Identify the correct statements from the following: I) Sulphide ores are concentrated by the froth-floatation process. II) Smelting is generally carried out in a Blast furnace. III) Zone refining is the primary method used for refining iron. IV) Aluminium is extracted from pyrolusite.

Which Indian independence movement leader was primarily known for his philosophy and practice of non-violent civil disobedience?

Who gave the call for 'Do or Die' during the Quit India Movement in 1942?

Which of the following revolutionary pairs were imprisoned together in Cellular Jail and faced harsh conditions, contributing significantly to the Indian independence movement?