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What is the role of manganese dioxide in a dry cell?(a) It acts as an electrolyte(b) It acts as the cathode(c) It acts as an anode(d) It acts as a depolariserI have been asked this question in an international level competition.This interesting question is from Electrochemistry topic in portion Electrochemistry of Chemistry – Class 12

Answer»

Correct answer is (d) It acts as a depolariser

The explanation is: In a dry cell, in the remaining space between the electrolyte and the graphite cathode, a second PASTE consisting of AMMONIUM CHLORIDE and manganese dioxide is applied. The manganese dioxide acts as a depolariser as it helps to prevent the build-up of hydrogen gas bubbles.



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