JEE Main · 2026 · 06 Apr 2026 · Shift 2 · p-Block Elements

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Treatment of a gas 'X' with a freshly prepared ferrous sulphate solution gives a compound 'Y' as a brown ring. The compounds X and Y are.

(A)NO and [Fe(NO)]SO₄✓ Correct
(B)NO₂ and [Fe(NO₂)]SO₄
(C)N₂O and [Fe(N₂O)]SO₄
(D)N₂O₄ and [Fe(N₂O₄)]SO₄

Answer: (A)

Solution

In the brown ring test the nitric oxide liberated from a nitrate is passed into freshly prepared ferrous sulphate solution, where it coordinates to iron(II) to give the brown complex

[Fe (H_{2} O)_{5} (NO)]^{2 +}

, written

[Fe (NO)] S O_{4}

, seen as a brown ring. The gas X is nitric oxide, NO, and the brown compound Y is

[Fe (NO)] S O_{4}

JEE Main · 2026 · 06 Apr 2026 · Shift 2 · Single correct option

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