question_answer 95)

  Assertion (A) For measuring resistance of an ionic solution an AC source is used. Reason (R) Concentration of ionic solution will change if DC source is used.

Answer:

                                                                         (a) Both assertion and reason are correct and reason is the correct explanation of assertion. Concentration of ionic solution changes on using DC current as a source of energy while on passing AC current concentration does not change. Hence, AC source is used for measuring resistance.