Question # 1

Diamond and silicon carbide are insoluble in all solvents because

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they have high melting and boiling points

absence of three electrons

they are huge giant three dimensional molecules (macromolecules)

their unit cells have tetrahedral geometry

Bond will be covalent when electronegativity difference of bonded atom is

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Equal to 1.7

between 0.5 to l.7

Greater to 1.7

zero

The oxidation of SO2 to SO3 is exothermic reaction. The yield of SO3 will be maximum if

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Temperature is increased and pressure is kept constant

Temperature is reduced and pressure is increased

Both temperature and pressure are increased

Correct order for the reactivity ofalkyl halide in S, reactions

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R-I>R-F>R-CI

R-F>R-CI>R-I

R-I>R-CI>R-F

R-CI>R-I>R-F

Atoms having same mass number but different atomic numbers are called.

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Isotopes

isobars

Isotones

isomers

By increasing pressure two times and decreasing temp. two times the volume of gas

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Volume increases 4 times

Volume decreases 4 times

Volume increases 2 times

Volume decreases 2 times

An ideal gas, obeying Kinetic theory of gases cannot be liquified, because

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its critical temperature is above 0°C

its molecules are relatively small in size

It solidifies before becoming a liquid

Forces acting between its molecules are negligible

The temperature of the gas is raised from 27°C to 927°C the root mean square velocity is

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√927/27 times the earlier value

Same as before

Halved

Doubled

An element that is not an essential par of proteins is

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O

N

H

S

Ice floats on water because

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the hydrogen bonding in ice is stronger than that of in water

empty spaces are left in ice

ice has two-dimensional structure

the bond length of the oxygen and hydrogen bond is different in water and ice

ln ethyl alcohol, the bond that undergoes heterolytic cleavage most readily is

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C-C

C-O

C-H

O-H

which one pair has the same oxidation state of-Fe?

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FeSO4 and FeCl4

FeCl4and FeCl3

FeSO4 and FeCl2

Fe2(SO4)3 and FeSO4

Which of the following liquid has higher boiling point?

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HCl

HBr

H₂O

Br₂

The formation of ester from acetic aciad in presence of acid and ethanol is a

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Nucleophilic substitution reaction

Nucleophilic addition reaction

Electrophilic substituion reaction

Electrophilic addition reaction

How temperature affects the electrical conductivity of metals?

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Does not change at all

Decreases with increasing temperature

Increases with increasing temperature

Decreases with decreasing temperature

In elimination reaction i.e, in the formation of alkene, the reactivity of alkyl halide is in the order:

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CI>Br>I

I>Br>Cl

Br>CI>I

I>CI> Br

The transition temperature of KNO3, is

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13.2°C

95.5°C

128°C

32.02°C

Acetone and chloroform are soluble in each other due to:

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intermolecular hydrogen bonding

dipole-dipole interaction

instantaneous dipoles

all of the above

Which property is associated with ionic solids?

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Solubility in polar solvents

Low melting points

Good conductivity in solid state

High vapour pressure

Choose the example having hexagonal system:

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graphite

sugar

sulphur

diamond

Mass spectrometry is used to determine the

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Number of isotopes of an element

Relative abundance of isotopes

Relative isotopic masses

All of these

Naturally occurring isotopes of silver are

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,Two

, Four

, Forty seven

, sixteen

Water has high boiling point which is due to:

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high electric constant

weak dissociation

high specific heat

H-bonding between its molecules

Aniline is the derivative of the benzene containing the

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Hydroxyl group

Amino group

Amido group

Imido group

The element which exhibits maximum catenation property is

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C

Pb

Ge

Sn

Benzene cannot undergo the ------- directly

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Substitution reaction

Addition reaction

Oxidation reaction

Elimination reaction

Ionic solids are characterized by

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low melting points

good conductivity in solid state

high vapour pressure

solubility in polar solvents

In an elimination reaction a more substituted alkene is formed due to the stability associated with

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Free radical

transition state

Activated complex

Carbocation

Which compounds is alicyclic in nature?

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Cyclobutane

Iso-bstand

n-Butane

Toluend

[Ti (H20)6]3+ ion isin colour.

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Yellow

Blue

Violet

Red

SHE acts as anode when connected with Cu electrode but act as cathode with Zn electrode

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Zn has less reduction potential than hydrogen and Cu

Zn has high reductionl potential than hydrogen

and Cu

Zn is below electrochemical series than hydrogen and Cu

Zn has least tendency to lose electron

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 relative rates of diffusion of a gas (Mol.wt.=98) as compared to hydrogen will be

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1/7

1/5

1/4

1

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

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Crystal

Unit

Cleavage

None

The forces present between the ions and water molecules are called:

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dipole-dipole forces

dipole-induced dipole forces

London dispersion forces

ion-dipole forces

The conversion of molecules of A to B follows a second order kineties. Doubling the concentration of A will inerease the rate of formation of B by a factor of

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2

4

1/2

1/4

All the following have crystals except:

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potassium bromide

diamond

cadmium sulphide

sodium chloride

Ionic crystals are brittle because

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they have cubic geometry

they are bad conductors of electricity

coordination number of cations and anions is same

cations and anions are arranged in alternate positions in layers

The value of oxidation number of chlorine in HCIOs is

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+7

+5

-1

+3

Highest oxidation state af the transition elements is

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+8

+7

+5

+1

If internal energy of the system is increased

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Change in state of the system may occur

Temperature of the system may rise

Chemical reaction may take place

All of these

In which molecule. all atoms are coplanar?

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CH4

BF3

NH3

PH3

Enzymes are

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simple proteins

derived proteins

compound proteins

conjugated proteins

Liquids are less common than solids and gases because

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They exist in narrow range of temperature and pressure

They have definite volume

Liquid molecules can slide past each other

Molecules contain three type of motion

CH3CH2CH2OH--------A---------B Here B is

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Propyne

Propanal

Propene

Propane

Most of the reactions which give stable products are

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Endothermic

Exothermic

Isothermal

Non of these

In the esterification, first attack is due toon carborylic acid

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Hydrogen ion

Alcohols

Water

All

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

Which of the following compound shows the geometrical isomerism

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2-butene

2-butyne

2-butanol

Butanol

The cell which converts electrical energy to chemical energy is called

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Electrochemical cell

Voltaic cell

Galvanic cell

Down's cell

Haemoglobin molecule is how many times heavier than helium atom

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68000 times

17000 times

,34000 times

, 1700 times

The value of critical temperature of a gas depends upon its:

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Size

Intermolecular forces in it

Shape

All of above

The general electronic configuration of group IV-A elements is

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ns2, np6

ns2, np4

ns2, np3

ns2, np2

Liquid hydrocarbon is

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methane

propane

ethane

hexane

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

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

Number of electrons involved in d-d transition of [Ti(H2O)6]+3

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1

3

2

4

Reaction kinetics is important to discover the---under which reaction will proceed most economically:

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rate constant

Conditions

volume

equilibrium point

Methyl cyanide, on boiling with mineral acids yield

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Acetic acid

Formic acid

Propanoie acid

Butanoic acid

In SO-²4 the oxidation number of sulphur is

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-8

-6

+8

+6

According to Boyles law, at constant temperature the product of pressure and volume of a given mass of gas is

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whole number

a constant

fraction

a multiple