Under which Article of the Constitution of India can the President of India be impeached ?

Under the Constitution of India, the President can be removed from office before the completion of their five-year term through the process of impeachment for 'violation of the Constitution' [c1][t2]. Article 56(1)(b) establishes that the President may be removed in the manner provided in Article 61 [t6][t7]. Article 61 specifically details the 'Procedure for impeachment of the President' [c4]. This quasi-judicial process can be initiated by either House of Parliament [c1][t5]. It requires a formal charge preferred by one House, a 14-day written notice signed by at least one-fourth of the total members of that House, and a resolution passed by a majority of not less than two-thirds of the total membership [t1][t8]. The other House then investigates the charges, and if it also passes the resolution with a two-thirds majority, the President stands removed [t1].

Sources

1. [1] Introduction to the Constitution of India, D. D. Basu (26th ed.). > Chapter 11: The Union Executive > 1. The President and the Vice-Prelideat > p. 206
2. [2] Indian Polity, M. Laxmikanth(7th ed.) > Chapter 92: World Constitutions > PRESIDENT AND VICE-PRESIDENT > p. 697
3. [3] https://ceoharyana.gov.in/Website/ELECTIONCOMMISSION/Images/fe7f343d-12bc-45e3-b3af-e6ffadf44be7.pdf
4. [4] https://www.mea.gov.in/Images/pdf1/Part5.pdf