1.

A metal complex having composition [Cr(NH_(3))_(4)Br_(2)] was isolated in two forms (X) and (Y). Form (X) reacts with AgNO_(3) to gives a plate yellow precipitate which is partially soluble in excess of NH_(4)OH whereas (Y) gives a greenish yellow precipitate which is insoluble in NH_(4)OH. The formula of X and Y are

Answer»

`[Cr(NH_(3))_(4)BR]Br` and `[Cr(NH_(3))_(3)Br_(2)]NH_(3)` respectively.
`[Cr(NH_(3))_(4)IBR` and `[Cr(NH_(3))_(4)Br_(2)]` respectively.
both `[Cr(NH_(3))_(4)I]Brl`
`[Cr(NH_(3))_(2)lBr_(2)](NH_(3))_(2)`

Answer :B


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