Which Article of Indian Constitution provides the procedure for adoption of official Language or Languages of the State?

Under Article 344 of Indian Constitution, the first ‘Official Language Commission’ was established-

Which Article of the Constitution provides that every state shall endeavour to provide an adequate facility for instruction in mother-tongue at primary stage of education?

Which Schedule of the Constitution of India contains special provisions for the administration and control of Scheduled Areas in several states?

Which of the following languages was added in the eighth schedule of the Constitution in 2003?

Which one of the following is correct about the languages mentioned in the Constitution of India?