NCERT Class XI Chemistry Redox Reactions Solutions
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Question : 21
Total: 30
The M n 3 + M n 2 + , M n O 2 H +
Solution:
The skeletal equation is :
M n ( a q ) 3 + M n ( a q ) 2 + + M n O 2 ( s ) + H ( a q ) +
Oxidation half equation :M n ( a q ) 3 +
or,M n ( a q ) + 3 + 2 H 2 O ( l ) M n O 2 ( s ) + 4 H ( a q ) + + e −
Reduction half equation :M n ( a q ) 3 + M n ( a q ) 2 +
or,M n ( a q ) 3 + + e − M n ( a q ) 2 +
Adding Eq. (i) and Eq. (ii), the balanced equation for the disproportionation reaction is
2 M n ( a q ) 3 + + 2 H 2 O ( l ) M n O 2 ( s ) + M n ( a q ) 2 + + 4 H ( a q ) +
Oxidation half equation :
or,
Reduction half equation :
or,
Adding Eq. (i) and Eq. (ii), the balanced equation for the disproportionation reaction is
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