Question # 1

The recombination of O and O₂ in mid stratosphere is an

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Exothermic reaction

Endothermic reaction

Heat absorbing process

None of these

Percentage of methane present in natural gas is.

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75%

80%

85%

90%

When bones are heated they give.

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Starch

Gelatin

Fats

Oils

General formula of carbohydrate is.

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C_n(H₂O)₆

CH

C_nH_2n

C₆H_2nO

How many % age of urea is used as fertilizers?

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80%

90%

95%

98%

Temporary hardness in water can he removed by.

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Boiling Method

Using washing soda

Using sodium zeolite

All of them

Water has a maximum density at 4 ^oC

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12 cm^-3

2 g cm^-3

1 g cm^-3

4 gcm^-3

The rate of reverse reaction in the beginning.

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Slow

moderate

Very fast

Low

The reactions in which products can recombine to form reactants is called.

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Irreversible reactions

Reversible reactions

Direct reactions

Indirect reactions

Which one of the following statements is not correct about active mass?

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Rate of reaction is directly proportional to activ emass.

Active mass is taken in molar concentration

Active mass is represented by square brackets

Active mass means total mass of substances.

White viscous fluid present in an egg is.

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Proten

Fats

Vitamin

Carbohydrates.

pH of neutral solution is always.

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6

5

7

10

Which element do not causes toxicity in water?

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Lead

Arsenic

Sodium

Mercury

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