1.

Explain acidified KMnO is a powerful oxidising agent with 5 examples.

Answer»

Solution :In the presence of dilute sulphuric acid, potassium PERMANGANATE acts as a very strong oxidising AGENT, Permanganate ions is converted into `Mn^(2+)` ion.
`MnO_(4)^(-)+ 8H^(+)+ 5e^(-) to Mn^(2+)+ 4 H_(2)O`
Example:
(i) Potassium permanganate oxidises ferrous salts to ferric salts.
`2MnO_(4)^(-)+ underset("Ferrous salts")(10Fe^(2+)) + 16H^(+) to2Mn^(2+) + underset("Ferric salts")(10Fe^(3+)) + 8H_(2)O`
(ii) Potassium permanganate oxidises iodide ions to iodine.
`2MnO_(4) + 10I^(-) + 16H^(+) to2Mn^(2+) + 5S +8H_(2)O`
(iii) Potassium permanganate oxidises sulphide ion to sulphur.
`2MnO_(4)^(-) + 5S^(2-) + 16H^(+) to2Mn^(2+) +5S + 8H_(2)O`
(iv) Potassium permanganate oxidises oxalic acid to CO.
`2MnO_(4)^(-)+5(COO)_(2)- + 16H^(+) to 2Mn^(2+) + 10CO_(2) +8H(2)O`
v) Potassium permanganate oxidises alcohols to aldehyde.
`2KMnO_(4) +3H_(2)SO_(4) + 5CH_(3)CH_(2)OH to 2K_(2)SO_(4) + 2MnSO_(4) + 5CH_(3)CHO +8H_(2)O`


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