Which one of the following reactions does not involve either oxid… - Vidyadip

MCQ

Which one of the following reactions does not involve either oxidation or reduction

A
$VO_2^ + \, \to \,{V_2}{O_3}$
B
$Na\, \to \,N{a^ + }$
✓
$CrO_4^{2 - }\, \to \,C{r_2}O_7^{2 - }$
D
$Z{n^{2 + }}\, \to \,Zn$

✓

Answer

Correct option: C.

$CrO_4^{2 - }\, \to \,C{r_2}O_7^{2 - }$

(c) $\mathop {CrO_4^{2 - }}\limits^{ * \,\,\,\,\,\,\,\,\,\,\,\,} \mathop {C{r_2}O_7^{2 - }}\limits^{ * \,\,\,\,\,\,\,\,\,\,\,\,\,} $

$x + [( - 2) \times 4] = - 2$$2x + ( - 2) \times 7 = - 2$$x = 8 - 2 = + 6$$2x = 14 - 2 = 12$,$x = \frac{{12}}{2} = + 6$

In this reaction oxidation and reduction are not involved because there is no change in oxidation number.

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