Explanation
CuCr_2O_7 solution is green because Cu^{2+} ions are blue and Cr_2O_7^{-2} ions are yellow in aqueous medium. Both blue and yellow colours mix up to give a green colour.
Hence option D is correct.
(i) \underset{aq. suspension}{BaCO_3}+Na_2CrO_4+AcOH\rightarrow \underset{ppt} BaCrO_4+Na_2CO_3
(ii) \underset{aq. suspension}{BaCO_3}+Na_2CrO_4+HCN\rightarrow \underset{ppt.} BaCrO_4+Na_2CO_3
So M and N are BaCrO_4.
Hence option A is correct.
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