Which medieval Indian ruler established a separate department called 'Diwan-i-Khairat' for poor and needy people?

The Sultan of Delhi who was very concerned about charity and alms and established a department called ‘Diwan-i-Khairat’ for it, was:

Which among the following Sultans of Delhi established the department 'Diwan-i-Kohi' for agricultural development?

Who founded a separate department called 'Diwan-i-amir-i-kohi' to improve agriculture ?

With reference to medieval Indian rulers, which one of the following statements is correct?

On the death of which Muslim ruler a historian said ‘the king was freed from his people and they from their king’?