1.

Difference between Common Ion Effect and Odd Ion Effect.

Answer»
Common Ion EffectOdd Ion Effect
NH4OH ⇌ NH4+ + OH 
On mixing NH4Cl
NH4Cl →NH4+ + Cl
NH4OH ⇌ NH4+ + OH 
On mixing HCl
HCl → H+ + Cl
Due to mixing of common ion concentration of ammonium ion will increase therefore equilibrium will shift in backward direction i.e. rate of backward reaction increases means α decreases.Due to mixing of odd ions concentration of OH will decrease 
∴ Equilibrium will shift in forward direction i.e. rate of forward reaction increases, means α increases



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