Question # 1

Which one of the following statements is wrong for gases?

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gases do not have a definite shape and volume

volume of the gas is equal to volume of container confining the gas

confirmed gas exerts uniform pressure on the walls of its container in which it is enclosed

mass of gas cannot be determined by weighing a container in which it is enclosed

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

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

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

The attracted forces which are created due to repulsion of electronic cloud of the molecules are:

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ion-dipole forces

dipole-dipole forces

dipoles-induced dipole forces

instantaneous dipole-induced dipole

The hydrocarbon with maximum B.P is

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CH4

C6H14

C4H10

C2H6

The number of NaCI molecules in unit cell of its crystal is

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2

4

6

8

Which compounds is alicyclic in nature?

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Cyclobutane

Iso-bstand

n-Butane

Toluend

The active group of glutathione is

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Amino group

Sulfhydryl group

Carboxylic group

Imino group

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

Which of the following is pure substance

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Distilled water

, Sea water

, NaCl (aq)

Brass

The term cryoscopy is used for

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Depression of freezing point

Elevation in boiling poing

Lowering of vapour pressure

Osmotic pressure

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e/m of cathode rays is same but for positive rays e/m changes by changing gas in the discharge tube because

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Cathode rays are small sized particles

Cathode rays have same charge

Nature of cathode rays same for all gasses, but masses of nuclei are different for different gases

Temperature of cathode rays higher

What is the nature of SO₂

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Basic

Strongly acidic

Weakly acidic

Amphoteric

Internal energy of a system is equal to

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Kinetic energy of particles

Potential energy due to binding forces between particles

Sum of kinetic energy plus potential energy of the particles

Heat contents

N₂ + O₂ ⇌2NO

The unit of K_c for tis reaction will be:

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No unit

mol^-2 dm^-3

mol^-1 dm^-3

mol^-2 dm⁺³

Self linkage of carbon to produce long chains

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isomerism

Polymorphism

Polymerization

Catenation

Which one of the following gases is used for artificial ripening of fruits

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Ethene

Ethane

Methane

Propane

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4-methyl pentene

2-methyle-1-butene

2-methyl propane

None of the above

In a Galvanic cell

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Chemical energy is converted into electricity

Chemical energy is converted into heat

Electrical energy is converted into heat

Electrical energy is converted into chemical energy

Smallest charge of electricity that has been measured so far is

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Charge on a-rays

Charge on electron (1.602 x 10^-19C)

Charge on x-rays

Charge on gamma rays

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