Question # 1

Hydrogen chloride molecule contains

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Covalent bond

Double bond

Co-ordinate bond

Electrovalent bond

Aluminothermy used for on the spot welding of large iron structure is based upon the fact that

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As compared to iron, aluminium has greater affinity for oxygen

As compared to aluminium, iron has greater affinity for oxygen

Refraction between aluminium and oxygen is endothermic

Reaction between iron and oxygen is endothermic.

When electrons revolve in stationary orbits,

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There is no change in energy level

They vecome stationary

They are gaining kinetic energy

There is increase in energy

What happens when isotonic solution of a (mol. wt. 342) and B (mol. wt 60) are put in to communication through semiperme-able membrane?

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Transference of solvent from solution A to that of B take place

Transference of solvent from solution B to that of A takes place

No transference of solvent from solution A to that of B takes place

Change in temperature of solutions takes place.

The most reactive compound for electrophilic nitration will be

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Benzyl chloride

Benzoic acid

Nitrobenzene

Chlorobenzene

Which of the following is acidic?

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SO₃

N₂O

BeO

HgO

As a fixing agent in photography, sodium thisoulphate is used for

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Dissolving out unreacted silver bromide

Converting silver halides to metallic silver

Reducing solubility of AgBr

Preventing overdeveloping and fogging.

The total pressure exerted by a number of non-reacting gases is equal to the sum of partial pressure of the gases under the same conditions is known as

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Boyle's law

Charle's law

Avogadro's law

Dalton's law

For preparing an alkane, a concentrated aqueous solution of sodium or potassium salt of saturated carboxylic acid is subjected to

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Hydrolysis

Oxidation

Hydrogenation

Electrolysis

Which inorganic precipitate acts as semipermeabale membrane?

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Calcium sulphate

Barium oxalate

Nickel phosphate

Copper ferrocyanide

If a salt bridge is removed electrode is made from which of the following?

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ZnCl₂

CuSO₄

Hg₂Cl₂

HgCl₂

White P when boiled with strong solution of caustic soda produces

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Phosphine

Posh acid

Phosphorous acid

None

Which reaction sequence would be best to prepare 3-chloro-aniline from benzene?

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Chlorination, nitration, reduction

Nitration, Chlorination, reduction

Nitration, reduction, chlorination

Nitration, reduction, acylation, chorination, hydrolysis

The relative rates of diffusion of a gas (molecular weight = 128) as compared to oxygen is

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2 times

1/4

1/8

1/2

Bleaching action of bleaching powder is due to the liberation of

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O₂

OCl^-

Cl₂

Cl^-

Galena is an ore of

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Gallium

Lead

Tin

Germanium

The bond angle H-O-H in ice is closest to

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120° . 28'

60°

90°

109°

Which of the following belongs to the halogen family?

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Francium

Polonium

Radium

Astatine

All the naturally occurring processes proceed spontaneously in a direction which lead to

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Decrease of entropy

Increase of enthalpy

Increase of free energy

Decrease of free energy

The alkali metal which is liquid at 15°C is

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K

Cs

Na

None

For the carbylamine reaction we need hot alc. KOH and

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Any amin and chloroform

Chloroform and Ag powder

A primary amine and chloroform

A mono alkyl amine and trichlorom-ethane

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