Question # 1

Which gas is used to destroy harmful bacteria in water?

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Iodine

Chlorine

Flourine

Bromine

Which compound protect teeth from diseases?

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Fluorine compound

Chlorine compound

Iodine compound

Bromine compound

Some organic compound are soluble in water due to the presence of .

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-OH

H⁺

Botha a and b

Covalent bond

The percentage of water in human body is.

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40%

50%

60%

70%

Which salt cause permanent hardness in water is:

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Ca(HCO₃)₂

Mg(HCO₃)₂

CaCl₂

KCl

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

How many percentage to water contains oceans?

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67%

77%

87%

97%

The freezing point of water is:

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10 ^oC

100^oC

0^oC

46^oC

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

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NaCO₃

NaHCO₃

CA(HCO₃)₂

CaSO₄

Which organ cause to function during Jaundice?

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Liver

Kindney

Stomach

Large intestine.

Density of water at 4°C is:

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0.976 gem-3

1 gem-3

0.956 gem-3

1.1 gem-3

Which disease causes bone and tooth damage?

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Fluorosis

Hepatits

Cholera

Jaundice

Which disease cause when humans use water of industrial effluents.

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Cancer

Asthma

Jaundice

cholera

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