Which dynasty first introduced Persian as the official court language in Delhi Sultanate?

Which dynasty of Delhi Sultanate ruled for the shortest period?

Which dynasty of Delhi Sultanate ruled for the shortest period?

Which period is called the era of “the rule of the Forty” in the history of Delhi Sultanate age?

Who was the first Sultan of Delhi who introduced regular coins and declared Delhi the capital of his empire?

The Sultans of which dynasty ruled the country for the longest period?