In the course of a chemical reaction,an oxidant:

When ammonia is passed over heated copper oxide,metallic copper is obtained. This reaction shows that ammonia is a.......

To an acidic solution of an anion,a few drops of $KMnO_4$ solution are added. Which of the following,if present,will not decolourise the $KMnO_4$ solution?

When acidified $K_2Cr_2O_7$ solution is added to $Sn^{2+}$ salts,then $Sn^{2+}$ changes to:

Which of the following can act both as an oxidising as well as reducing agent?

In the reaction $PCl_3 + Cl_2 \to PCl_5$,