5(ii)
Ammonia gas is passed over heated copper (II) oxide in a combustion tube:
(a) Name the gas evolved.
(b) What will be the colour of the residue that is left in the combustion tube at the end of the reaction?
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(a) Nitrogen (N2)
(b) Reddish-brown
Reason
(a) When ammonia gas is passed over heated copper (II) oxide in a combustion tube nitrogen gas is evolved.
2NH3 + 3CuO ⟶ 3Cu + 3H2O + N2 [g]
(b) The residue is reddish-brown copper metal.