Question # 1

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

There are _________ types of solids

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1

2

3

4

For an ideal gas,number of moles per litre in terms of its pressure P,gas constant R and temperature T is

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PT/R

PRT

P/RT

RT/P

The gecko a small lizard can up a smooth glass window the gecko has millions of microscopic hairs on its toes and each hair has thousand of pads at its tip the result is that the molecules in the pad are extremely close to the glass surface on which the gecko is climbing.

What is the attraction between the gecko is climbing.

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co-ordinate bonds

covalent bonds

ionic bonds

van der Waals forces

Metals are good conductor of electricity, but their conductivity decreases by increase in temperature because

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electrons attracted strongly by the nuclei which resists their free motion

atoms form ionic bond and no free electrons

electrons go to the iocalized orbital not free

positive metal ions begin to oscillate and their motion hinders the free movement of electrons

Which one of the following gases has lowest density at room temperature:

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NH₃

Ne

N₂

CO

What is the formula of magnesite?

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PbS

MgSO4. 7H2O

MgCO3

CaCO3

Consider the following reaction
R-CHO + 2Ag(NH3)2OH + R-COONH+ +2Ag+2NH3+H2OThis reaction represents

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Fehling test

Ninhydrin test

Benedict lest

Tollen's test

The ideal gas law holds best under the conditions of

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high pressure and high temperature

low pressure and high temperature

low pressure and low temperature

high pressure and low temperature

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

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Hydrolysis

Oxidation

Reduction

Redox

Benzene has pi electron

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2

4

6

8

The boiling of water may be 120°C, when the external pressure is

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greater than 760 torr

less than 760 torr

equal to 760 torr

variable

Low IE is a symbol of

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high electronegativity

small size

High electron affinity

Metallic character

Which of the following may be called as London dispersion forces?

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instantaneous dipole-induced dipole forces

dipole-dipole forces

ion-dipole forces

dipole-dipole forces

Enzymes are

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simple proteins

derived proteins

compound proteins

conjugated proteins

Propanone does not undergo

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Oxime formation

Reduction of Fehling solution

Hydrazone formation with hydrazine

Reaction with HCN

Electrons in 5d energy level are filled up in case of

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Lanthanides

Transition metals

Actinides

Rare gases

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

The hydrocarbon with maximum B.P is

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CH4

C6H14

C4H10

C2H6

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

Saturated hydrocarbons having carbon atoms more than 20 in a molecule are solids due to

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higher densities

higher molar masses

the chain, are more zig-zag

all are correct

Which pair of elements have bonds of the same type between their molecules in the solid state?

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phosphorous and nitrogen

sulphur and magnesium

carbon and sodium

hydrogen and sodium

Which group activates the benzene ring

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-COOH

-COR

-CHO

-OH

Acording to the kinetic theory of gases

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The pressure exerted by a gas is proportional to mean square velocity of the molecules

The pressure exerted by the gas is proportional to the root mean square velocity of the molecules

The root mean square velocity is inversely proportional to the temperature

The mean translational KE of the molecule is directly proportional to the absolute temperature

The structure normally associated with ionic bonding is:

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a giant lattice

a simple molecule

a giant molecule

a regular arrangement of ions surrounded by a sea , or cloud, of electrons

To prepare ethane by Wurtz synthesis the suitable alkyl halide is

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Ethyl iodide

any alkyl iodide

Ethyl chloride

Methyl bromide

The measurement of enthalpy change at standard conditions means that we should manage the measurement at

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24°C at 1 atm

25°C at 1 atm

0C° at 1 atm

100C° 1 atm

Which of the following alcohol cannot be produced by treatment of aldehydes or ketones with NaBH4

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I-propanol

2-Methyl-2-propanol

2-propanol

Ethanol

which one of the following statements bout negative ions is incorrect?

