Question

Which of the following statements regarding corrosion is true?

(a) Corrosion does not depend on the reactivity of the metal

(b) Presence of impurities does not affect the rate of corrosion

(c) Strains in metals affect the rate of corrosion

(d) Presence of electrolytes does not affect the rate of corrosion

This question was addressed to me during an interview for a job.

This intriguing question comes from Electrochemistry in section Electrochemistry of Chemistry – Class 12

Answer 1

Correct choice is (c) Strains in metals affect the rate of corrosion

To explain I would say: More active metals are readily corroded. Presence of impurities in metals enhances the chances of corrosion. Pure metals do not corrode. Corrosion takes place rapidly at bends, scratches, nicks and cuts in the metal. Electrolytes, if present, also increase the rate of corrosion.