Question # 1

Catalyst used for ammonia synthesis is

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Cu

Co

Zn

Fe

The B.P. of compound is mostly raised by

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dipole-induced dipole interactions

london dispersion forces

intramolecular H-bonding

intermolecular H-bonding

In a period the atomic radii

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increase

decrease

remain same

first increase, then decreased

SiO₂ is an example of:

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metallic crystals

lonic crystals

a crystal whose structure depending upon the temperature

covalent crystals

Beryllium differs from other elements of group Il-A due to

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high charge density

comparatively high nuclear charge

small radius

all above

A compound that has a nucleophilic carbon?

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C2H2

C2H4

C3H8

C6H6

A gas is heated in such a way that its volume and absolute temperature both are doubled. the pressure of gas:

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Becomes 4 time

Becomes half

Becomes 2 time

Remains same

Gases exert pressure on walls of container because the gas molecules:

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Obey gas laws.

Have definite volume.

Collide with the walls of container.

Collide with each other.

If a strip of Cu metal is placed in a solution of FeSO4

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Cu will be deposited

Cu and Fe both dissolve

Fe is precipitated out

No reaction take place

Which one of the followings has polar covalent bonds hut is overall nom-polar molecule:

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HF

CO₂

CH₄

N₂

The exothermic process is

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Evaporation

Sublimation

Respiration

Boiling

The forces which are present between the ions and the water molecules are known as

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dipole-induced dipole forces

dipole-dipole forces

ion-dipole forces

London dispersion forces

The number of moles of CO2 which contain 16g of oxygen

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0.25

1.00

1.50

0.50

Which of the following is electrophile for alkylation?

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NO+2

SO3

R+

Both a & b

Ethanoic acid reacts with PCI5, to give ethanoyl chloride. HCI and a third compound What is the third compound

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H3PO3,

POCI3

SO2

COCl2

Which is not true in case of an ideal gas?

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It cannot be converted into a liquid

There is no interaction between the molecules

All molecules of the gas move with same speed

At a given temperature P'V is proportional to the amount of the gas

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

Which of the following is an example of diffusion?

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Spreading of smell of flowers in garden

Steam condensing on a cold window

Bubbles rising in a beaker of boiling water

All of above

What is the pressure of 2 mole of NH₃ at 27°C when its volume is 5 lit.in Van der Waals equation?(a = 0,17,b = 0.03711)

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10.33 atm

9.333 atm

9.74 atm

9.2 atm

The minimum temperature recorded by Kelvin scale is:

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273K

373K

Absolute scale is unable

0K to record this temperature

Which equation among the following is applicable to an ideal gas equation?

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P = nRT

P = MRT

P = dPRT/M

V = dRT/M

Which of the following statements about amorphous solids is incorrect?

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They melt over a range of temperature

They are anisotropic

There is no orderly arrangement of particles

They are rigid and icompressible

Rusting of iron metal Fe occurs when Fe gets converted into Fe2O3 What happen with Fe?

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F'e is neutralized

Fe is sublimed

Fe is reduced

Fe is oxidized

Plastics are amorphous solids and

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have sharp melting points

undergo clean cleavage when cut with knife

do not undergo clean cleavage

possess orderly arrangement over long distances

The average bond energy of C-Br is

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228 kJmol-1

250 kJmol-1

200 kJmol-1

290 kJmol-1

The hydrocarbon with maximum B.P is

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CH4

C6H14

C4H10

C2H6

Which of the following may be called London dispersion forces

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dipole-dipole forces

ion-dipole forces

dipole-induced dipole forces

instantaneous dipole-induced dipole forces

Rusting of iron is the example of

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Fast

Slow

moderate

depends upon conditions

If a = b = c and x = y = z 90° then crystal structure is

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Cubic

Tetragonal

Orthorhombic

Triclinic

If the energy of the activated complex lies close to energy of reactants, it means that reaction is

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Slow

Exothermic

Endothermic

Exothermic and fast

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

Choose the correct equation among the following given by clauslus to understand to behaviour of molecules:

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PV =nRT

C_r.m.s= √3RT/M

d = PM/RT

PV = 1/3mnc^-2

Density of H₂gas at 0°C is 0.09 under 1 atmospheric pressure. The density of O₂gas under the same conditions of temperature and pressure is

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0.36

1.00

1.44

1.18

Simplest Structure of a protein that has only covalent bonding between amino acids is

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2° structure

3°structure

1° structure

4° structure

Succinic thiokinase is an enzyme of the type

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mutase

peroxidase

ligase

lyase

Which class of compound cannot show positional isomerism?

