17
Question
Observe the following diagram. In which test tube a small iron nail will rust rapidly?
Observe the following diagram. In which test tube a small iron nail will rust rapidly?
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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.
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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