Article 69 of Constitution of India "Oath or affirmation by the Vice-President"
Every Vice-President shall, before entering upon his office, make and subscribe before the President, or some person appointed in that behalf by him, an oath or affirmation in the following form, that is to say-swear in the name of God” I, _____, do ______________________________________ that solemnly affirm will bear true faith, and allegiance to the Constitution of India as by law established and that I will faithfully discharge the duty upon which I am about to enter."
Article 70 of Constitution of India "Discharge of President's functions in other contingencies"
Parliament may make such provision as if thinks fit for the discharge of the functions of the President in any contingency not provided for in this Chapter.
Article 71 of Constitution of India "Matters relating to, or connected with, the election of a president or Vice-President"
1) All doubts and disputes arising out of or in connection
with the election of a president or vice-President shall be
inquired into and decided by the Supreme court whose
decision shall be final.
(2) If the election of a person as President or
Vice-President is declared void by the Supreme court, acts
done by him in the exercise and performance of the powers
and duties of the office of President or Vice-President, as
the case may be, on or before the date of the decision of
the Supreme Court shall not be invalidated by reason of that
declaration.
(3) Subject to the provisions of this constitution,
Parliament may by law regulate any matter relating to or
connected with the election of a President or
Vice-President.
(4) The election of a person as President or Vice-President
shall not be called in question on the ground of the
existence of any vacancy for whatever reason among the
members of the electoral college electing him