Question

Assertion (A) : $NaB{O}_3/O{H}^{-}$ can be used for oxidation of $C{r}^{3+}$ to $C{r}^{6+}$.
Reason (R) : In alkaline solution $NaB{O}_3$ produces $H_2{O}_2$.

• A. (A) is correct; (R) is correct and (R) correctly explains (A).
• B. (A) is correct; (R) is correct and (R) doesn't explain (A) correctly.
• C. (A) is correct; (R) is incorrect.
• D. (A) is incorrect; (R) is correct.

Answer 1

The correct option is A

(A) is correct; (R) is correct and (R) correctly explains (A).

Sodium perborate undergoes hydrolysis in contact with water, producing hydrogen peroxide and borate. $H_2{O}_2$ oxidized $C{r}^{3+}$ to $C{r}^{6+}$. Hence both the assertion (A) as well as the reason (R) are correct and (R) correctly explains (A).