सेफ्टी माचिस की तीली की नोक पर मुख्य रूप से कौन सा रासायनिक पदार्थ मौजूद होता है?

The 'Drain of Wealth' theory was propounded by which Indian nationalist leader?

Which event is considered the turning point in Mahatma Gandhi's leadership in the Indian independence movement?

Which African leader is known for his non-violent opposition to colonial rule?