GROWTH AND NUTRITION OF BACTERIA QUESTIONS

31.

Potassium nitrate is used in
A.     medicine    B.     fertiliser
C.     salt    D.     glass
Answer & Explanation

Answer: Option B

Explanation:

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32.

Permanent hardness of water may be removed by the addition of
A.     sodium carbonate
B.     alum
C.     potassium permanganate
D.     lime
Answer & Explanation

Answer: Option A

Explanation:

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33.

Soda water contains
A.     carbonic acid
B.     sulphuric acid
C.     carbon dioxide
D.     nitrous acid
Answer & Explanation

Answer: Option C

Explanation:

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34.

The most important ore of aluminium is
A.     galena    B.     calamine
C.     calcite    D.     bauxite
Answer & Explanation

Answer: Option D

Explanation:

Bauxite is an aluminium ore and is the main source of aluminium.
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35.

Most soluble in water is
A.     camphor
B.     sulphur
C.     common salt
D.     sugar

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