Q10 / 125 · BITSAT 2017 · Chemistry

Blocks of magnesium are fixed to the bottom of a ship to

  • A
    block hole in the ship
  • B
    acidity of sea water
  • C
    make the ship lighter
  • Correct answer
    D
    prevent the action of water and salt

Solution

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.

Hence, the correct answer is option: 'D'.

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