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A metal complex having composition Cr(NH...

A metal complex having composition `Cr(NH_3)_4 Cl_2 Br` has been isolated in two forms `A` and `B`. The form `A` reacts with `AgNO_3` to give a white precipitate readily soluble in dilute aqueous ammonia, whereas `B` gives a pale yellow precipitate soluble in concentrațed ammonia. Write the formula,of `A` and `B`

A

`[Cr(NH_3)_4 Br] Cl_2`

B

`[Cr(NH_3)_4ClBr]Cl`

C

`[Cr(NH_3)_4Cl_2]Br`

D

`[Cr(NH_3)_4]BrCl_2`

Text Solution

Verified by Experts

The correct Answer is:
C
The reaction involved is
`underset((B))([Cr(NH_3)_4Cl_2]Br) hArr [Cr(NH_3)_4Cl_2]^(+) + Br^(-) overset(AgNO_3)to underset("yellow ppt.")(AgBr) overset(conc. NH_2)to underset("Soluble")([Ag(NH_3)_2])`
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