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they are also know as anions

they are formed when atoms gain electrons

they are large than the atom from which they were formed

they are smaller than the atom from which they were formed

The volume of gas depends upon the------- moleules

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Size of

Space between

Molecular weight

both a and b

When HCI gas is passed through saturated solution of rock salt, the solubility of NaCl

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Increases

May increase or decrease

Decreases

None of these

London forces are

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stronger than dipole-dipole interactions

weaker than dipole-dipole interactions

equal to dipole-dipole interactions

sometimes stronger and sometimes weaker than dipole-dipole interactions

Substance that does not show the process of sublimation is

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K2Cr2O7

iodine

naphthalene

NH4CI

Which one of the following has zero dipole moment

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NH3

CHCI3

H2O

BF3

The lattice energy of NaCl is

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787 j/ mole

790 kj/mol

780 kJ/ mol

-787 kI / mole

The pure crystalline substance on being heated gradually first forms a turbid liquid at constant temperature and still at higher temperature turbidity completely disapp-ears.The behaviour is a characteristic of substance forming

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Allotropic crystal

Liquid crystals

Isomeric crystals

Isomorphous crystals

Acetaldehyde cyanohydrin upon hydrolysis prodnces

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Tartaric acid

Malonic acid

Formic acid

Lactic acid

The scale of temperature that shows the freezing point of water at 0° is called

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Fahrenheit

Kelvin

absolute

Celsius

Neutralization of acid-base is

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Spontaneous

Exothermic

Non spontaneous

Both "a" and "c

Enzymes have been classified on the basis of

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protein structure

prosthetic groups

type of reaction they catalyse

bonding in them

The acidity of phenol is due to its

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Nature of Benzene

Double bond in benzene ring

Natute of phenoxide ion

Hydroxyl group

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

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rate constant

Conditions

volume

equilibrium point

The number of unpaired electrons present in Fe ions is

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1

2

5

0

Unit of the rate constant depends upon the

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Molecularity of reaction

Order of reaction

Concentration terms

Number of reactants

All gases can be compressed by:

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Keeping constant pressure

Decreasing pressure

Increasing pressure

None of above

The value of Kc for H2O at 25C° is

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1x10 (-14)mole dm-3

14 mol dm-3

1.86×10(-16) mol dm-3

1.0x10 (-7)moldm-3

The amount of heat absorbed when one mole of a liquid is changed into vapours at its boiling point is called

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Heat of sublimation

Heat of vaporization

Heat of fusion

Enthalpy change

The increase in reaction rate as a result of increase in temperature from 10K to 90K is

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512

256

400

112

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

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4

6

8

10

Joule is a unit of energy which is defied as

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Kgm^-2s^-2

Kgm²s^-1

Kgms^-2

Kgm²s^-2

D-block elements are also called

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Non-typical transition element

Outer transition elements

Abnormal transition elements

Inner transition

Which is an intermediate in SN1 reaction

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Ethoxide ion

Carbocation

alkyl halide

alkene

If a salt bridge is removed from two half cells the emf is

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Increased

Decreased

Dropped to zero

Electrodes will be reversed

The enzymes that bring about exchange of functional groups like phosphate are called

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Ligases

Lyases

Isomerases

Transferases

The relationship between density and molar mass of a gas is

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Directly proportional

^{Inversly proportional}

Straight line

Stoichiometric

Which of the following is not the application of plasma

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Fluorescent light bulb

Removal of hazardous chemical

Neon signs

Corrosion effective

The actual volume of gas molecules is considered negligible at following pressures

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2atm

4atm

6 atm

8 atm

Which one of the following is not an alicyclic compound?

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Cyclohexene

Cyclohexane

Benzene

Cyclopentane

Which order of vapour pressure in the following liquids is correct

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water > ethanol > acetone > ether

ether > acetone > ethanol > water

ether > ethanol > acetone > water

water > ether > acetone > ethanol

Which is the least reactive of all the alkali metals

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Li

Na

K

Cs

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