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The element evolving two different gases on reaction with conc. Sulphuric acid is

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answer is B.

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Detailed Solution

$C + 2 H_{2} {SO}_{4} \to {CO}_{2} + 2 H_{2} O + 2 {SO}_{2}$
Here carbon is oxidised to CO₂ and H₂SO₄ is reduced to SO₂.

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