-->

Redox Reactions

Question
CBSEENCH11006790

What are half cell reactions? Explain. 

Solution

An electrons cell is made up of two half cells in each of which a half-reaction takes place. The half reaction taking place in each half cell is known as half cell reaction. A half cell reaction in which electrons are released or oxidation occurs is called oxidation half cell reaction and the one in which electrons are accepted or reduction occurs is called reduction half-cell reaction, e.g. in Daniell cell, two half reactions taking place are:
(i) Oxidation half cell reaction (Anode reaction):
       Zn left parenthesis straight s right parenthesis space space rightwards arrow space space space Zn to the power of 2 plus end exponent left parenthesis aq right parenthesis space plus space 2 straight e to the power of minus
(ii) Reduction half cell reaction (Cathode reaction):
          Cu to the power of 2 plus end exponent left parenthesis aq right parenthesis space plus space 2 straight e to the power of minus space space rightwards arrow space space space Cu left parenthesis straight s right parenthesis