Which of the following statement is false for an isothermal expansion of an ideal gas
Options
(a) Average kinetic energy of the molecules increases (b) Number of molecules per unit volume decreases (c) Pressure […]
The difference between ΔH and ΔE at 300 K for the reaction C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O(l)
Options
(a) 300 ˣ 8.31 J/mol (b) -300 ˣ 8.314 J/mol (c) 3 ˣ 300 […]
For a thermodynamically reversible reaction in a galvanic cell at temperature T, which one of the following is false
Options
(a) -ΔG = Wmax (b) ΔG⁰ = -RT ln K (c) ΔG = – […]
For spontaneous cooling of a hot metal rod (system) in air
Options
(a) ΔSsystem > 0,ΔSunivers < 0 (b) ΔSsystem > 0,ΔSunivers < 0 (c) ΔSsystem < 0,ΔSunivers > 0 (d) ΔSsystem < 0,ΔSunivers […]
For a spontaneous process, entropy always
Options
(a) increases (b) decreases (c) keeps changing (d) remains unchanged
Correct Answer:
increases
Explanation:
The force which is responsible for the spontaneity of a process depends upon […]
At 298 K the enthalpy of formation of liquid water is -285.9 kJ/mol and that of steam -242.8 kJ/mol. The enthalpy of vapourisation of water is
Options
(a) 43.1 kJ/mol (b) -43.1 kJ/mol (c) […]
An open system
Options
(a) can neither lose nor gain energy (b) can lose or gain energy (c) can gain or lose matter (d) can lose or gain both matter or energy
Correct Answer: […]
The heat of neutralization is the highest in the following case
Options
(a) a strong acid and a weak base (b) a weak acid and a strong base (c) a strong acid and a […]
Which expression is correct for the work done in adiabatic reversible expansion of an ideal gas
Options
(a) W = nRT ln V₂ / V₁ (b) Cv ( T₂ – T₁) (c) W = […]
Heat produced on burning 6.3 g of a fule raises the temperature of 1.5 kg of water from 30⁰C to 60⁰C.Given that the specific heat of water is 4.2 J/g ⁰C.Calculate the calorific value of […]
2017 Copyright Doctor Dreams Training Academy