Article 345 Official language or languages of a State
Subject to the provisions of articles 346 and 347, the Legislature of a State may by law adopt any one or more of the languages in use in the State or Hindi as the Language or Languages to be used for all or any of the official purposes of that State; Provided that, until the Legislature of the State otherwise provides by law, the English language shall continue to be used for those official purposes within the State for which it was being used immediately before the commencement of this Constitution.

Article 346 Official language for communication between one State and another or between a State and the Union
The language for the time being authorised for use in the Union for official purposes shall be the official language for
communication between one State and another State and between a State and the Union:
Provided that if two or more States agree that the Hindi language should be the official language for communication between such States, that language may be used for such communication.

Article 347 Special provision relating to language spoken by a section of the population of a State
On a demand being made in that behalf the President may, if he is satisfied that a substantial proportion of the population of a State desire the use of any language spoken by them to be recognised by that state, direct that such language shall also be officially recognised throughout that State or any part thereof for such purpose as he may specify.