Answer :

Copper being a metal is an excellent reducing agent. When copper turnings are heated with conc. H2SO4, the sulphur undergoes reduction and copper undergoes oxidation to evolve SO2 gas.


Rxn:



This SO2 gas gives out pungent smell and decolourizes KMnO4 and regenerates the acid consusmed in the first reaction, it is as follows:


Rxn:



The MnSO4 is colourless compound which is the main reason behind decolourization.


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