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Q.

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

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a

make the ship lighter

b

prevent puncturing by under-sea rocks

c

keep away the sharks

d

prevent action of water and salt

answer is D.

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Detailed Solution

Several blocks of magnesium are fixed to the bottom of a ship to prevent action of water and salt.

Magnesium offers cathodic protection, preventing corrosion or rust.

Hence, correct option is D.

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