NEET 2001 Chemistry question

The most convenient method to protect the bottom of ship made of iron is : -

(1)Coating it with Red lead oxide
(2)White tin plating
(3)Connecting it with Mg blockCorrect
(4)Connecting it with Pb block

Answer: (3)

Solution

The best and most convenient protection for the hull of a ship permanently in contact with sea water is cathodic protection with a sacrificial anode: a block of a metal more electropositive than iron (such as magnesium or zinc) is connected to the hull. Mg ( V) is oxidised in preference to iron

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Question ID VK-088829