General Knowledge - General Science

Exercise :: General Science - Elements and Metals

31. 

Potassium nitrate is used in

A. medicine
B. fertiliser
C. salt
D. glass

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

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:

No answer description available for this question. Let us discuss.

33. 

Soda water contains

A. carbonic acid
B. sulphuric acid
C. carbon dioxide
D. nitrous acid

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

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.

35. 

Most soluble in water is

A. camphor
B. sulphur
C. common salt
D. sugar

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.




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