Question # 1

The freezing point of 1 molal NaCI solution assuming NaCI to be 100% dissociated in water in

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-1.86°C

-3.72°C

+1.86°C

+3.72°C

Enzymes are

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Proteins

Mineral

Oils

Fatty acids

Gooch crucible is used for the filtration of precipitates having

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High solubility

High concentration

High ignition temperature

Low temperature

Tollen's reagent is

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Ammonical cuprous chloride

Ammonical cuprous oxide

Ammonical silver bromide

Ammonical silver nitrate

Which of the following fluorides of xenon in impossible?

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XeF₂

XeF₃

XeF₄

XeF₆

Which one is primary alcohol?

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Buten-2-oI

Propan-2-oI

Butane-1-oI

2,3-Dimethylhexane-4-oI

The rate of a reaction that does not involve gases does not depend upon

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Pressure

Temperature

Concentration

Catalyst

When sulphur is boiled with Na₂SO₃solution the compound formed is

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Sodium sulphides

Sodium sulphates

Sodium persulphate

Sodium thiosulphate

Reaction of ethylamine with chloroform in alcoholic KOH producers

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CH₃OH

CH₃NC

C₂H₅NC

C₂H₅CN

Propyne on hydrolysis in presence of H₂SO₄ and HgSO₄ gives

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Acetaldehyde

Actone

Formaldehyde

None

ΔH_{Neutralisation} is always

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Positive

Negative

Zero

Positive or negative

The wire in the flash bulbs is made up of

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Mg

Ba

Cu

Ag

Ethyl alcohol is industrially prepare from ethylene by

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Permanganate oxidation

Catalytic reduction

Absorbing in H₂SO₄followed by hydrolysis

Fermentation

Natural fertilizer provides phosphorus to plants in the form of P₂O₅

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1.2 kg

2.2 kg

3.2 kg

4 kg

Which of the following is a colligative property?

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Melting point

Osmotic pressure

Freezing point

Sublimation temperature

Which is true for an element R present in group 13 of the periodic table?

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It is a gas at room temperature

It has oxidation state of +4

It forms R₂O₃

It forms RX₂

Maximum number of active hydrogens

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Acetic acid

Glycerol

Methane

Methanol

During the folding of filter paper the apex form angle of about

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80°

60°

180°

90°

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 sulphur is boiled with Na₂SO₃solution, the compound formed is

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sodium sulphides

Sodiums sulphates

Sodium persulphate

Sodium thiosulphate

Hydrogen chloride molecule contains

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Covalent bond

Double bond

Co-ordinate bond

Electrovalent bond

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

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