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JEE CHEMISTRY MCQ: PRACTICAL CHEMISTRY

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Sodium sulphite on heating with dilute HClHCl liberates a gas which
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Correct option: B
Turns acidified potassium dichromate paper green
Option B (Turns acidified potassium dichromate paper green) is correct because sulfur dioxide gas (SO2SO_2) released from the reaction reduces dichromate ions (Cr2O72−Cr_2O_7^{2-}) to chromium ions (Cr3+Cr^{3+}), causing the color change.

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