19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Which of the following statements is not correct?
The standard free energy change G is related to K (equilibrium constant) as
Entropy is a measure of
Which law states that entropy of all pure crystalline solids is zero at absolute zero?
2 moles of ideal gas at 27°C temperature is expanded reversibly from 2 lit. to 20 lit. find entropy change. (R = 2 cal/mol K)
Identify the correct statement regarding entropy.
Thermodynamically, the most stable form of carbon
In an adiabatic expansion of ideal gas
In thermodynamics a process is called reversible when
The statement “The change of enthalpy of a chemical reaction is same whether the reaction takes place in one or several steps” is
When ice melts into water, entropy
A system absorbs 10 kJ of heat and does 4 kJ of work. The internal energy of the system
In an isothermal expansion of an ideal gas
Which of the following processes is reversible?
Internal energy is the sum of
Which of the following processes is irreversible?
Entropy of the universe is
Tea placed in thermos flask is an example of
A thermally isolated gaseous system can exchange energy with the surroundings. The mode of energy may be
Which is included in thermodynamic equilibrium from the following?
In which of the following cases, the reaction is spontaneous at all temperatures ?
G is the net energy available to do useful work and is a measure of free energy. If a reaction has positive enthalpy change and positive entropy change, under what conditions will the reaction be spontaneous?
Regarding the internal energy of the molecule, which of the following statement is correct?
Which of the following processes is a non-spontaneous process?
For a reaction: X → Y + Z absolute entropies are X = 120 JK–1 mol–1 Y = 213.8 JK–1 mol–1 and Z = 197.9 JK–1 mol–1. What will be the entropy change at 298 K and 1 atm?