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\( \mathrm{CuCO}_{3} \) was strongly heated to obtain a residue (A) and gas (B). The residue obtained was treated with a salt of sodium \( (\mathrm{X}) \) and oxide \( (\mathrm{Y}) \), which produced a blue colored glassy compound \( (C) \) on heating in oxidizing flame. The same combination of \( (X) \) and \( (Y) \) gave a green colored glassy compound (D) when \( \mathrm{Cr}_{2}\left(\mathrm{SO}_{4}\right)_{3} \) was heated with them in oxidizing flame. Match the following accordingly:
(a) \( \mathrm{A} \rightarrow \mathrm{v} ; \mathrm{B} \rightarrow \mathrm{u} ; \mathrm{C} \rightarrow \mathrm{t} ; \mathrm{D} \rightarrow \mathrm{r} \)
(b) \( \mathrm{A} \rightarrow \mathrm{r} ; \mathrm{B} \rightarrow \mathrm{u} ; \mathrm{C} \rightarrow \mathrm{p} ; \mathrm{D} \rightarrow \mathrm{w} \)
(c) \( \mathrm{A} \rightarrow \mathrm{r} ; \mathrm{B} \rightarrow \mathrm{u} ; \mathrm{C} \rightarrow \mathrm{p} ; \mathrm{D} \rightarrow \mathrm{v} \)
(d) \( \mathrm{A} \rightarrow \mathrm{q} ; \mathrm{B} \rightarrow \mathrm{s} ; \mathrm{C} \rightarrow \mathrm{t} ; \mathrm{D} \rightarrow \mathrm{r} \)
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