Which of the following should be added in the compound for the detection of carbon and hydrogen?

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Cu(I) oxide

Cu(II) oxide

Zn dust

Activated charcoal

answer is B.

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Detailed Solution

Carbon and hydrogen are detected by heating the compound with Cu(II) oxide. Carbon present in the compound is oxidised to carbon dioxide (tested with lime-water, which develop turbidity) and hydrogen to water (tested with anhydrous copper sulphate, which turns blue).C+2CuO⟶Δ2Cu+CO2↑,2H+CuO⟶ΔCu+H2OCO2+Ca(OH)2⟶CaCO3↓ White turbidity +H2O

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