Match List I with List II

Choose the correct answer from the options given below:

Chemistry Solution

We need to match the chemical formulas given in List-I with their characteristic colors given in List-II.

The compounds and their corresponding colors are based on standard qualitative analysis tests:

1. A. $$Fe_4[Fe(CN)_6]_3 \cdot xH_2O$$ is known as Prussian Blue, which is formed during the Lassaigne's test for nitrogen detection. Therefore, A matches with III.
2. B. $$[Fe(CN)_5NOS]^{4-}$$ is a violet-colored iron nitroprusside complex formed during the test for sulfide ions (sulfur detection). Therefore, B matches with I.
3. C. $$[Fe(SCN)]^{2+}$$ is a blood-red complex formed when ferric ions react with thiocyanate ions. Therefore, C matches with II.
4. D. $$(NH_4)_3PO_4 \cdot 12MoO_3$$ is an ammonium phosphomolybdate precipitate that has a characteristic yellow color, used to detect phosphorus. Therefore, D matches with IV.

Combining these matches, we get: $$A-III, B-I, C-II, D-IV$$.

Therefore, the correct option is $$A-III, B-I, C-II, D-IV$$.