Question

on what basis the states reorganisation Act 1956 was passed

Answer 1

The States Reorganisation Act, 1956 was a major reform of the boundaries of India's states and territories, organising them along linguistic lines.

Although additional changes to India's state boundaries have been made since 1956, the States Reorganisation Act of 1956 remains the single most extensive change in state boundaries since the independence of India in 1947.