Problem 1
In the exothermic reaction the enthalpy of reaction is always: (a) Zero (b) Positive (c) Negative (d) None of these
Problem 2
The enthalpy change of a reaction does not depend on: (a) Initial and final enthalpy change of reaction (b) State of reactants and products (c) Different intermediate reactions (d) Nature of reactants and products
Problem 4
If the value of \(\Delta \mathrm{H}\) in a reaction is positive, then the reaction is called: (a) Exothermic (b) Endothermic (c) Polymorphic (d) Polytropic
Problem 5
Heat required to raise the temperature of \(1 \mathrm{~mol}\) of a substance by \(1^{\circ}\) is called: (a) Specific heat (b) Molar heat capacity (c) Water equivalent (d) Specific gravity
Problem 6
Plants and living beings are examples of: (a) Isolated system (b) Adiabatic system (c) Open system (d) Closed system
Problem 7
In thermodynamics, a process is called reversible when: (a) The surroundings are always in equilibrium with the system (b) There is no boundary between system and sur roundings (c) The surroundings and system change into each other (d) The system changes into the surroundings sponta neously
Problem 8
Which of the following is an extensive property? (a) Molarity of substance (b) Number of moles (c) Molar volume of substance (d) Mole fraction of substance
Problem 9
If a gas at constant temperature and pressure expands, then its: (a) Internal energy decreases (b) Entropy increases and then decreases (c) Internal energy increases (d) Internal energy remains constant
Problem 10
If a gas absorbs \(200 \mathrm{~J}\) of heat and expands by \(500 \mathrm{~cm}^{3}\) against a constant pressure of \(2 \times 10^{5} \mathrm{Nm}^{-2}\), then change in internal energy is: (a) - 200 J (b) \(-100 \mathrm{~J}\) (c) \(+100 \mathrm{~J}\) (d) \(+300 \mathrm{~J}\)
Problem 11
The internal energy of a substance does not depend upon: (a) Translational energy (b) Vibrational energy (c) Energy due to gravitational pull (d) Rotational energy
