Question

Assertion: The formal oxidation number of sulphur in $N{a}_2{S}_4{O}_6$ is 2.5.
Reason: Two $\text{S-atoms}$ are not directly linked via $\text{O-atoms}$.

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

Answer 1

The correct option is B Both Assertion and Reason are true and Reason is the correct explanation for Assertion.


Two $\text{S-atoms}$ are directly linked i.e. not linked via $\text{O-atoms}$
$\text{Formal oxidation number of sulphur}=\frac{2\times 5+2\times 0}{4}=2.5$

Hence, option (a) is the correct answer.