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0.2M KCN and 0.06M AgNO(2) solutions ar...

0.2M KCN and 0.06M `AgNO_(2)` solutions are mixed in equal volumes. At `25^(@)C K_(c)` for the reaction `Ag (CN ) _(2) ^(-) hArr Ag ^(+) + 2CN ^(-) is 1. 6 xx 10 ^(-19).` The conc. of` Ag^(+)` present in solution is

A

`1.5 xx 10 ^(-19) M`

B

`1.5 xx 10 ^(-18) M`

C

`3 xx 10 ^(-19) M`

D

`3 xx 10 ^(-18) M`

Text Solution

Verified by Experts

The correct Answer is:
B
`[Ag (CN ) _(2) ]^(-) hArr Ag ^(+) + 2 CN ^(-)`
`{:(- ,0.06,0.2,"initial conc"), (0.06, x, 0.08, "equi conc"):}`
`K _(c) = ([ Ag ^(+2) ][CN ] ^(-2))/( [Ag (CN ) _(2) ^(-)]), 1. 6 xx 10 ^(-19)= ((x) (0.08) ^(2))/( 0.06) , x = 1. 5 xx 10 ^(-18) M.`
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