Question

a compound ‘x’ reacts with dilute hcl and forms a gas ‘y’. then the gas ‘y’ reacts with compound ‘z’ and forms compound ‘x’ back. identify x, y and z. write all the reaction involved in it​

Answer 1

(a) X is carbon dioxide gas, Y is calcium carbonate and Z is calcium hydrogen carbonate.

(b). (i) CaCO

3

​

+2HCl→CaCl

2

​

+H

2

​

O+CO

2

​

    (ii) Ca(OH)

2

​

(aq)+CO

2

​

(g)→CaCO

3

​

(s)+H

2

​

O(l)

    (iii) CaCO

3

​

(s)+CO

2

​

(g)+H

2

​

O(l)→Ca(HCO

3

​

)

2

​

(aq)