(i) In the following schematic diagram for the preparation of hydrogen gas as shown in figure , what would happen if 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) Sodium hydroxide is taken in place of dilute sulphuric acid and the tube is heated . (ii) How do metal carbonates and metal hydrogencarbonates react with acids ?

(i) In the following schematic diagram for the preparation of hydrogen

1.	(i) In the following schematic diagram for the preparation of hydrogen gas as shown in figure , what would happen if 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) Sodium hydroxide is taken in place of dilute sulphuric acid and the tube is heated . (ii) How do metal carbonates and metal hydrogencarbonates react with acids ?
Answer» SOLUTION :(i) (a) Hydrogen gas will evolve with greater SPEED. (b) Almost same amount of gas is evolved. (c) If SODIUM hydroxide is TAKEN, hydrogen gas will be evolved . `Zn +2NaOH rarrunderset("Sodium zincate")(Na_2ZnO_2)+H_2` (ii) All metal carbonates and hydrogencarbonates react with acids to form a corresponding salt, carbon dioxide and water . Metal carbonate + Acid `rarr` Salt + Carbon dioxide + Water Metal hydrogencarbonate + Acid `rarr` Salt + Carbon dioxide + Water Forexample , sodium carbonate reacts with dilute hydrochloric acid as FOLLOWS : `Na_(2)CO_(3)(s)+2HCl(aq) rarr2NaCl(aq)+H_(2)O(l)+CO_2(g)` Sodium hydrogencarbonate reacts with dilute hydrochloric acid as follows : `NaHCO_(3) (s) + HCl(aq) rarr NaCl(aq)+H_(2)O(l)+CO_(2)(g)`