Which of the following is true for a dry cell? a) it contains boric acid, which is a solid acid. b) the graphite rod does not undergo reduction, even though it is the cathode. c) it can be recharged many times. d) all of the above

b) The graphite rod does not undergo reduction, even though it is the cathode.

Explanation: Dry cell, is compact form of Leclanche cell. It consists of a cylindrical zinc container which acts as anode. A graphite rod which acts as cathode is placed in the center and is coated with  powdered and carbon. The in between space is filled with a paste of and

At anode: Oxidation

At cathode: Reduction

Thus it is and not graphite which undergoes reduction.

the answer is b. dilution