$ \uparrow Y_{(g)} \xleftarrow{KI} CuSO_4 \xrightarrow{dil. H_2SO_4} X (\text{Blue colour}) $. $X$ and $Y$ are:
- A$X = I_2, Y = [Cu(H_2O)_4]^{2+}$
- B$X = [Cu(H_2O)_4]^{2+}, Y = I_2$
- C$X = [Cu(H_2O)_4]^+, Y = I_2$
- D$X = [Cu(H_2O)_5]^{2+}, Y = I_2$
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