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
Answer & Explanation
Answer: Option D
Explanation:
No answer description available for this question.