Question # 1

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

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NaCO₃

NaHCO₃

CA(HCO₃)₂

CaSO₄

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

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Two

Three

Four

Six

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 diseases severe diarrhea and can be fatal?

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Joundice

Cholera

Dysentery

Typhoid

Water which produces good lather with soap is called.

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Soft water

Hard water

Heavy water

All of them

Swimming pools are cleaned by the process.

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Chlorination

Hydrogenations

Saponification

None of them

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

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Iodine

Chlorine

fluorine

Bromine

Temporary hardness of water is removed by adding.

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Ca(OH)₂

NaOH

KOH

CaSO₄

Neurological damage is caused by the poisoning of.

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Lead

Cadimium

Mercury

All of them

Chemical form of gypsum.

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MgSO₄. 5H₂O

CaSO₄. 2H₂O

FeSO₄. 5H₂O

CuSO₄. 5H₂O

Which compound protect teeth from diseases?

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Fluorine compound

Chlorine compound

Iodine compound

Bromine compound

How many percentage to water contains oceans?

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67%

77%

87%

97%

Inland water includes.

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River

Lakes

Streams

All of them

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