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Question

Observe the following diagram. In which test tube a small iron nail will rust rapidly?
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A
Oil layer on boiled water
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B
Salt solution
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C
Air
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D
Air and anhydrous calcium chloride
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Solution

The correct option is C Salt solution
Answer: B) salt solution

Explanation:

A) oil layer on boiled water: Oil being more dense keeps floating on water and thus the iron nail does not come in contact with oil.

B) Salt solution: Salt dissolves in water by dissociating into ions and thus act as a good electrolyte and helps in the movement of electrons and enhance the rate of corrosion.

C) Air: Air is required for a metal to undergo corrosion as when metal gets oxidized, electronegative elements from air gets reduced.

D) Air and anhydrous calcium chloride : Anhydrous calcium chloride acts as a dehydrating agent and thus absorbs water which helps in the movement of electrons. Thus the corrosion rate will decrease.


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