Question # 1

Salt makes the water permanently hard.

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CaSO₄

Ca(HCO₃)₂

NaHCO₃

NaCO₃

Freezing point of water is:

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-4°C

0°C

-36°C

-58°C

Which element protects teeth from decay?

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Potassium

Fluorine

Sodium

Calcium

soap is the sodium salt of long chain.

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Amino acids

Fatty acids

Nucleotides

None of them

Fertilizers are used to make up the deficiency of;

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oxygen and carbon

iron and magnesium

nitrogen and phosphorus

hydrogen and calcium

Rapid growth of algae in water bodies in because of detergent having.

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Carbonat salt

Sulphonic acid

Sulphat salt

Phosphate salt

Cholera is caused by

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Protozoa

Virus

Bacteria

Fungi

Inland water includes.

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River

Lakes

Streams

All of them

Rapid growth of algae in water bodies is because of detergent having.

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Carbonate salts.

Sulphonic acid salts.

Sulphate salts.

Phosphate salts.

Which disease is caused by polluted water.

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Cholera

Typhoid

Diarrhea

All of them

The boiling point of water is.

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100^oC

4^oC

0^oC

25^oC

The removal of Mg⁺² and Ca⁺² Ion which are responsible for the hardness of water is called.

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Temporary hardness

Permanent hardness

Water softening

Hydrogen bonding

Specific Heat capacity of water is about.

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4.0 Jg^-1 K^-1

4.1 Jg^-1K^-1

4.2 Jg^-1K^-1

4.3 Jg^-1K^-1

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