When $C r (s) + O H^{-} (a q) \to C r (O H)_{4}^{-} (a q) + H_{2} (g)$ (basic solution) is balanced, the sum of the coefficients of all the reactants and products is :

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Solution

The correct option is B 15
The balanced chemical equation is
$2 C r (s) + 2 O H^{-} (a q) + 6 H_{2} O (l) \to 2 C r (O H)_{4}^{-} (a q) + 3 H_{2} (g)$
The sum of the coefficients of all the reactants and products is $2 + 2 + 6 + 2 + 3 = 15$ .

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