Which of the following reactions should be balanced in basic medium?

Options

A. `NH_3 + MnO_(4)^(-) to MnO_2 + NO_2`
B. `Cr(OH)_2 +I_2 to Cr (OH)_3 + 2I^(-)`
C. `HNO_3 + Fe ^(2+) to Fe^(3+) +NO_2 `
D. `H_2 O_2 +Fe^(3+) to O_2 +Fe^(2+)`

Answer

A, B

Explanation

`MnO_(4)^(-) to MnO_2 ``MnO_(4)^(-) to MnO,` occurs only in basic medium `Cr(H)_2 to Cr(OH)_3` occurs only basic mediurn. (C) and (D) occurs only in acidic medium.