Delhi was formally declared the future capital of the British India in :

Delhi was formally declared the future capital of the British India in : Correct Answer 1911

King George V crowned in England in 1911. A durbar was held in Delhi to celebrate this occasion in India and Delhi was declared the capital of imperial India in that durbar. The foundation stone of the city was laid by George V, Emperor of India during the Delhi Durbar of 1911.

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Who was the Viceroy when Delhi became the capital of British India?
The Sultan of Delhi who transferred two monolithic Mauryan pillars to Delhi to beautify his capital, was