Question # 1

Among alkali metal salts,the lithium salts are the poorest conductors of electricity in aqueous solution because of

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Easy diffusion of Li⁺ ions

Lower ability of Li⁺ ions to polarize water molecules

Lowest charge to radius ratio

Higher degree of hydration of Li⁺ ions.

The alkali metal which is liquid at 15°C is

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K

Cs

Na

None

Portland cement is manufactured by using

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Limestone,clay and sand

Limestone,gypsum and sand

Limestone,gypsum and alumina

Limestone,clay and gypsum

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

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80^o

60^o

180^o

90^o

Which of the following is not present in RNA?

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Uracil

Thymine

Ribose

Phosphate

Chile salt petre is

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NaNO₃

Na₂SO₄

KNO₃

Na₂S₂O₃

Pollutant of automobile exhausts that affects nervous system/produces mental diseases is

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Mercury

Lead

Nitrogen oxide

Sulphur oxide

Evaporation of water is

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An exothermic change

An endothermic change

A process where no heat changes occur

A process accompanied by chemical

The number of atoms in 0.0004 g of magnesium is close to

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24

2 x 10²⁰

10²⁰

6.02 x 10²³

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