Question # 1

Which ion cause water hardness?

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Al²

Mg²

Fe²

Na²

Sodium zeolite is naturally occurring reason of .

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NaAl (SiO₃)₂

Na₂CO₃

CaCO₃

Na₂SIO₃

Which hepatitis is caused by contaminated water?

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Hepatitis A

Hepatitis B

Hepatitis C

Hepatitis D

Which disease is caused by polluted water.

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Cholera

Typhoid

Diarrhea

All of them

Hookworm is a parasite that infects the:

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large intestine

small intestine

stomach

liver

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

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Iodine

Chlorine

fluorine

Bromine

Swimming pools are cleaned by a process:

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Hydrogenation

Bromination

Chlorination

Nitration

Water molecule had a structure;

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non-polar

polar

ionic

tetrahedral

Which disease causes bone and tooth damage?

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Fluorosis

Hepatits

Cholera

Jaundice

One H₂O molecule can form hydrogen bonding with how many other H₂O molecules?

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One

Two

Three

Four

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

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Iodine

Chlorine

Fluorine

Bromine

The bond angle between H-O-H in water is:

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104.5^o

104.6^o

104.7^o

104.8^o

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