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Question: Answered & Verified by Expert
Blocks of magnesium are fixed to the bottom of a ship to
ChemistryElectrochemistryBITSATBITSAT 2017
Options:
  • A block hole in the ship
  • B acidity of sea water
  • C make the ship lighter
  • D prevent the action of water and salt
Solution:
1058 Upvotes Verified Answer
The correct answer is: prevent the action of water and salt

Block of magnesium prevents the action of water and salt of iron (of ship) by sacrificing itself.

This is method of protection of ship (i.e. of iron), known as sacrificial protection. 

It prevents corrosive action of water and salt by providing cathodic protection.

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