Question # 1

Corrundam is ore of which element?

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Al

Th

In

Mg

A temperature at which two cyrstalline forms of a substances coexist in equilibrium is called

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standard temperature

critical temperature

transition temperature

absolute temperature

The law of distribution of energy is given by

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Clausius

Maxwell

Bernoulli

Boltzmann

Chloroform (CHCl3) is?

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Primary alkyl halide

Secondary alkyl halide

Tertiary alkyl halide

a liquid

Formation of Picric acid from phenol needs heating, one possible reason for it is

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acidity of phenol

e- donating nature of-OH

acidity of picric acid

e- with drawing effect of- NO2

Covalent bonds are least likely to be formed:

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between atoms of the same element

between atoms of different elements on the right of the periodic table

by head of the group elements with high ionization energies

between an element in Group I and an element in Group Vll

If there are weak intermolecular forces in a liquid, it will be

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more volatile

less volatile

more dense

less heavy

The most abundant protein in the human body is

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Collagen

Keratin

Myosin

Albumin

The relationship between density and molar mass of a gas is

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Directly proportional

^{Inversly proportional}

Straight line

Stoichiometric

For reaction of methane and chlorine light is not available then

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Reaction will take place rapidly

No Reaction take place

Reaction occurs at double the rate

May all cases occur

How many kinds of space lattices are possible in a crystal?

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23

7

230

14

Which of the following compound is least reactive

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HCHO

CH3CHO

CH3COCH3

C6H5CHO

Elements of group IV-A are

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neither strongly electropositive nor strongly electronegative

strongly electropositive

strongly electronegative

none of these

The electrical conductivity of the metals decreases with the increasing temperature. This is because

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the number of free electrons decrease

the bonds of the metal atoms become weak

the to and fro motion of the metal ions decrease

the increase of to and fro motion of the metal ions hinders the free movement of electrons

Anthracene contains number of fused benzene rings

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1

2

3

4

Kerosene is liquid at room temperature.This is due to:

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organic nature

H-bonding

molecular size

dipole-dipole forces

When a compressed gas is allowed to expand into a region of low pressure, it produce:

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Vapours

Cooling effect

Heating effect

None of above

If 1 mole of an ideal gas is heated from 273.15 K to 283.15 K at 1 atmospheric pressure, then increase in its energy is

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0.082 atm.dm³

0.821 atm.dm³

8.21 atm.dm³

40.6 kJ

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

For a particular halogen, the reactivity of alkyl halides

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remains same with C-increase

decreases with C-increase

increases with C-increase

decreases with C-decrease

NH₃shows maximum boiling among the hydrides of group V elements. The is due to:

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pyramidal structure of NH₃

H-bonding between its molecules

enhanced electronegative character

very small size of nitrogen

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 is not molecular crystal

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Sugar

Iodine

Ice

Graphite

The movement of gas molecules from a region of high pressure to vacuum is called:

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Evaporation

Effusion

Conduction

Diffusion

CO₂gas is dissolved in water due

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dipole-dipole interactions

higher molecular mass of CO₂

ion dipole attractive forces

hydrogen bonding

Partial pressure of gases in a mixture depend upon:

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Number of moles

Number of protons

Number of electrons

Number of neutrons

Sugar crystals belong to the system

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cubic

monoclinic

triclinic

orthorhombic

Butane has isomeric forms

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3

4

2

1

If the rate of the reaction is equal to the rate constant, the order of the reaction is

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3

1

0

2

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

If R, T, M, V and P are gas constant, temperature, molar mass, volume and pressure then density is given by:

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M/V

RT/M

PM/RT

V/M

Gases are effused through a whole due to ______ motion

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Vibration

Rotaional

Translational

Chaotic

The phenomenon in which sudden expansion of a gas causes cooling is called

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evaporation

cooling

Joule Thomson effect

sublimation

A line parallel to x-axis is obtained when graph is drawn between

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Volume on abscissa & pressure on ordinate

Volume on abscissa & PV on ordinate at all conditions

Pressure on abscissa & PV on ordinate at constant temperature

None of these

The elements for which the value of ionization energy is low can

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Gain electrons readily

Lose electron less readily

Gain electrons with difficulty

Lose electron readily

On the basis of intermolecular forces diamond is a

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ionic solid

covalent solid

metallic solid

molecular solid

Neutralization of acid-base is

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Spontaneous

Exothermic

Non spontaneous

Both "a" and "c

One dm3 of H2 and O2: has different masses but no. of particles are

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same

H2 has greater

different

O2 has greater

In gasses and liquid, temperature is the measure of:

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Average transnational kinetic energies of molecules.

Average vibrational kinetic energies of molecules.

Average rotational kinetic energies of molecules.

None of above.

When does average rate become equal to instantaneous rate of reaction

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At the start of reaction

time interval is zero

at the end of reactior

time interval approaches zero

Equal volumes of gases at the same temperature and pressure contain equal number of particles.This statement is direct consequence of

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Perfect gas law

Partial law of volumes

Charle's law

Ideal gas equation

The highest melting point is observed by

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Butanoic acid

Propanoic acid

Pentanoie acid

HCI

Tertiary alcohols are the easiest to dehydrate because

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They form stable carbocation

They have less hydrogen

They have bigger size

They are polar

Which compounds is alicyclic in nature?

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Cyclobutane

Iso-bstand

n-Butane

Toluend

The maximum hydrogen bonding is in:

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diethyl ether

ethanol

water

benzene

The specifie substance (metabolite) that fits on the enzyme surface and is converted to products is called

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Co-factor

Isoenzyme

Prosthetic group

Substrate

As gases can adopt the shape of the container so they have

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no fixed shapes

fixed shapes

different shapes

definite shapes

During esterifcation, the alcobol molecule acts as:

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Oxidizing agent

Electrophile

Reducing agent

Nucleophile

When we dissolve 15.8 g of KMnO4 in 1000g of H20. The solution is

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, 0.1 M

0.1 M

0.2 M

Which one of the following is not true of metallic bonding?

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it gives rise to excellent electrical conductivity

electrons are following to move throughout the structure

the strength of metallic bonds increases down a group

the strength of metallic bonding affects the boiling point of metals

Water has high boiling point which is due to

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weak dissociation

hydrogen bonding

high specific heat

high dielectric constant

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

At higher temperature what is true for gases

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pressure is decreased

volume is decreased

number of moles are decreased

KE is increased

Carboxylic acids reacts with sodium carbonate, & gas evolved in this reaction

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CO2

H2

CO

Both a &b

Which pair of molecules have debye force

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Ne and Ne

Argon and water

Na⁺ion and water

Water and water

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

Surface tension is measured by

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viscometer

barometer

stalagmometer

manometer

Graham s law refers to

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Boiling point of gases

Gas compression problems

Gaseous diffusion

Volume changes of gases due to change in temperature

NaCI is completely ionized in water due to the presence of:

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dipole-dipole forces

ion- dipole forces

H-bonding

London dispersimforces

Which of the following is not heterocyclic compound?

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Naphthalene

Furan

Pyridine

Pyrrole

When a compressed gas is allowed to pass through a nozzle of a jet into a region of low pressure, it produces

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cooling

vaporization

fusion

expansion