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When HCl is added to cobalt nitrate solution at room temp, the following reaction takes place and the reaction mixture becomes blue. On cooling the mixture it becomes pink. On the basis of this information mark the correct answer
$\begin{array}{l} {[C o {(H_{2} O)}_{6}]}_{(a q)}^{3 +} + 4 C l^{-} (a q) ⇌ {[C o C l_{4}]}_{(a q)}^{2 -} + 6 H_{2} O_{(a q)} \\ P i n k B l u e \end{array}$

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The sign of $Δ H$ cannot be predicted on the basis of this information

$Δ H < 0$ for the forward reaction

$Δ H > 0$ for the forward reaction

$Δ H = 0$ for the forward reaction

answer is C.

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Detailed Solution

On cooling the system, equilibrium moves towards left i.e backward reaction is favoured because it is exothermic reaction. Hence forward reaction is endo thermic

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