the reaction A2 (g) + 4B2 (g) <-----------> 2AB4 (g) such that ∆H < 0, the formation of AB4(g) will be favoured at

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Low temperature and high pressure

Low temperature and low pressure

High temperature and low pressure

High temperature and high pressure

The partial pressure of CH₄and O₂are 500 torr and 100 torr repectively in a 10 dm³vessel at 0°C. The ratio of number of molecules of CH₄: O₂is

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1: 2

5 : 1

5 : 2

2 : 1

The radioactive disintegration of 238U92 is

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First order

Second order

Third order

Zero order

At ordinary temperature, the most nearly ideal gases are

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N₂

He

H₂

all these

Which property of liquid is measured by polarimeter

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Conductance

Optical activity

Refractiye Indéx

Change in volume

All gases liquefly before reaching at

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273°K

373°K

0 K

73°C

Ionic solids are characterized by

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low melting points

good conductivity in solid state

high vapour pressure

solubility in polar solvents

Which of the following is not a postulate of the kinetic theory of gases?

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when gas particles collide, their total kinetic energy increases

gases consist of molecules in a constant state of random motion

when gas particles collide their total kinetic energy does not change at all

The gas particles travel in straight lines unit they collide with one another or with the walls of the container

The deviation of a gas from ideal behaviour is maximum at

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-10°C and 5.0 atm

100°C and 2.0 atm

-10°C and 2.0 atm

0°C and 2.0 atm

Ionic solids with defects,contain

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Equal number of cation and anion vacancies

Interstitial anions and anion vacanies

Cation vacancies only

Cation vacancies and interstitial cations

The number of molecules in one dm³of water is close to:

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6.02/22.4 x10²³

12.04/22.4 x10²³

18/22.4x 10²³

55.6x6.02x10²³

What is true for a molecule with standard geometry

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It lacks a Ip

It can't be a donor

It can be an acceptor

All

The Kw. of water at 25 C° is given by

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10(-7)

10(-10)

10(-12)

10(-14)

Which of the following gases have maximum root mean square velocity at 25°C:

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SO₂

NH₃

CO₂

H₂S

A graph between P and 1/V at constant temperature and number of moles of a gas meets the:

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Y-axis

X-axis

Origin

None of above

Which of the following statement is not true?

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The pressure of a gas is due to collision of the gas molecules with the walls of the container.

The molecular velocity of any gas is proportional to the square root of the absolute temperature.

The rate of diffusion of a gas is directly proportional to the density of the gas at constant pressure.

Kinetic energy of an ideal gas is directly proportional to the absolute temperature.

Intermolecular forces exist between molecules of group 7 elements which of the following sequence represents the strength of the intermolecular forces?

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Cl₂> Br₂> I₂

Br₂> Cl₂> I₂

Cl₂> Br₂> I₂

I₂> Br₂> Cl₂

In the esterification, first attack is due toon carborylic acid

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Hydrogen ion

Alcohols

Water

All

Which one of the following statements is wrong for gases?

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gases do not have a definite shape and volume

volume of the gas is equal to volume of container confining the gas

confirmed gas exerts uniform pressure on the walls of its container in which it is enclosed

mass of gas cannot be determined by weighing a container in which it is enclosed

The most unsymmetrical one in crystal system is

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triclinic

Li, Na, K

monoclinic

hexagonal