S Block Elements Question 73
Question: A solid compound ‘X’ on heating gives $ CO_2 $ gas and a residue. The residue mixed with water forms ‘Y’ on passing an excess of $ CO_2 $ through ‘Y’ in water a clear solution ‘z’ is obtained. On boiling ‘Z’ compound, ‘X’ is reformed. The compound ‘X’ us
Options:
A) $ Ca{{(HCO_3)}_2} $
B) $ CaCO_3 $
C) $ Na_2CO_3 $
D) $ K_2CO_3 $
Show Answer
Answer:
Correct Answer: B
Solution:
[b] $ Ca\underset{(X)}{\mathop{CO_3}}\to CaO+CO_2 $ $ CaO+H_2O\to Ca\underset{(Y)}{\mathop{{{(OH)}_2}}} $ $ Ca{{(OH)}_2}+2CO_2\to \underset{(Z)}{\mathop{Ca{{(HCO_3)}_2}}} $ $ Ca{{(H\underset{(Z)}{\mathop{C}}O_3)}_2}\xrightarrow{\Delta }Ca\underset{(X)}{\mathop{C}}O_3+H_2O $
BETA
