Final answer:
In the reaction between H₂S and acidic K₂Cr₂O₇, the product not formed is CrSO₄₄ since this compound does not exist; chromium(III) sulfate is correctly represented as Cr₂(SO₄)₃. The correct answer is option (b).
Step-by-step explanation:
The question asks which substance is not formed when H₂S reacts with acidic K₂Cr₂O₇ solution. When H₂S reacts with K₂Cr₂O₇ in acidic solution, the Cr(VI) in K₂Cr₂O₇ is reduced to Cr(III). The products of this redox reaction typically include chromium(III) sulfate (Cr₂(SO₄)₃), potassium sulfate (K₂SO₄), and possibly water and sulfur dioxide if the reaction goes further to oxidize H₂S.
Among the options provided, (a) CrSO₄₄, (b) Cr₂(SO₄)₃, (c) K₂SO₄, the incorrect one is (a) CrSO₄₄, since this compound does not exist. Instead, the correct chemical formula for chromium(III) sulfate is Cr₂(SO₄)₃ as shown in option (b). Therefore, the product not formed during this reaction is CrSO₄₄.