Article 63 of Constitution of India "The Vice-President of India"
There shall be a Vice-President of India
Article 64 of Constitution of India "The Vice-President to be ex-officio Chairman of the council of States"
The Vice-President shall be ex-officio chairman of the counsel of States and shall not hold any other office of profit: Provided that during any period when the Vice-President acts as President or discharges the functions of the President under Article 65, he shall not perform the duties of the office of chairman of the council of States and shall not be entitled to any salary or allowance payable to the chairman of the council of States under Article 97
Article 65 of Constitution of India "The Vice-President to act as President or to discharge his functions during casual vacancies in the office, or during the absence, of President"
(1) In the event of the occurrence of any vacancy in the
office of the President by reason of his death, resignation
or removal, or otherwise, the Vice-President shall act as
President until the date on which a new President elected in
accordance with the provisions of this Chapter to fill such
vacancy enters upon his office.
(2) When the President is unable to discharge his functions
owing to absence, illness or any other cause, the
Vice-President shall discharge his functions until the date
on which the President resumes his duties.
(3) The Vice-President shall, during, and in respect of, the
period while he is so acting as, or discharging the
functions of, President, have all the powers and immunities
of the President and be entitled to such emoluments,
allowances and privileges as may be determined by Parliament
by law and, until provision in that behalf is so made, such
emoluments, allowances and privileges as are specified in
the Second Schedule.