JEE Main 2017 · 9 Apr · Shift 1 · Chemistry Q37

← JEE Main 2017 · 9 Apr · Shift 1

ChemistrySingle correct+4 / -1Question 37 of 90

A gas undergoes change from state A to state B. In this process, the heat absorbed and work done by the gas is 5 J and 8 J, respectively. Now gas is brought back to A by another process during which 3 J of heat is evolved. In this reverse process of B to A :

10 J of the work will be done by the gas.

6 J of the work will be done by the gas.

10 J of the work will be done by the surrounding on gas.

6 J of the work will be done by the surrounding on gas.

Answer and worked solution

Official answer: D

From A to B, $\Delta U=q-w=5-8=-3$ J. Going back, $\Delta U=+3$ J with $q=-3$ J, so the work done by the gas is $q-\Delta U=-6$ J: 6 J of work is done by the surroundings on the gas.

Topics:First law and enthalpy

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JEE Main 2017 · 9 Apr · Shift 1, Chemistry question 37