The dand fblock elements - Result Question 47

####47. KMnO4 can be prepared from K2MnO4 as per the reaction:

3MnO42+2H2O

2MnO4+MnO2+4OH

The reaction can go to completion by removing OHions by adding.

[NEET 2013]

(a) KOH

(b) CO2

(c) SO2

(d) HCl

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Solution:

  1. (b) HCl and SO2 are reducing agents and can reduce MnO4. CO2 which is neither oxidising and nor reducing will provide only acidic medium. It can shift reaction in forward direction and reaction can go to completion.


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