Chemistry - Salt Analysis Question with Solution | TestHub
The sample A participates in the transformations in given scheme. Only the products containing A are shown in the scheme.
Information about compounds used in above scheme.
(i) Substance A is a solid, non metallic element and insoluble in water.
(ii) Substances B and C are gases.
Select correct statement(s) as per given information.
Options:(select one or more)
Answer:
Solution:
Identification: Sulfur (A) reacts with O₂ to form SO₂ (B) and catalytically forms SO₃ (C). SO₂ reacts with KOH to give K₂SO₃ (G), which dissolves sulfur to form potassium thiosulfate, K₂S₂O₃ (H).
A is correct: SO₂ (B) reduces acidic dichromate (K₂Cr₂O₇) from orange to green Cr³⁺.
B is correct: Al and S vapours form aluminum sulfide (Al₂S₃), which rapidly hydrolyzes in moist air.
C is correct: Thiosulfate (H) reduces the brown KI₃ solution to colourless iodide (I⁻).
Thus, the correct options are A, B, and C.
