Question

Which one of the following statements is incorrect?

• 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

Answer 1

Answer: (C)

Statement (c) is incorrect.
It's correct form is as follows :
Addition of $NH _{4} Cl$ to $NH _{4} OH$ decreases the ionisation of $NH _{4} OH$ due to common ion effect.
Rest other statements are correct.