Answer:
(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.
(ii) All metal carbonates and hydrogen carbonates react
with acids to form a corresponding salt, carbon dioxide and water.
Metal carbonate + Acid ®
Salt + Carbon dioxide + Water
Metal hydrogen carbonate + Acid ®Salt + Carbon dioxide + Water
For example, sodium carbonate reacts with dilute
hydrochloric acid as follows:
Sodium hydrogen carbonate reacts with dilute hydrochloric
acid as follows:
On
passing the gas liberated (CO2) through lime water [Ca(OH)2]
the white precipitates of CaCO3 is obtained.
On passing excess carbon
dioxide, the solution of calcium hydrogen carbonate is obtained.
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