CBSE Class 10 Science 2021 Term 1 Solved Paper

Question : 7

Total: 60

Which of the following statements about the reaction given below are correct?
MnO2+4‌HCl→MnCl2+2H2O+Cl2
(i) HCl is oxidized to Cl2
(ii) MnO2 is reduced to MnCl2
(iii) MnCl2 acts as an oxidizing agent
(iv) HCl acts as on oxidizing agent

(ii), (iii) and (iv)
(i), (ii) and (iii)
(i) and (ii) only
(iii) and (iv) only

Solution:

In the given reaction,
MnO2+4‌HCl→MnCl2+2H2O+Cl2
HCl is getting oxidized to Cl2 and MnO2 is reduced to MnCl2. This can be explained as follows:

Here,
2e+

+42

MnO

→

MnCl

2
Mn is going from +4 oxidation state to +2 oxidation thus clearly Mn is gaining electrons here MnO2 is reduced to MnCl2
2

−1

HCl

→

Cl2

+2e−
Hence Cl of HCl is in -1 oxidation state and after losing its one electron it goes to 0 (elementary form) oxidation state, hence here HCl is oxidised to Cl2.

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