Question # 1

Conversion of dead plants into coal by the action of bacteria and heat is called.

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Carbonization

Catenation

Hydrogenation

Cracking

Which acid is used for etching designs on copper plates?

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H₂SO₄

HNO₃

HCl

CH₃COOH

Dichloromethane reacts with halogens in the presence of diffused sun light and produces

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Carbon tetrachloride

Chloroform

Chloromethane

No reaction

Mesophere extend forms 50 km to:

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50 km

12 km

60 km

85 km

In smelting process a small amount of coke is required because:

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it is highly endothermic process

it is highly exothermic process

it is very fast process

it is very slow process

Which one contains double covalent bound?

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Pentane

Ethylene

Acetylene

All

Temporary hardness is removed by adding.

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Quick lime

Slaked lime

Lime stone

Lime water.

Which diseases cause by the deficiency of vitamin E?

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Rickets

Anemia in babies

Scurvy

Night blindness

Guldberg and waage put forward law of mass action in:

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1860

1869

1870

1879

Which type of reactions do not go to completion?

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Irreversible reaction

Reversible reactions

Addition reactions

Decomposition reactions

Ammonia is prepared by:

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Solvay's process

Haber's process

Floatation process

Bayer's process

Ethylene is present is natural gas sometimes to the extent of .

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10%

20%

30%

40%

Earth has natural systems.

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One

Two

Three

Four

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