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Question

In the following reactions, identify the oxidising agent and the reducing agent.
4HCl+MnO2MnCl2+2H2O+Cl2

A
MnO2 acts an reducing agent HCl acts as an oxidising agent
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B
MnO2 acts as both reducing as well oxidising agent
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C
MnO2 acts as an oxidising agent while HCl acts as an reducing agent
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D
None of the above
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Solution

The correct option is C MnO2 acts as an oxidising agent while HCl acts as an reducing agent
MnO2+4HCl=MnCl2+Cl2+2H2O
Writing the oxidation numbers on various atoms,
+4Mn2O2++14H1Cl=+2Mn1Cl2+0Cl2++12H22O
Oxidation number of Mn from +4 to +2 i.e., decrease in oxidation number. MnO2 is thus reduced. It acts as an oxidising agent. Oxidation number of Cl changes from 1 to 0, i.e., increase in oxidation number. HCl is thus oxidised. It acts as a reducing agent.

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