Question

In the reaction, $4Cr{O}_5+6H_{2}S{O}_4\to 2C{r}_2(S{O}_4{)}_3+6H_{2}O+7O_2$, which statement is wrong?

• A. It is a disproportionation reaction.
• B. It is an intramolecular redox reaction.
• C. $Cr{O}_5$ acts as oxidant and reductant both.
• D. Cr acts as oxidant and O acts as reductant.

Answer 1

The correct option is A It is a disproportionation reaction.

$4Cr{O}_5+6H_{2}S{O}_4\to 2C{r}_2(S{O}_4{)}_3+6H_{2}O+7O_2$
+6 -1 +3 0
Here,
$2C{r}^{6+}+6e\to (C{r}^{3+}{)}_2$ : reduction
$4\left(O^{-1}\right)\to 2O_2+4e$ : oxidation
Therefore, it is an intramolecular redox reaction not a disproportionation reaction.