31.

Permanent hardness of water may be removed by the addition of
A. sodium carbonate B. alum
C. potassium permanganate D. lime
Answer and Explanation
Answer:A
Explanation: No answer description available for this question.
32.

Soda water contains
A. carbonic acid B. sulphuric acid
C. carbon dioxide D. nitrous acid
Answer and Explanation
Answer:B
Explanation: No answer description available for this question.
33.

The most important ore of aluminium is
A. galena B. calamine
C. calcite D. bauxite
Answer and Explanation
Answer:D
Explanation: Bauxite is an aluminium ore and is the main source of aluminium.
34.

Most soluble in water is
A. camphor B. sulphur
C. common salt D. sugar
Answer and Explanation
Answer:D
Explanation: No answer description available for this question.
35.

Most soluble in water is
A. camphor B. sulphur
C. common salt D. sugar
Answer and Explanation
Answer:D
Explanation: No answer description available for this question.