First slide

Common ion effect

Question

Which one of the following statements is incorrect?

Easy

A

The degree of ionisation of a weak electrolyte increases with dilution
B

Strong electrolytes are ionised completely at all concentrations
C

Addition of ${NH}_{4} Cl to {NH}_{4} OH$ increases the ionisation of the latter
D

Increase of temperature increases the ionisation

Solution

Addition of ${NH}_{4} Cl to {NH}_{4} OH$ decreases the ionisation of ${NH}_{4} OH$ due to common ion effect

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