When heat in given to a gas in an isobaric process, then
(1) The work is done by the gas
(2) Internal energy of the gas increases
(3) Both (1) and (2)
(4) None from (1) and (2)
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(3) When heat is supplied at constant pressure, a part of it goes in the expansion of gas and remaining part is used to increase the temperature of the gas which in turn increases the internal energy.