(A) light blue coloured compound on heating will convert into black (B) which reacts with glucose gives red compound (C) and (A) reacts with ammonium hydroxide in excess in presence of ammonium sulpha

Question

(A) light blue coloured compound on heating will convert into black (B) which reacts with glucose gives red compound (C) and (A) reacts with ammonium hydroxide in excess in presence of ammonium sulphate give blue compound (D). What is (A), (B), (C) and (D) ?

Prashant Kotian · Accepted Answer

Correct answer: D. Step 1: Both sulfite (SO3^2-) and sulfate (SO4^2-) ions react with barium chloride (BaCl2) to form white precipitates of barium sulfite (BaSO3) and barium sulfate (BaSO4). Step 2: Upon adding dilute HCl, BaSO3 readily dissolves to yield soluble Ba2+ and pungent sulfur dioxide gas (SO2), whereas BaSO4 is highly stable and completely insoluble in dilute mineral acids. Step 3: This difference in acid solubility allows clear distinction of the two anions, matching option (c).

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