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Alkanes

Alkene

Alkynes

Alcohol

Temperature required for the dehydration of ethanol into ethene in the presence of HaSOu is

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130°C

170°C

175°C

180°C

Phenol is completely soluble in water above

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25°C

62.3℃

68.5°C

66.50°c

Which af the following compound reacts slower than benzene in the electrophilic substitution.

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Phenol

Nitrobenzene

Toluene

Aniline

Which of the following is a pseudo solid?

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CaF₂

glass

NaCl

all these

Which if the following will have the same number of molecules at S.T.P?

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280cm³ of CO₂ and 280cm³ of N₂O

11.2dm³ of O₂and 32g of O₂

44g of CO₂and 11.2dm³ of CO

28g of N₂and 5.6dm³ of oxygen

The geometry of diamonds is

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tetragonal

cubic

rhombohedral

none of these

choose the temperature among the following at which real gas obeys ideal gas laws when pressure range is appreciable:

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critical temperature

boyle's temperature

inversion temperature

transition temperature

The value of oxidation number of chlorine in HCIOs is

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+7

+5

-1

+3

Mg(s) + 2HCI(aq). ------------ MgCl2(aq)+ H2(g)

Given that; Mg=21g and HCI=21g, the excess reactant is

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Mg

HCI

Both are in stoichiometric amounts

None of these

London dispersion forces are also called

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Ion-dipole forces

Dipole-induced dipole forces

Dipole-dipole forces

Instantaneous dipole induced dipole forces

Which of the following metal oxides is antiferromanetic in nature?

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MnO₂

TiO₂

NO₂

CrO₂

The compound that reacts the slowest in Lucas test

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1-Pentanol

sec-butyl alcohol

3-Pentanol

ter- butyl alcoho

The boiling point of glycerin at 1 atmospheric pressure is:

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290°C

390°C

190C°

210°C

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

Gases deviate from ideal behaviour at high pressure.Which of the following is correct for non-ideality?

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at high pressure the gas molecules move in one direction only

at high pressure the collisions between the gas molecules are increased manifold

a high pressure the volume of the gas become insignificant

at high pressure, the intermolecular attraction becomes significant

The reaction which is responsible for the production of electricity in the voltaic cell is

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Hydrolysis

Oxidation

Reduction

Redox

Which is trigonal crystal

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CaSO₄. 2H²O

MgSO₄

NaNO₃

All

Which of the following statement about the order of reaction is true?

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The order of reaction can only be determined by experiment

a second order reaction is also bimolecular

The order of reaction is always non-zero

The order of reaction increases with increasing temperature

Enzymes are

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simple proteins

derived proteins

compound proteins

conjugated proteins

The gases suddenly if these are allowed to expand:

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react

cool down

heat up

moved randomly

How many electrons have to be removed to ionize 1.0 x 10(-6) moles of Ne atoms to Ne+ ions in a neon advertising tube:

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6.02x10ê23/1.0x10ê-6

1.0x 10ê-6 x 6.02x 10ê23

1.0x10ê-6 x 6.02×10ê23/20.2

1.0x10ê-6 x 6.02x10ê23/9.65x10ê-1

Highest oxidation state af the transition elements is

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+8

+7

+5

+1

Some substance are good conductors of electricity in both the solid and liquid states. These substance are generally:

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molecular solids

ionic substances

metallic substances

covalent network solids

Which of the following does not give yellow precipitate with I2+ NaOH

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Acetone

Benzaldehyde

Acetildehyde

Acetophenone

pH of 10-4 mole dm-3 of HCl

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2

4

3

5