Write the characteristic tests for the ${\mathrm{CO}}_2$ gas.

Write the characteristic test for the ${\mathrm{H}}_2$ gas.

You could have noted that when copper powder is heated in a china dish the surface of copper becomes black coloured.

Why has this black coloured substance formed?

You could have noted that when copper powder is heated in a china dish the surface of copper becomes black coloured.

What is the black substance?

You could have noted that when copper powder is heated in a china dish the surface of copper becomes black coloured.

Write the chemical equation of the reaction that takes place.

Balance the following reaction and identify its type.

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