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D And F Block Elements

JEE Main 2026 (Online) 5th April Evening Shift

MCQ+4 / -12026

A paper dipped in a dil. $\mathrm{H}_2 \mathrm{SO}_4$ solution of ' $X$ ' upon treatment with $\mathrm{SO}_2$ gas turns into green. The compound ' $X$ ' is :


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