Question

Given:

1. $\underset{\left(X\right)}{MC{O}_3}\stackrel{\Delta }{\to }A\left(s\right)+B\left(g\right)$

2. $\left(A\right)+H_{2}O\to \left(C\right)$

3. $\left(C\right)+\left(B\right)\to \left(X\right)$
4. Paste of the salt ($X$) in conc. $HCl$ given green flame on ignition.

Which of the following is/are correct statement(s)?
(a) $\left(X\right)$ is $BaC{O}_3$
(b) $\left(A\right)$ is $BaO$
(c) $\left(B\right)$ is $C{O}_2$
(d) $\left(C\right)$ is $Ba(OH{)}_2$

• A. Only (a) is correct
• B. Only (b) and (c) are correct
• C. Only (d) is correct
• D. All the statements are correct

Answer 1

The correct option is D All the statements are correct

$BaC{O}_3$ on thermal decomposition gives $BaO$ and $C{O}_2$.
So, $A$ is $BaO$ and B is $C{O}_2$.
$BaO+H_{2}O\to Ba(OH{)}_2$

So, $C$ is $Ba(OH{)}_2$.
$Ba(OH{)}_2+C{O}_2\to BaC{O}_3+H_{2}O$

So, $X$ is $BaC{O}_3$.

Option $D$ is correct.