Ncert Exercises & Solutions

Given below are two statements:

Assertion (A):	Beryllium carbonate is kept in the atmosphere of carbon dioxide.
Reason (R):	Beryllium carbonate is unstable and decomposes to give beryllium oxide and carbon dioxide.

1.	Both (A) and (R) are true and (R) is the correct explanation of (A).
2.	Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.	(A) is true but (R) is false.
4.	(A) is false but (R) is true.

BeO is more stable than BeCO₃ due to the small size and high polarising power of Be²⁺.

As BeCO₃ is unstable and BeO is more stable thus, when BeCO₃ is kept in an atmosphere of CO₂, a reversible process takes

place and the stability of BeCO₃ increases.

The reaction is as follows:

{BeCO}_{3} ⇌ BeO + {CO}_{2}