Question

Assertion :In the following half reaction:
${C{r}_2{O}_7}^{2-}\to C{r}^{3+}$
Equivalent weight of ${C{r}_2{O}_7}^{2-}=\frac{\text{Molar Mass}}{3}$ Reason: Change in oxidation number of chromium is 3 per atom.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is D Both Assertion and Reason are incorrect

The oxidation number of chromium changes from +6 to +3.
Hence, the change in the oxidation number per chromium atom is +3.
The change in the oxidation number of two chromium atoms is +6.
Thus, the equivalent weight of ${C{r}_2{O}_7}^{2-}=\frac{MolarMass}{6}$