निम्नलिखित में से कौन सा एक ऐसा अधातु है जो विभिन्न अपररूपों (allotropic forms) में अस्तित्व में रह सकता 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?