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 :
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 false
- (B)Statement I is false but Statement II is true
- (C)Both Statement I and Statement II are true
- (D)Statement I is true but Statement II is false✓ Correct
Answer: (D)
Solution
Corrosion is indeed an electrochemical process: within a corroding metal surface, the region of purer or more exposed/strained metal acts as the anode, where oxidation occurs, while an adjoining impure or already-oxidized patch acts as the cathode, where reduction (typically ) takes place. Statement I correctly describes this anode/cathode assignment.
The cathodic step is accelerated by ions, so corrosion proceeds faster in acidic medium than in alkaline medium, where hydroxide can even help passivate the metal surface. Statement II, which claims the rate is higher in alkaline medium, is false.
Statement I is true, but Statement II is false.
The cathodic step is accelerated by ions, so corrosion proceeds faster in acidic medium than in alkaline medium, where hydroxide can even help passivate the metal surface. Statement II, which claims the rate is higher in alkaline medium, is false.
Statement I is true, but Statement II is false.
JEE Main · 2025 · 22 Jan 2025 · Shift 2 · Single correct option