Short Answer Type(i) Limited scope: Arrhenius concept is limited to aqueous medium only. It fails to explain the behaviour of acids and bases in a non-aqueous solvent like ammonia,sulphur dioxide,alcohol, etc.
(ii) According to Arrhenius, the acidic and basic properties are due to H+ and OH–ions respectively. However, these ions do not exist as such that readily get hydrated and represented as H+ (aq) and OH– (aq).
(iii) It fails to explain the acidic nature of CO2, SO2, SO3, N2O5 which do not contain any hydrogen.
(iv) It fails to explain the basic nature of CaO, NH3,Na2CO3 which do not contain any hydroxyl group.
Long Answer TypeDiscuss the Lowry Bronsted concept of acids and bases.
Or
Discuss the protonic concept of acids and bases.
Short Answer Type
State the formula and name of conjugate acid of the following bases:
(i) 
(ii) NH3
(iii) CH3COO– (iv) HS–
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