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Assertion : Aq. solution of $\mathrm{CoCl}_2$ is pink in colour. It turns blue in presence of conc. $\mathrm{HCl}$. Reason : It is due to the formation of $\left[\mathrm{CoCl}_4\right]^{2-}$.
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If both assertion and reason are true and reason is the correct explanation of assertion.
$\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}+4 \mathrm{Cl}^{-} \rightleftharpoons\left[\mathrm{CoCl}_4\right]^{2-}+6 \mathrm{H}_2 \mathrm{O}$
Pink
Blue
According to Le Chatelier's principle, on adding conc. $\mathrm{HCl}$, the equilibrium shifts in forward direction giving blue colour. And when this blue colour is diluted, equilibrium shifts in backward direction leading to pink colour.
Pink
Blue
According to Le Chatelier's principle, on adding conc. $\mathrm{HCl}$, the equilibrium shifts in forward direction giving blue colour. And when this blue colour is diluted, equilibrium shifts in backward direction leading to pink colour.
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