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Exercise :: General Science - Elements and Metals

31. 

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

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: Option A

Explanation:

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33. 

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

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: 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

Answer: Option D

Explanation:

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