Question # 1

Propyne on hydrolysis is presence of H₂SO₄and HgSO_{4 gives}

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Acetaldehyde

Acetone

Formaldehyde

None

Natural fertilizer provides potassium in the form of K₂O (potash)

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1.5 kg

3 kg

4.5 kg

6.5 kg

The pure crystalline substance on being heated gradually first forms 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

The acid used in lead storage cells is

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Phosphoric acid

Nitric acid

Sulphuric acid

Hydrochloric acid

Covalent compounds are soluble in

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Polar solvents

Non-polar solvents

Concentrated acids

All solvents

Bond angle is minimum for

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H₂O

H₂S

H₂Se

H₂Te

The substance used as a smoke screen in warfare is

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SiCl₄

PH₃

PCl₅

Acetylene

By using the fluted filter paper rate of filtration is

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Increased

Decreased

Filtration is constant

Having no effect

Reaction of acids with alcohols is also known as

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Esterification

Saponification

Alkalization

None

Sea weeds are important source of

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Iron

Chlorine

Iodine

Bromine

Which of the following compounds has the lowest anion to cation size ratio?

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LiF

NaF

Csl

CsF

Gooch Crucible used to filter the solution of

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H₂SO₄

HCI

KMnO₄

Both B & C

Isopropyl alcohol on oxidation forms

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Acetone

Ether

Ethylene

Acetaldehyde

Maximum number of active hydrogens

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Acetic acid

Glycerol

Methane

Methanol

The rate of reaction between A and B increases by a factor of 100, and when the concentration with respect to A is increased 10 folds, the order of reaction w.r.t. A is

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10

1

4

2

In cold countries ethylene glycol is added to water in radiators of cars during winter. It results in

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Lowering in b.pt.

Reducing viscity

Reducing specific heat

Lowering in freezing pt.

Atmosphere of big/metropolitan cities is polluted most by

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Automobile exhausts

Pesticide residue

Household waste

Radio-active fall out

Which of the following represents elements in order of increasing atomic size?

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I, Br, Cl

Na, Mg, C

C, N, O

Li, Na, K

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

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120° . 28'

60°

90°

109°

The reaction/method that does not give an alkane is

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Catalytic hydrogenation of alkanes

Wurtz reaction

Hydrolysis of alkyl magnesium bromide

Dehydrohalogenation of an alkyl halide.

Cyclone collector is used for minimizing

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Radioactive pollution

Air pollution

Noise pollution

Water pollution

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