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Q.

$H_{2} S$ (3 moles) reacts completely with acidified aqueous potassium dichromate solution. In this reaction, the number of moles of water produced is ‘y’ and the number of moles of electrons involved is ‘x’. The value of $(x + y)$ is:

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answer is 13.

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Detailed Solution

${Cr}_{2} O_{7}^{2 -} + 3 H_{2} S + 8 H^{+} \overset{6 e^{-}}{\to} 2 {Cr}^{3 +} + 7 H_{2} O + 3 S$

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