Question

nail is placed in each of the four testA,B,C,D as shown below . (1) identify the test tube in which the nail wood rust the least why. Q.2 identify the test tube in which the nail wood rust the fastest why . please answer the question . anwer me this question only 4 marks​

Answer 1

Answer:

A.1 Least rusting will take place in dry air because rusting process needs atleast both air and water to happen.

A.2 Fastest process is the salt water because the electrons move fast in salty water than in moist air or normal water.

Answer 2

Answer

Correct option is

B

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.So in this case iron doesn't rust.

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.The iron rust due to the contact of salt.

C) Air: Air is required for a metal to undergo corrosion as when metal gets oxidized, electronegative elements from air gets reduced.Iron doesn't rust in this case

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.