Question # 1

The heat capacity of water is.

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4.2 Jg^-1 K^-1

2.1 Jg^-1K^-1

3.2 Jg^-1K^-1

5.9 Jg^-1K^-1

Permanent hardness is removed by adding.

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Na₂ zeolite.

Soda lime

Lime water

Quick lime

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

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Jaundic

Dysentery

Cholera

Typhoid

Hard water can cause.

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Stomach disorder

Boiler blasts

Inefficiency of engine

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

Which one of the following gases is used to destroy harmful bacteria in water.

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Iodine

Chlorine

Fluorine

Bromine

A sea level the boiling point of water is.

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0^oC

98^oC

100^oC

110^oC

Which element protects teeth from decay?

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Potassium

Fluorine

Sodium

Calcium

Mg²⁺ and Ca²⁺ ions react with soap to form calcium and magnesium salts of fatty acids called.

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Gelatin

Scum

Paste

None of them

Which of the following salt is soluble in water.

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NaCl

KCl

Na₂SO₄

All of them

Temporary hardness is because of.

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Ca(HCO₃)₂

CaCO₃

MgCO₃

MgSO₄

Water dissolves Non-ionic compounds by:

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Ion-Ion forces

Dipole forces

Dipole - Dipole forces

Hydrogen Bonding

Which disease cause when humans use water of industrial effluents.

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Cancer

Asthma

Jaundice

cholera

Which process is responsible for ascending of water in plants from roots to leaf?

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Condensatin

Transpiration

Capillary action

Evaporation

Hook warm larvae enter the body through.

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Food

Water

Skin

All of them

Which ion cause water hardness?

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Al²

Mg²

Fe²

Na²

Which process is responsible for ascending of water in roots:

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evaporation

transpiration

condensation

capillary action

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