निम्नलिखित में से किस तत्व को विद्युत अपघटनी अपचयन (electrolytic reduction) द्वारा निष्कर्षित किया जाता है?

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?