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Question
On passing ammonia gas over heated copper oxide for some time, a reddish-brown residue is left behind. What property of ammonia is demonstrated here?
Options
Basic property
Oxidising property
Reducing property
Acidic property
Solution
Reducing property
Explanation:
\[\ce{CuO}\] functions as a reducing agent because it is reduced to \[\ce{Cu}\] (reddish brown ppt.) in the presence of ammonia.
\[\begin{array}{cc}
\ce{3CuO + 2NH3 ->3Cu + N2 + 3H2O}\\
\phantom{..}\ce{\underset{Reduction}{\underline{{\uparrow}\phantom{...................}{\uparrow}}}}\phantom{...............}
\end{array}\]
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