Assertion: (A): The reactions between `NH_(3)` and `MnO_(4)^(ө)` occurs in an acidic medium.
`NH_(3)+MnO_(4)^(ө)rarrMnO_(2)+NO_(2)`
Reason (R ): `MnO_(4)^(ө)` is reduced to `MnO_(2)` in acidic medium.

Options

A. If both `(A)` and `(R )` are correct and `(R )` is the correct explanation of `(A)`.
B. If both `(A)` and `(R )` are correct but `(R )` is not the correct explanation of `(A)`.
C. If `(A)` is correct but `(R )` is incorrect.
D. If both `(A)` and `(R )` are incorrect.

Answer

D

Explanation

Correct (A): The reaction occurs in a basic medium.
Correct (R): `MnO_(4)^(ө)` is reduced to `MnO_(2)` in a mild basic medium or neutral medium whereas in an acidic medium, `MnO_(4)^(ө)` is reduced to `Mn^(2+)` and in a strong basic medium, it is reduced to `MnO_(4)^(2-)`.