JEE Main & Advanced Chemistry The s-Block Elements / s-ब्लॉक के तत्व Question Bank Mock Test - The s-Block Elements

A solid compound 'X' on heating gives \[C{{O}_{2}}\]gas and a residue. The residue mixed with water forms 'Y' on passing an excess of \[C{{O}_{2}}\]through 'Y' in water a clear solution 'z' is obtained. On boiling 'Z' compound, 'X' is reformed. The compound 'X' us

A) \[Ca{{(HC{{O}_{3}})}_{2}}\]

B) \[CaC{{O}_{3}}\]

C) \[N{{a}_{2}}C{{O}_{3}}\]

D) \[{{K}_{2}}C{{O}_{3}}\]

Correct Answer: B

Solution :

[b] \[Ca\underset{(X)}{\mathop{C{{O}_{3}}}}\,\to CaO+C{{O}_{2}}\]

\[CaO+{{H}_{2}}O\to Ca\underset{(Y)}{\mathop{{{(OH)}_{2}}}}\,\]

\[Ca{{(OH)}_{2}}+2C{{O}_{2}}\to \underset{(Z)}{\mathop{Ca{{(HC{{O}_{3}})}_{2}}}}\,\]

\[Ca{{(H\underset{(Z)}{\mathop{C}}\,{{O}_{3}})}_{2}}\xrightarrow{\Delta }Ca\underset{(X)}{\mathop{C}}\,{{O}_{3}}+{{H}_{2}}O\]