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
In the following question, the sentence given with blank to be filled in with an appropriate word. Select the correct alternative out of the four and indicate it by selecting the appropriate option. _____ you work hard, you cannot succeed.
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