निम्नलिखित में से कौन सा रासायनिक सूत्र चूना पत्थर (लाइमस्टोन) को दर्शाता 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?