Who was the British prime minister of India?

Answer 1

Britain did not have a Prime Minister in India when it was a part of the British Empire; instead it had a Viceroy, who was appointed by the British Government and whose functions were somewhere between Prime Minister and President of the Colonial Government.

Before it was ruled directly by the British Crown, India was run by the East India Company, a British trading and industrial conglomerate whose malpractice and lack of regard for the Indian people led to the Indian Mutiny of 1856. After this had been suppressed, the Company was forced to hand over Indian governance directly to the UK government and civil service. It was then that the position of Viceroy was created- there were a great number of Viceroys covering the ensuing 90 year period in between the end of the Mutiny and Indian Independence, and it wouldn't be possible to list them all here, but if you Google 'Viceroys of India', the Wikipedia page on the subject will give you a full list of them.