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A pale yellow solid (A) having crown shape is heated with concentrated H₂SO₄, it gives
suffocating smell of gas B, which is passed through moistened with starch iodide paper and turn it into blue. The gas B and solid A are respectively.

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SO₃ and S₂N₂

SO₂ and S₈

SO₃ and SO₂

SO₃ and S₈

answer is B.

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Detailed Solution

Sulpuhric acid is a oxidizing agent. $2 H_{2} {SO}_{4} + S_{8} (g) \to 3 S O_{2} + H_{2} O (l)$
Gas B is SO₂
Solid A is S₈

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