1.

Which of the following phenomena occur, when a small amount of acid is added to water? (i) Ionisation, (ii) Neutralisation, (iii) Dilution, (iv) Formation

Answer»

(i) and (II)
(i) and (iii)
(ii) and (iii)
(ii) and (iv)

Solution :(i) When water is ADDED to an acid, the molecules DISSOCIATE to from ions
`HCl+H_(2)OrarrH^(+)+Cl^(-)+H_(2)O`
`H_(2)O+H^(+)rarrH_(3)O^(+)`(Hydronium ion)
(ii) Mixing of an acid with water is called DILUTION, it results in the decrease in the concentration of ions, `(H_(3)O^(+))` per unit volume.


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