Question # 1

Which of the following fluorides does not exist?

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NF₅

PF₅

AsF₅

SbF₅

At room temperature formaldehyde is

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Gas

Liquid

Solid

None of the above

If a salt bridge is removed between the two half cells the voltage

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Drops to zero

Does not change

Increases gradually

Increases rapidly

Which of the following is not present in RNA?

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Uracil

Thymine

Ribose

Phosphate

The pore size of the filter paper depends upon

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Nature of the medium

Temperature of the medium

Size of the particles

Mass of the particles

One mole of a gas refers to

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The number of molecules in one litre of gas

The number of molecules in one gram of gas

The number of molecules contained in 12 grams of ¹²C isotope

The number of molecules in 22.4 liters of a gas at S.T.P.

The addition of HBr is easiest with

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CH2 = CHCI

CICH = CHCI

CH3 - CH = CH2

(CH3)2 C = CH2

Setting of plaster of paris involves

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Oxidation with atmospheric oxygen

Combination with atmosphere CO₂

Dehydration

Hydration to yield another hydrate.

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

ΔH_{Neutralisation} is always

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Positive

Negative

Zero

Positive or negative

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