In the reaction sequence starting with solid thiourea reacting with P in dilute acetic acid to yield N 2 gas, SCN - , and H 2 O, followed by reaction with dilute FeCl 3 to give a blood-red solution Q, which then turns into a colorless solution R upon adding dilute HgCl 2 , the correct species P, Q, and R are respectively:

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?