Assertion: In the reaction, `3As_(2)S_(3)+28HNO_(3)+4H_(2)O rarr 6H_(3)SAsO_(4)+9H_(2)SO_(4)+28NO` electrons transferred are `84`.
Reason: As is oxidised from `+3` to `+5` and sulphur from `-2` to `+6`.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explantion of the assertion.
C. If assertion is true but reason is false.
D. If assertion is false but reason is true.

Answer

A

Explanation

`(As^(3+))_(2) rarr 2As^(5+)4e`
`underset([As_(2)S_(3) rarr2As^(5+)3S^(6+)+282]xx3)underline((S^(2-))_(3) rarr 3S^(6+)+24e)`
`[3e+N^(5+) rarr N^(2+)]xx28`