question_answer 60)

  Assertion (A): The pH of acid rain is less than 5.6. Reason (R): Carbon dioxide present in the atmosphere dissolves in rain and forms carbonic acid.

Answer:

  (b) In acid rain pH is less than 7. Carbon dioxide dissolves in water to form weak acid. \[{{H}_{2}}O+C{{O}_{2}}\to \underset{Carbonic\,acid}{\mathop{{{H}_{2}}C{{O}_{3}}}}\,\]