Question # 1

Which one is not related with evaporation

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Continuous

Cooling

Exothermic

Spontaneous

lonic solids are characterized by which one of the following properties

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moderately low pressure

high vapour pressure

good conductivity in solid state

solubility in polar solvents

NaCI has face centered cubic structure. The Na ion at the face of the unit cell is shared by

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2-unit cells

4-units cells

only one unit cell

8-unit cells

Which of the following is the simplest form of matter?

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Gaseous state

Liquid state

Solid state

All of above

Glass is a

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Micro-crystalline solid

Super-cooled liquid

Gel

Polymeric mixture

If temperature is 73K and volume is 146 cm3 then calculate the value of K=V/T

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5

4

3

2

Which compounds is alicyclic in nature?

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Cyclobutane

Iso-bstand

n-Butane

Toluend

An ideal gas cannot be liquefied because:

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It solidify before becoming a liquid

Its critical temperature is always above 0^oC

It is molecule are relatively smaller in size.

Forces operative between its molecules are negligible

The original volume of a gas at 0° is 273 cm³at constant pressure, its volume at 273°C becomes

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zero cm³

546 cm³

446 cm³

346 cm³

What is the formula of cryolite?

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Al2O3.2H2O

Na2B4O7 .10 H2O

Na3AIF6

Ca2B6O11. 5H2O

Which of these has at least one d electron

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Sc+3

Mn+7

Ti+4

Cr+3

Anthracene contains number of fused benzene rings

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1

2

3

4

pH of an aqueous solution is 3.0 at 25°C. The hydrogen ion concentration in the solution would be

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0.001

0.01

0.0001

10(-5)

Which of the following govern the diffusion of gases

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Dalton's law

Avogadro's law

Graham's law

Newton's law

The nature of crystal of diamond is

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metallic

molecular

covalent

ionic

Which of the following is exact relationship between °F and C°

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°F= 5/9[°C-32]

°C = 5/9 [°F]+32

°F = 9/5°C+32

All

In aldehydes and ketones carbon of carbonyl group is;

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sp³ hyhridized

sp² hybridized

sp hybridized

un hybridized

The kinetic energy of 4 moles of nitrogen gas at 127°C is? cals.(R = 2 cal mol^-1 K^-1)

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4400

3200

4800

1524

Total number of valence electrons in phosphonium ion (PH4-) is

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8

9

12

10

Gram atoms of hydrogen in 5.5 g H2

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5.50

2.25

5.45

2.20

A mixture of H₂, H2 and CH₄has total number of 0.51 mole and total pressure of 1 atmosphere. If the mass of H₂is 0.8 gram, then its partial pressure is

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0.4 atm

0.6 atm

0.776 atm

0.667 atm

The system in which two out of three axes are of equal length and angles are all 90°

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cubic system

hexagonal system

trigonal system

tetragonal system

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

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6X(5)

36X(5)

64X(5)

108X(5)

R = 0.08205:

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atm dm³mol^-1k^-1

J mole^-1k^-1

Nm mol^-1k^-1

cal. mol^-1k^-1

One dm³of O₂at STP has mass

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32 g

16 g

4.438 g

1.4383 g

Enthalpy of a reaction can be measured by

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Glass calorimeter

Barometer

Manometer

Thermometer

Under which condition CO has the maximum molar volume

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high T and P

Low T and High p

high T and low P

Low T and low P

Which attractive forces cause molecular solids to be formed?

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lonic

Metallic

Covalent

van der Waals

Covalent solids are composed of

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Ions

Different molecules

Neutral atoms

Diethyl ether

The sun is a ball of plasma heated by nuclear fusion is

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1.0 million km

2.0 million km

1.5 million km

2.5 million km

If absolute temperature of a gas is doubled and the pressure is reduced to one half, the volume of the gas will:

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reduced to 1/4

be double

increases four times

remains unchanged

At equilibrium, the concentration of reactants and products are

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Constant

Maximum

Different

Equal

Steam causes more seers burns than boiling water. It is due to

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Latent heat of fusion

Latent heat of vaporization

Latent heat of sublimation

All of above

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 typical range of the H-bonding is:

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1-2 kj/mol of bonds

5-25 kj/mol of bonds

500 kj/mol of bonds

What is the formula of silica?

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Si2O3

SiO2

Si3O4

SiO-

In a period the atomic radii

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increase

decrease

remain same

first increase, then decreased

The boiling points of the halogens

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increases down the group

decreases down the group

remains constant

can not be predicted

In voltaic cell a saht bridge is used in order to

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Pass the electric current

Prevent the flow of ions

Mix solutions of two half cells

Allow movement of' ions between two cells

Which alkaline earth metal makes peroxide?

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Ba

Be

Mg

Ca

When 1-butene reacts with bromine, the product formed will be

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1, 3-dihydroxy butane

But-1, 2-diol

1, 3-dihydroxy butan-diol

1,2-dibromo butane

Increased concentration of enzyme alkaline phosphatase is a sign of

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hemophilia

heart disease

thrombosis

rickets

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

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Methyl alcohol

Acetaldehyde

Ethyl alcohol

Acetone

Lonic solids are characterized by:

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low melting points

_{good conductivety in solid state}

high vapour pressures

solubility in polar solvents

Li resembles with Mg, because

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the ratio of their charge to size is nearly the same

both have nearly same size

both are metallic in nature

both are found together in nature

Which of the following undergoes easy dehydration?

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3-MethyIbutan-2-ol

Ethanol

2.Methylpropan-2-ol

Methanol

The radioactive disintegration of 238U92 is

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First order

Second order

Third order

Zero order

The relationship between density and molar mass of a gas is

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Directly proportional

^{Inversly proportional}

Straight line

Stoichiometric

Which pair of the gases doesn't obey Dalton's Law of partial pressures

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H₂and O₂

N₂and O₂

H₂S and H₂

NH₃and HCl

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 has positive value of enthalpy

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Neutralisation

Atomization

combustion

All of the above

Mercury does not wet the glass because of

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repulsion

weak cohesive force

high viscosity

capillary action

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

Which of the following is pseudosolid?

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CaF₂

Glass

NaCl

All

The crystal of diamond is

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ionic

molecular

covalent

metallic

The volume of given mass of gas is directly proportional to absolute temperature when pressure is kept constant this is called

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Boyle's law

Charles's law

Graham's law

Dalton's law

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

1 gram molecule refers to amount in grams

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Equivalent to 1 mole of an atom

Equivalent to 1 mole of a molecule

Equivalent to 1 mole of an ionic species

Of an ionic compound

Which thermometer will have its reading 273 degrees greater than that of thermometer C?

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A

B

B has 273 degrees greater than A

C has greater reading than all other thermometers

The pi-electrons in the styrene are

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13

10

8

6

The nature of l₂crystals are

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Metallic

Covalent

Ionic

Molecular