E-PolyLearning

31. Potassium nitrate is used in
a. medicine
b. fertiliser
c. salt
d. glass
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Answer: (b).fertiliser

32. Permanent hardness of water may be removed by the addition of
a. sodium carbonate
b. alum
c. potassium permanganate
d. lime
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Answer: (a).sodium carbonate

33. Soda water contains
a. carbonic acid
b. sulphuric acid
c. carbon dioxide
d. nitrous acid
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Answer: (c).carbon dioxide

34. The most important ore of aluminium is
a. galena
b. calamine
c. calcite
d. bauxite
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Answer: (d).bauxite

35. Most soluble in water is
a. camphor
b. sulphur
c. common salt
d. sugar
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Answer: (d).sugar