Match the following. (I) HCO2^- - (P) Obtained through Solvay's process. (II) K2CO3 - (Q) Green colouration due to [Cr(H2O)6]3+ ion. (III) S2O3^2- + FeCl3 solution - (R) Reduces [Cu(C4H4O6)2]2- to

Question

Match the following. (I) HCO2^- -> (P) Obtained through Solvay's process. (II) K2CO3 -> (Q) Green colouration due to [Cr(H2O)6]3+ ion. (III) S2O3^2- + FeCl3 solution -> (R) Reduces [Cu(C4H4O6)2]2- to red ppt. (IV) SO3^2- + K2Cr2O7 / H+ -> (S) Green colouration. (V) Na2CO3 -> (T) Melts at 850°C.

Prashant Kotian · Accepted Answer

Correct answer: C. Step 1: This is the standard qualitative test for sulfide ions using sodium nitroprusside in alkaline media. Step 2: Sulfide ions (S2-) coordinate with sodium nitroprusside, [Fe(CN)5NO]2-, to yield a highly colored thionitrosyl complex: [Fe(CN)5NO]2- + S2- -> [Fe(CN)5NOS]4-. Step 3: This complex exhibits an intensely beautiful violet-purple color, corresponding to S2- in option (a).

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