Which of the following is a redox react...

Which of the following is a redox reaction ?

A

`NaCl+KNO_(3)rarrNaNO_(3)+KCl`

B

`CaC_(2)O_(4)+2HClrarrCaCl_(2)+H_(2)C_(2)O_(4)`

C

`Mg(OH)_(2)+2NH_(4)ClrarrMgCl_(2)+2NH_(4)OH`

D

`Zn+2AgCNrarr2Ag+Zn(CN)_(2)`

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The correct Answer is:

D

`ZnrarrZn^(2+)+2e^(-)`
`Ag^(o+)+e^(-)rarrAg`
In `(a), (b)` and `(c )`, oxidation number does not change.

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