Chief Justice of Gauhati High Court Ajit Singh administered the oath of office and secracy to Purohit at the Raj Bhavan here.
Purohit succeeded Padmanabha Balakrishna Acharya, Governor of Nagaland who was Governor in-charge of Assam.
The oath of office was administered at the Durbar Hall of the Raj Bhavan and the function was attended by Chief Minister Sarbananda Sonowal and some of his cabinet colleagues.
An public personality inseparably involved in social, political, educational and industrial fields of Vidarbha in Maharashtra, Purohit had plunged into active politics in 1977.
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In 1984 and 1989, Purohit was elected to the Lok Sabha from Nagpur-Kamptee seat and was a member of the Parliamentary Consultative Committee of Defence Ministry.
He was re-elected from the Lok Sabha seat in 1996 and served as a member of the Parliamentary Consultative Committee on Home Affairs, Member of Standing Committee on Defence and Member of Public Sector Undertaking Committee.
Purohit is also credited with revival of 'The Hitavada', an English daily founded by Gopal Krishna Gokhale, the mentor of Mahatma Gandhi.
Later talking to media, Purohit said "I am happy to be sworn in as the Governor of Assam and I assure you all that I will give my best for the welfare of all sections of the people of the state.
Assam Speaker Ranjeet Kumar Das, a number of ministers, judges of Gauhati High Court, Chief Secretary Vinod Kumar Pipersenia, Director General of Assam Police Mukesh Sahay, top civil and police officers and other dignitaries were present at the swearing-in.