1. Potassium nitrate is used in
A. medicine
B. fertiliser
C. salt
D. glass
2. Permanent hardness of water may be removed by the addition of
A. sodium carbonate
B. alum
C. potassium permanganate
D. lime
3. Soda water contains
A. carbonic acid
B. sulphuric acid
C. carbon dioxide
D. nitrous acid
4. The most important ore of aluminium is
A. galena
B. calamine
C. calcite
D. bauxite
5. Most soluble in water is
A. camphor
B. sulphur
C. common salt
D. sugar
ANSWERS:
1. Answer: Option B
2. Answer: Option A
3. Answer: Option C
4. Answer: Option D
5. Answer: Option D
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