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A brown substance 'X' on heating in air ...

A brown substance 'X' on heating in air forms a substance 'Y'. When hydrogen gas is passed over heated 'Y', it again changes back into 'X'.
Name the substances X and Y.

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Oxidation and reduction reactions
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ZEN PUBLICATION-CHEMICAL REACTIONS AND EQUATIONS-ZEN ADDITIONAL QUESTIONS SECTION (SHORT ANSWER [SA] TYPE 2 QUESTIONS )
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