Question # 1

Process of heating the concentrated ore to high temperature in excess of air is called.

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Roasting

Smelting

Bessemerization

All

Temporary hardness can be removed by__________.

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Quick lime

Slaked lime

Lime stone

HCl

The region of ozone decomposition in stratosphere is.

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20 km

30 km

40 km

50 km

Formic acid is present in

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String of bees

Sour milk

Apple

Fats

Natural source of citric acid is:

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Rancid butter

Fats

Lemon

Sour milk

Which one of the following disease causes severe diarrhea and can be fatal:

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Jaundic

Dysentery

Cholera

Typhoid

Halogenation of methane on the presence of diffused sunlight takes place.

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Only in one step

Slowly in one step

Freshly in two steps

In a series of four steps

Which process is responsible for ascending of water in roots:

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evaporation

transpiration

condensation

capillary action

Sodium zeolite is resin of:

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NaAl(SiO₃)₂

KAl(SiO₃)₂

LiAl(SiO₃)₂

RbAl(SiO₃)₂

Carbon black is used in the manufacture of.

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Dry cleaning

Shoe polishes.

Fertilizer

None of these

Manufacturing of urea involves:

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2 steps

3 steps

4 steps

5 steps

The two major components of atmosphere are:

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Hydrogen and oxygen

Nitrogen and Hydrogen

Nitrogen and oxygen

Oxygen and water.

Dehalogenation of tetrahalides produces acetylene. This reaction takes place in the presence of

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Sodium metal

Zinc metal

Magnesium metal

Potassium metal

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