Several blocks of Mg are fixed to the bottom of a ship to:

prevent action of water and salt

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prevent puncturing by under sea rocks

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keep away the sharks

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make the ship lighter

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Solution

The correct option is B. prevent action of water and salt
Mg acts as a sacrificial anode (electrode) which prevents corrosion by the action of salt and water on the metal of the ship.

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Several blocks of Mg are fixed to the bottom of a ship to:

The correct option is B. prevent action of water and salt Mg acts as a sacrificial anode (electrode) which prevents corrosion by the action of salt and water on the metal of the ship.

The correct option is B. prevent action of water and salt
Mg acts as a sacrificial anode (electrode) which prevents corrosion by the action of salt and water on the metal of the ship.