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Q 2600323218.     A mixture consists A (yellow solid) and B (colourless solid) and gives lilac colour in flame test. The aqueous solution of the mixture gives:
(i) Black precipitate C on passing `H_2S(g)` which is soluble only in aqua-regia. On extraction and addition of `SnCl_2`, a greyish white precipitate is obtained.
(ii) On treatment with `NH_4OH`, a reddish-brown precipitate D is obtained.
The sodium extract of the solution:
(i) On shaking with `C Cl_4//FeCl_3` gives a violet colouration in `C Cl_4` layer.
(ii) Gives yellow precipitate with `AgNO_3` solution which is insoluble in `NH_3`.
Identify compounds A, B, C and D.
JEE 2003 Mains
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