19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
In endothermic reactions,
The densities of graphite and diamond at 298 K are 2.25 and 3.31 g cm–3, respectively. If the standard free energy difference is equal to 1895 J mol–1, the pressure at which graphite will be transformed into diamond a…
What is the entropy change in JK–1 mol–1 when one mole of ice is converted into water at 0°C? (The enthalpy change for the conversion of ice to liquid water is 6.0 kJ mol–1 at 0°C)
Which one among the following is the correct option for right relationship between CP and CV for one mole of ideal gas? (NEET 2021)
Which law states that entropy of all pure crystalline solids is zero at absolute zero?
Identify the correct statement regarding entropy.
Thermodynamically, the most stable form of carbon
The heat of formation of Fe O s is –824.2 kJ mol–1. ∆H for the reaction. 2Fe O s 4Fe s 3O g → is:
For the reaction, 2H O g 2H g O g → ∆H = 571.6 KJ fH of water is :
The following data is known about the melting of a compound AB. ∆H = 9.2 kJ mol–1. ∆S = 0.008 kJ K–1mol–1. Its melting point is :
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?
The work done during the expansion of a gas from a volume of 4 dm3 to 6 dm3 against a constant external pressure of 3 atm is (1 L atm = 101.32J) (2004)
Entropy of the universe is
Which of the following processes is a non-spontaneous process?
Entropy is a measure of
The statement “The change of enthalpy of a chemical reaction is same whether the reaction takes place in one or several steps” is
In an adiabatic expansion of ideal gas
In thermodynamics a process is called reversible when
When ice melts into water, entropy
Which of the following statements is not correct?
In an isothermal expansion of an ideal gas
A system absorbs 10 kJ of heat and does 4 kJ of work. The internal energy of the system
Regarding the internal energy of the molecule, which of the following statement is correct?
Internal energy is the sum of
Which of the following processes is reversible?