निम्नलिखित में से कौन-सी भारी धातु, जो मुख्य रूप से सीसायुक्त पेट्रोल वाले वाहनों से उत्सर्जित होती है, बड़े शहरों की वायु को प्रदूषित करती है?

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?