The chemical which can be used to separate a mixture of carbon powder and sulphur powder successfully is :
(a) carbon dioxide (b) hydrochloric acid (c) hydrogen sulphide (d) carbon disulphide
Question 12. One of the constituents of baking powder is sodium hydrogen carbonate, the other constituent is (a) hydrochloric acid (b) tartaric acid (c) acetic acid (d) sulphuric acid