1 P – Block Elements
Among CH4, NH3 and H2O, acidicity of H2O is maximum because
1) oxygen contains two lone pairs of electrons
2) bond angle in H2O is less than 1 09°28’ due to VSEPR
3) oxygen is more electronegative than C or N
4) H2O is an associated liquid
SOLUTION
Oxygen is more electronegative than C or N thus bonding pair is pulled by oxygen making ionisation of H2O easier and thus making it more acidic than NH3 and CH4
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