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JEE Main 2025 Jan 22 Shift 2, Chemistry Q19: Common Cell

JEE Main2025Jan 22, Shift 2Chemistry
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 :

  1. A

    Both Statement I and Statement II are false

  2. B

    Statement I is false but Statement II is true

  3. C

    Both Statement I and Statement II are true

  4. D

    Statement I is true but Statement II is false

Solution

Corrosion is an electrochemical process: on a metal surface with inhomogeneities, the more active (purer/strained) region behaves as the anode and undergoes oxidation, while the impure or less active region acts as the cathode where reduction (typically of dissolved oxygen) occurs. Statement-I is true.

The cathodic reaction is favoured by a higher concentration of , i.e. in acidic medium. Hence corrosion proceeds faster in acidic medium than in alkaline medium. Statement-II claims the opposite and is therefore false.

Statement I is true but Statement II is false.

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