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JEE Main Solutions –Thermodynamics (Chemistry) – 2018 (Online and Offline Papers)

JEE Main 2013-2017 Solutions are available on the COACHENGG APP

Q23 (JEE Main 2018 Offline): The combustion of benzene (𝑙) gives CO2(g) and H2O(𝑙). Given that heat of combustion of benzene at constant volume is –3263.9 kJ mol–1 at 25ºC; heat of combustion (in kJ mol–1) of benzene at constant pressure will be : (R = 8.314 JK–1 mol–1)
(1) 3260 (2) –3267.6 (3) 4152.6 (4) –452.46

Q24 (JEE Main 2018 Online 1): An ideal gas undergoes a cyclic process as shown in Figure.
ΔUBC = –5 kJ mol–1, qAB = 2 kJ mol–1, WAB = –5 kJ mol–1, WCA = 3 kJ mol–1
Heat absorbed by the system during process CA is :
(1) – 5 kJ mol–1 (2) + 5 kJ mol–1 (3) 18 kJ mol–1 (4) – 18 kJ mol–1

Q25 (JEE Main 2018 Online 1): For which of the following reactions, ΔH is equal to ΔU?
(1) N2(g) + 3H2(g) → 2NH3(g) (2) 2HI(g) → H2(g) + I2(g)
(3) 2SO2(g) + O2(g) → 2SO3(g) (4) 2NO2(g) → N2O4(g)

Q26 (JEE Main 2018 Online 2): Given:
(i) 2Fe2O3 (s) → 4Fe (s) + 3O2 (g) ; ∆_𝑟 𝐺° = +1487.0 kJ mol−1
(ii) 2CO (g) + O2 (g) → 2CO2 (g) ; ∆_𝑟 𝐺° = −514.4 kJ mol−1
Free energy change, ∆_𝑟 𝐺° for the reaction 2Fe2O3 (s) + 6CO (g) → 4Fe (s) + 6CO2 (g) will be :
(1) −112.4 kJ mol−1 (2) −56.2 kJ mol−1 (3) −168.2 kJ mol−1 (4) −208.0 kJ mol−1

Q27 (JEE Main 2018 Online 2): ∆_𝑓 𝐺° at 500 K for substance ‘S’ in liquid state and gaseous state are +100.7 kcal mol−1 and +103 kcal mol−1, respectively. Vapour pressure of liquid ‘S’ at 500 K is approximately equal to : (R = 2 cal K−1 mol−1)
(1) 0.1 atm (2) 1 atm (3) 10 atm (4) 100 atm

Q28 (JEE Main 2018 Online 3): At 320 K, a gas A2 is 20 % dissociated to A (g). The standard free energy change at 320 K and 1 atm in J mol–1 is approximately : (R = 8.314 JK–1 mol–1 ; ln 2 = 0.693 ; ln 3 = 1.098)
(1) 1844 (2) 2068 (3) 4281 (4) 4763

Q29 (JEE Main 2018 Online 3): For which of the following processes, ΔS is negative ?
(1) C (diamond) → C (graphite) (2) N2 (g, 1 atm) → N2 (g, 5 atm)
(3) N2 (g, 273 K) → N2 (g, 300 K) (4) H2 (g) → 2H (g)

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9 Comments

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  1. COACHengg 3 years ago

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