What happens when `Mn(II)` ions free from chloride ions react with acidified solution of `(NH_(4))_(2)S_(2)O_(8)` or `K_(2)S_(2)O_(8)` in presence of a few drops of `AgNO_(3)` solution?

Explanation

Reddish-violet colouration is obtained owing to the formation of `MnO_(4)^(-)`.
`2MN^(2+)+5S_(2)O_(8)^(2+)+8H_(2)O to MnO_(4)^(-)+10SO_(4)^(2-)+16H^(+)`
`AgNO_(3)` acts as catalst.