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Assertion : $\mathrm{BaCO}_3$ is more soluble in $\mathrm{HNO}_3$ than in plain water.
Reason : Carbonate is a weak base and reacts with the $\mathrm{H}^{+}$from the strong acid, causing the barium salt to dissociate.
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Reason : Carbonate is a weak base and reacts with the $\mathrm{H}^{+}$from the strong acid, causing the barium salt to dissociate.
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The correct answer is:
If both assertion and reason are true and the reason is the correct explanation of the assertion
$\mathrm{BaCO}_3+2 \mathrm{HNO}_3 \rightarrow \mathrm{Ba}\left(\mathrm{NO}_3\right)_2+\mathrm{H}_2 \mathrm{O}+\mathrm{CO}_2$.
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