Question # 1

The surface tension of water is:

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very low

moderate

high

zero

Which disease is caused by polluted water.

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Cholera

Typhoid

Diarrhea

All of them

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

Temporary hardness is removed by adding.

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Quick lime

Slaked lime

Lime stone

Lime water.

Which one of the following salts makes the water permanently hard?

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NaCO₃

NaHCO₃

CA(HCO₃)₂

CaSO₄

Ionic compounds are soluble in water due to:

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Hydrogen bonding

ion-dipole forces

Dipole-dipole forces

Dipole -induced dipole forces

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

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Iodine

Chlorine

Fluorine

Bromine

Hook worm infects.

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Liver

Small intestine

Large intestine

Stomach

Which one of the following salts makes the water permanent hard.

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NaCO₃

NaHCO₃

Ca(HCO₃)₂

CaSO₄

Chemical form of gypsum.

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MgSO₄. 5H₂O

CaSO₄. 2H₂O

FeSO₄. 5H₂O

CuSO₄. 5H₂O

Water become hard because of:

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Ca+2

Mg+2

SO-24

all of these

How many times the heat capacity of water is greater than that of rocks.

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Two

Three

Four

Six

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