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Chemical name of Plaster of Paris is calcium sulphate hemihydrate and its formula is


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Explain the following chemical properties of acids with the help of balanced chemical equations only.

(i) when an acid reacts with a metal carbonate


(ii) when an acid reacts with a metal bicarbonate


(iii) when an acid reacts with a metal oxide. ( CBSE 2009)

 24

In the following schematic diagram for the preparation of hydrogen gas as shown in the given figure, what would happen if the following changes are made?


(a) In place of zinc granules, same amount of zinc dust is taken in the test tube.


(b) Instead of dilute sulphuric acid, dilute hydrochloric acid is taken.


(c) In place of zinc, copper turnings are taken.


(d) Sodium hydroxide is taken in place of dilute sulphuric acid and the tube is heated. ( CBSE 2005)