In which of the following redox reaction precipitate is not formed?

Options

A. `Cr^(3+) (aq) + Na_2O_2("solution") to `
B. `Fe^(3+)(aq) + (NH_4)_(2)S to`
C. `Mn^(2+)(aq) + H_2O_2 + NH_3("solution") to`
D. `Fe^(2+)(aq) + Na_2O_2("solution") to`

Answer

A