Top 500+ TNPSC General Science Chemistry Questions & Answers - 2

Question: 6

Plaster of paris

(A) does not suffer any changes in volume while setting

(B) is highly volatile

(C) expands while setting

(D) contracts while setting

Question: 7

The permanent hardness of water appears due to

(A) Chloride and sulphate of calcium and magnesium

(B) Bicarbonates of calcium and magnesium

(C) Carbonates of calcium and magnesium

(D) None of these

Question: 8

The valecy of magnesium is

(A) 1

(B) 2

(C) 3

(D) 4

Question: 9

The spmerty wax is extracted from the

(A) Whale

(B) Petroleum

(C) Roofs of honey

(D) Palm leaves

Question: 10

Human stomach produces acid ‘X’ which helps in digestion of food. Acid ‘X’ is

(A) Acetic acid

(B) Citric acid

(C) Methanoic acid

(D) Hydrochloric acid