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Unit - 7.2 Properties and Uses of Hydrogen — CHEMISTRY STD 8 — Question

ICSE BoardEnglish MediumSTD 8CHEMISTRYUnit - 7.2 Properties and Uses of Hydrogen1 Mark
Question
Write the correct statements:
A shining silver mass is left behind when hydrogen gas is passed for long time over heated black copper oxide.
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Answer

A shining blue mass is left behind when hydrogen gas is passed for long time over heated black copper oxide.

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