Explanation:

- Article 343 (1):

- This article states that the official language of the Union shall be Hindi in the Devanagari script.

- It was part of the Constitution adopted on January 26, 1950.

- Additionally, it outlined the use of English for official purposes for a period of 15 years from the commencement of the Constitution.

- Article 123:

- Relates to the President's power to promulgate ordinances during Parliament's recess.

- This is not connected to the official language.

- Article 231:

- Deals with the establishment of a common high court for two or more states.

- It is unrelated to the language provision.

- Article 108:

- Pertains to the joint sitting of both Houses of Parliament.

- Not relevant to language issues.