In the following question, out of the given four alternatives, select the alternative which best expresses the meaning of the Idiom/Phrase. Cry in the wilderness
When iron is exposed to moist air, a reddish brown coating of hydrated Iron (III) Oxide (Fe2O3) is deposited on its surface. This reddish brown coating is called
A sentence has been given in Active/Passive Voice. Out of the four given alternatives, select the one which best expresses the same sentence in Passive/Active Voice.