Question

.(c) Name the gas evolved in each of the following cases:

(i) Copper carbonate is heated strongly.

(ii) Action of dilute hydrochloric acid on sodium sulphite.

(iii) Nitrogen combines with hydrogen.

(iv) Action of dilute sulphuric acid on sodium carbonate.

(v) Addition of sodium to cold water.​

Answer 1

Answer:

1. when green copper carbonate (CuCo3) is heated it decompose forming copper oxide (CuO) and carbon dioxide {Co2} .
2. when HCl reacts with sodium sulphite , it form sodium chloride and sulphur dioxide which gives smell of burning sulphur.
3. when hydrogen gas combines with nitrogen to form ammonia the following chemical reaction take place : N2 + 3H2 forms 2 NH3.
4. when dilute sulphuric acid reacts with sodium carbonate , carbon dioxide gas is released.

H2SO4 + Na2CO3 it form Na2SO4 + H2O + CO2

5, sodium element is a very reactive metal . if a small amount of sodium is thrown in water , it usually wizzes on top reacting vigorously to form sodium hydroxide and hydrogen gas.

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