Q. Given below are two statements : Statement (I) : Corrosion is an electrochemical phenomenon in which pure metal acts as an anode and impure metal as a cathode. Statement (II) : The rate of corrosion is more in alkaline medium than in acidic medium. In the light of the above statements, choose the correct answer from the options given below :
A) Both Statement I and Statement II are true
B) Statement I is false but Statement II is true
C) Statement I is true but Statement II is false
D) Both Statement I and Statement II are false
Explanation
[Solution by Dr. Abubacker] Statement I is taken as true: the pure metal (which is oxidised) acts as the anode and the impurity sites act as the cathode of the tiny galvanic cells. Corrosion is faster in acidic medium (more H⁺ available for the cathodic reaction) than in alkaline medium, so Statement II is false. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.