which of the following is a redox reaction ?

Options

A. `NaCl+KNO_(3)rarr NaNO_(3)+KCl`
B. `CaC_(2)O_(4) +2HCl rarr CaCl_(2)+H_(2)C_(2)O_(4)`
C. `Mg(OH)_(2)+2NH_(4)Cl rarr MgCl_(2)+NH_(4)OH`
D. `Zn+2AgCN rarr 2Ag + Zn(CN)_(2)`

Answer

D

Explanation

`Zn overset("Oxi.")(rarr)Zn^(2+)+2e^(-)Ag^(+)+e^(-)overset("Red")(rarr)Ag`