Q 1187191987.     `I^-` ion reacts with `I_2 ` in aqueous solution to form ` I_3^- ` ion as
`I_(aq) + I_(aq) ^2⇌ I_3(aq).^− ` When a solution containing `1` mol of KI and `0.25` mol of `I_2` was reacted with excess of `AgNO_3, 0.80 ` mol of yellow precipitate was obtained. The stability constant of `I_3^(-)` ion is

A

`2.0`

B

`1.0`

C

`5.0`

D

`4.5`

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