State which of the following solutions contain:

(i) molecules only

(ii) ions only

(iii) both molecules and ions — CS₂; CH₃COOH ; NH₄OH ; NaOH ; dil. HNO₃ ; Na₂CO₃ ; CuCl₂ ; oxalic acid ; pure H₂O, kerosene ; HI.

Differentiate between

(i) Electrolytes and Non-electrolytes

(ii) Strong and Weak electrolytes

(iii) Anode and Cathode

(iv) Electrolytic dissociation and ionization with suitable examples.

Compare the flow of electricity through a nickel wire and nickel sulphate solution.

State which of the following solutions are weak electrolytes — dil. HCI; carbonic acid; NH₄OH; dil. H₂SO₄; AgNO₃; Na₂CO₃; PbBr₂; KOH; HI; oxalic acid, NaHCO₃; sodium acetate; Na₂SO₄; NaOH.