Ethanol reacts with dichromate ions in acid solution according to the equation :
$\begin{aligned} C_{2} H_{5} OH (l) + {Cr}_{2} O_{7}^{2 -} (a q) + H^{+} (a q) ⟶ {CO}_{2} (g) + {Cr}^{3 +} (a q) + H_{2} O (l) \end{aligned}$
What is the coefficient for $H^{+} (a q)$ when this euation is balanced with the smallest whol number coefficients?

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answer is D.

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Detailed Solution

The balanced reaction can be given as,

$\begin{aligned} C_{2} H_{5} OH + 2 {Cr}_{2} O_{7}^{2 -} + 16 H^{+} ⟶ 2 {CO}_{2} + 4 {Cr}^{3 +} + 11 H_{2} O \end{aligned}$

As, it can be seen in the reaction, the coefficient for $H^{+} (a q)$ is 16.

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