Question

We take two test tubes A and B. Test tube A contains iron nails in boiled water while test tube B contains copper nails in tap water. In which test tube rusting will be observed?

Answer 1

Explanation:

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.