NCERT Class XI Chemistry Redox Reactions Solutions
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Question : 23
Total: 30
Chlorine is used to purify drinking water. Excess of chlorine is harmful. The excess of chlorine is removed by treating with sulphur dioxide. Present a balanced equation for this redox change taking place in water.
Solution:
The skeletal equation is : C l 2 ( g ) + S O 2 ( g ) + H 2 O ( l ) C l ( a q ) − + S O 4 2 − ( a q )
Reduction half equation :C l ( 2 g ) + 2 e − 2 C l ( a q ) −
Oxidation half equation :S O 2 ( g ) + 2 H 2 O ( l ) S O 4 2 − ( a q ) + 4 H ( a q ) + + 2 e −
Adding Eq. (i) and Eq. (ii), we get,
C l 2 ( g ) + S O 2 ( g ) + 2 H 2 O ( l ) 2 C l ( a q ) – + S O 4 2 – ( a q ) + 4 H ( a q ) +
This represents the balanced redox reaction.
Reduction half equation :
Oxidation half equation :
Adding Eq. (i) and Eq. (ii), we get,
This represents the balanced redox reaction.
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