Question # 1

Which of the following belongs to the halogen family?

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Francium

Polonium

Radium

Astatine

Bleaching action of bleaching powder is due to the liberation of

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O₂

OCI^-

CI₂

CI^-

The ratio of close packed atoms to tetrahedral holes in cubic close packing is

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1 : 1

1 : 2

1 : 3

2 : 1

Which of the following statement is correct if the intermolecular forces in liquids A, B and C are in the order A < B < C?

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B evaporates more readily than A

B evaporates less readily than C

A and B evaporates at the same rate

A evaporates more readily than C

For the reaction

2A(g) + B(g) 3C(g) + D(g)

two moles each of A and B were taken into a flask The following must always be true when the system attained equilibrium

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[A] = [B]

[A] < [B]

[B] = [C]

[A] > [B]

Ethyl chloride on treatment with aqueous alkali gives

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Ethane

Ethene

Ethanal

Ethanol

Causticisation process is used for the preparation of

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Caustic soda

Caustic potash

Baryata solution

Slaked lime

Which one of the following has the lowest boiling point?

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B

AI

Ga

Ti

The formula of nitre is

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KNO₃

NaNO₃

NaCI

Na₂CO₃

An exothermic reaction is one in which the reacting substances

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Have more energy than the products

Have less energy than the products

Have the same energy as the products

Are at a higher temperature than the products

Cannizzaro reaction is not given by

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Trimethyl acetaldehyde

Acetaldehyde

Benzaldehyde

Formaldehyde

Wt. of 112 ml of oxygen at NTP on liquification would be

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0.32 g

0.64 g

0.16 g

0.96 g

Octane number is zero for

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n-Heptane

Isooctane

n-Hexane

Isoheptane

Hess's law deals with

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Changes in heat or reaction

Rate of reaction

Equilibrium constant

Influence of pressure on volume of a gas.

Bell metal is an alloy of

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Cu, Zn and Sn

Cu, Zn and Ni

Cu and Zn

Cu and Sn

With increasing principle quantum number, the energy difference between adjacent energy levels in H atom

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Decreases

Increases

Remain constant

Decreses for low value of Z and increases for higher value of Z.

Which is the most volatile compound?

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HI

HCl

HBr

HF

The rate of a reaction that does not involves gases, does not depend upon

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Pressure

Temperature

Concentration

Catalyst

Ionic solids with defects, contain

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Equal number of cation and anion vacancies

Interstitial anions and anion vacancies

Cation vacancies only

Cation vacancies and interstitial cations

Phenol is heated with CCl₄and alkaline KOH when salicylic acid is produced. The reaction is known as

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Frledel-Craft reaction

Riemer-Tiemann's reaction

Rosenmund's reaction

Sommelet reaction

Which one of the following elements occurs free in nature?

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N

P

As

Sb

The structure of XeF6

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Distorted octahedral

Pyramidal

Tetrahedral

None of the above

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