Question

When a white salt "X" is heated brown coloured gas "Y" is evolved leaving a yellow residue. "X' and "Y' are​

Answer 1

Explanation:

X−NaHCO

3

,Y−Na

2

CO

3

,Z−CO

2

carbon dioxide(Z) is an acidic oxide is produced on heating sodium bicarbonate (X) while the formation of sodium carbonate (Y).

2NaHCO

3

(X)→Na

2

CO

3

(Y)+CO

2

(Z)+H

2

O

The carbon dioxide gas is also given out when sodium bicarbonate reacts with an acid.

NaHCO

3

(X)+HCl→NaCl+CO

2

(Z)+H

2

O

The sodium carbonate is formed if caustic soda is left open in the atmosphere.

2NaOH+CO

2

(Atmosphere)→Na

2

CO

3

(Y)+H

2

O