AP EAMCET Medical 24 Sep 2020 Shift 1 Paper

Which of the following statements is correct?
a) Neither pure H2SO4, nor pure HClO4 nor their mixture can conduct electricity
b) Electrolysis of 50% H2SO4 (cold) produces H2.O2 at cathode and anode respectively
c) DC current is used for conductivity measurement
d) Graphite is better lubricant on earth than on the moon