One mole of a gas absorbs 300 J of heat at constant volume and its temperature
One mole of a gas absorbs 300 J of heat at constant volume and its temperature is raised from 30 to 35⁰C. The value of ΔE is
Options
(a) 300 J (b) 0.1 J […]
Thermodynamics
Two moles of an ideal gas expand spontaneously into a vacuum. The work done is
Two moles of an ideal gas expand spontaneously into a vacuum. The work done is
Options
(a) 2 joules (b) 4 joules (c) zero (d) infinite
Correct Answer:
zero
Explanation:
In a free expansion […]
Which of the following equations describe the first law of thermodynamics
Which of the following equations describe the first law of thermodynamics
Options
(a) ΔE = q + w (b) q = ΔE + 1 (c) q = ΔE – w (d) w = ΔE […]
The entropy change in the conversion of a solid into its different states
The entropy change in the conversion of a solid into its different states can be obtained by using
Options
(a) The third law of thermodynamics (b) Equation ΔS = ₀∫ Cp/T dt (c) Equation […]
In an exothermic reaction
In an exothermic reaction
Options
(a) enthalpy of reactants is equal to that of the products (b) enthalpy of reactants is greater than that of the products (c) enthalpy of reactants is less than […]
At 0K, (i) ¹²C and (ii) a mixture of ¹²C and ¹⁴C will
At 0K, (i) ¹²C and (ii) a mixture of ¹²C and ¹⁴C will
Options
(a) both have zero entropy (b) both have positive entropy (c) have equal entropies per mol (d) have unequal entropies
For the reaction 2SO₃(g) → 2SO₂(g) + O₂(g) the entropy change (ΔG) is
For the reaction 2SO₃(g) → 2SO₂(g) + O₂(g) the entropy change (ΔG) is
Options
(a) ΔS > 0 (b) ΔS < 0 (c) ΔS = 0 (d) ΔS < ΔH/T
Correct Answer:
ΔS < […]
In which of the following conditions a chemical reaction can not occur
In which of the following conditions a chemical reaction can not occur
Options
(a) ΔH and ΔS increase and TΔS > ΔH (b) ΔH and ΔS decrease and ΔH > TΔS (c) ΔH increases […]
If the melting point of ice is 0⁰C and latent heat of fusion is 5.46 kJ mol⁻¹,
If the melting point of ice is 0⁰C and latent heat of fusion is 5.46 kJ mol⁻¹, the entropy change for the conversion of 18 g of ice to water at one atmosphere is
The internal energy of a system is the sum of
The internal energy of a system is the sum of
Options
(a) vibrational energy and electronic energy (b) vibrational energy and rotational energy (c) vibrational energy, rotational energy, electronic energy and translational energy (d) […]