Which article of the Indian Constitution states that "The official language of the Union shall be Hindi in Devanagari script"?

Article 343 of the Indian Constitution establishes Hindi in Devanagari script as the official language of the Union of India. This article also includes provisions for the continued use of English for official purposes for a period initially set at 15 years after the adoption of the Constitution. However, English has continued to be used in various official contexts beyond this initial timeframe. This article is part of Part XVII of the Constitution, which addresses official language policy.