(b) cell. Write the reactions occurring at electrodes in the electrolysis of water. Why are a few drops of conc.  added in this process? 

In the electrolysis of water, the reactions occurring at the electrodes are:

At the cathode: 2H₂O(l) + 2e⁻ → H₂(g) + __________ ______ __________ _____ ______ ______ __________ ______ ________.
__________ ____ ____ ______ _________ _____ ______ _____.
_____ ________ _________ ___ __________ ____ _______ ______ _________ ____.
_______ ______ _________ _____ _________ _____ ____ _____ ________.
_________ _____ ________ _________ _______ __________ ___ ________.
________ __________ ___ __________ _________ _________ ____.
_________ __________ ___ ____ _______.
________ ___ ___ _________ _____ ___ ___ ___ _______ ________ ________.
_____ ______ _________ ________ ________ ______ __________ ________ __________ ___.
__________ __________ _______ _____ ____ _____ ____ ___ _______.
_____ _________ __________ ______ __________ ____ ______.
_______ ______ _____ ________ _______ _____ ____ _____ ____ ________ _______.
____ _______ _______ ________ __________.
_________.
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