The reagent used in dumas method is:

ferrous acid

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cuprous oxide

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ferric oxide

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cupric oxide

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Solution

The correct options are
B cuprous oxide
D cupric oxide

Dumas Method

This method is used to identify the presence of nitrogen in the given organic compound.

In this method nitrogen containing organic compound is heated with excess copper oxide in an atmosphere of CO2, free nitrogen is obtained in addition to CO2 and water.

$C + 2 C u O \to C O_{2} + 2 C u$

$2H + CuO\rightarrow H_2O + Cu$
Hence option B and D are correct.

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