Questions

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 […]

Which of the following statement is false for an isothermal expansion of an ideal gas

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(a) Average kinetic energy of the molecules increases (b) Number of molecules per unit volume decreases (c) Pressure […]

The heat of neutralization is the highest in the following case

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(a) a strong acid and a weak base (b) a weak acid and a strong base (c) a strong acid and a […]

An open system

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(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: […]

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) […]

For a spontaneous process, entropy always

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(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 […]

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 […]