JEE Main 2003 Chemistry question

Several blocks of magnesium are fixed to the bottom of a ship to

(1)make the ship lighter
(2)prevent action of water and saltCorrect
(3)prevent puncturing by under-sea rocks
(4)keep away the sharks

Answer: (2)

Solution

This is sacrificial (cathodic) protection. Magnesium is more electropositive (more easily oxidised) than iron, so in contact with sea water it corrodes preferentially and

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Question ID VK-038165