Question

Consider the following reaction : `HCHO+2[Ag(NH_(3))_(2)]^(+)+3OH^(-)rarr2Ag+HCO O^(-)+4NH_(3)+2H_(2)O`
Which of the following statements regarding oxidation and reduction is correct?
A. HCHO is oxidised to `HCO O^(-)` and `[Ag(NH_(3))_(2)]^(+)` is reduced to Ag.
B. HCHO is reduced to `ddHCO O^(-)` and `[Ag(NH_(3))_(2)]^(+)` is oxidised to Ag.
C. `[Ag(NH_(3))_(2)]^(+)` is reduced to Ag while `OH^(-)` is oxidised to `HC O O^(-)`
D. `[Ag(NH_(3))_(2)]^(+)` is oxidised to `NH_(3)` while HCHO is reduced to `H_(2)O`.

Answer 1

Correct Answer - A
`HCHO+2[Ag(NH_(3))_(2)]^(+)+3OH^(-)rarr2Ag+HCO O^(-)+4NH_(3)+2H_(2)O`
`HCHO rarr HCO O^(-)` (oxidation)
`[Ag(NH_(3))_(2)]^(+)rarr Ag` (reduction)