किन खनिजों को 'जुड़वाँ खनिज' कहा जाता है क्योंकि ये आमतौर पर एक साथ पाए जाते हैं?

The arrival of which commission in India triggered widespread protests, including mass hartals across the country in 1928?

Which of the following leaders was instrumental in initiating and leading India’s struggle for independence?