JEE Main 2019 (Online) 9th April Evening Slot | Thermodynamics Question 113 | Chemistry

During compression of a spring the work done is 10kJ and 2kJ escaped to the surroundings as heat. The change in internal energy, $$\Delta $$U(inkJ) is :

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JEE Main 2019 (Online) 9th April Morning Slot

MCQ (Single Correct Answer)

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Among the following, the set of parameters that represents path function, is :
(A) q + w
(B) q
(C) w
(D) H–TS

(B) and (C)

(A) and (D)

(B), (C) and (D)

(A), (B) and (C)

JEE Main 2019 (Online) 8th April Evening Slot

MCQ (Single Correct Answer)

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5 moles of an ideal gas at 100 K are allowed to undergo reversible compression till its temperature becomes 200 K. If C_V = 28 JK^–1mol^–1, calculate $$\Delta $$U and $$\Delta $$pV for this process. (R = 8.0 JK^–1 mol^–1]

$$\Delta $$U = 14 kJ; $$\Delta $$(pV) = 4 kJ

$$\Delta $$U = 2.8 kJ; $$\Delta $$(pV) = 0.8 kJ

$$\Delta $$U = 14 kJ; $$\Delta $$(pV) = 18 kJ

$$\Delta $$U = 14 kJ; $$\Delta $$(pV) = 0.8 kJ

JEE Main 2019 (Online) 8th April Morning Slot

MCQ (Single Correct Answer)

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Which one of the following equations does not correctly represent the first law of thermodynamics for the given processes involving an ideal gas? (Assume non-expansion work is zero)

Adiabatic process : $$\Delta $$U= – w

Cyclic process : q = –w

Isochoric process : $$\Delta $$U= q

Isothermal process : q = – w

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