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In balancing of the reaction given below, the coefficients of $C r_{2} O_{7}^{2 -}, N O_{2}^{-}$ and H⁺ respectively are
$C r_{2} O_{7}^{2 -} + N O_{2}^{-} + H^{+} \to C r^{3 +} + N O_{3}^{-}$

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1, 4 , 8

1, 3 , 8

1, 3, 12

1, 5, 12

answer is D.

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Detailed Solution

${Cr}_{2} O_{7}^{2 -} + 3 {NO}_{2}^{-} + 8 H^{+} \to 2 {Cr}^{3 +} + 3 {NO}_{3}^{-} + 4 H_{2} O$

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