Question

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Identify the incorrect statement.

NEET 2020

Answer 1

$C{r}^{3+}$ ion has $d^3$ configuration $\left(t_{2g}^3{e}_g^0\right)$ which makes $C{r}^{3+}$ stable by providing crystal field stabilisation energy. Thus, $C{r}^{2+}$ ion can easily change to $C{r}^{3+}$ (i.e. get oxidised) and acts as a strong reducing agent
$Cr{O}_4^{2-}$
Oxidation state of $Cr$
$x+(-8)=-2x=+6$

$C{r}_2{O}_7^{2-}$
Oxidation state of $Cr$
$2x+(-14)=-2x=+6$
Option (c) will be the answer