In acidic medium, K _ 2 Cr _ 2 O _ 7 shows oxidising action as...

In acidic medium, ${K}_{2}{Cr}_{2}{O}_{7}$ shows oxidising action as represented in the half reaction

${Cr}_{2}{O}_{7}^{2 -} + {XH}^{+} + {Ye}^{-} \to 2A + {ZH}_{2}O$ $X, Y, Z$ and $A$ are respectively are:

Options

A $8, 6, 4$ and ${Cr}_{2}{O}_{3}$
B $14, 7, 6$ and ${Cr}^{3 +}$
C $8, 4, 6$ and ${Cr}_{2}{O}_{3}$
D $14, 6, 7$ and ${Cr}^{3 +}$

Correct answer

D. $14, 6, 7$ and ${Cr}^{3 +}$

Step-by-step solution

Potassium dichromate, ${K}_{2}{Cr}_{2}{O}_{7}$ , is a common inorganic chemical reagent, most commonly used as an oxidizing agent in various laboratory and industrial applications.

The balanced reaction is,

${Cr}_{2}{O}_{7}^{2 -} + 14{H}^{+} + 6{e}^{-} \to 2{Cr}^{3 +} + 7{H}_{2}O$

$X = 14$

$Y = 6$

$A = 7$

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