19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
When 1 mol of an ideal gas is compressed to half of its volume, its temperature becomes double; then the change in entropy (S) would be:
Consider the reaction below at 298 K: C (graphite) + 2H₂ (g) → CH₄ (g) →fHº (kJ/mol) – 74.9 S₀ m(J/K/mol + 5.6 + 130.7 Which statement below is correct ?
Which of the following are extensive properties?
Assertion: For an isolated system, q is zero. Reason: In an isolated system, change in U and V is zero.
A diatomic gas at pressure P, compressed adiabatically to half of its volume, what is the final pressure?
If one monoatomic gas is expanded adiabatically from 2L to 10L at 1 atm external pressure then the value of U (in atm L) is
For which of the following cases H S T ?
What is the entropy change in 2 mol N₂, when its temperature is taken from 400 K to 800 K. at constant pressure?
Assertion: In isothermal process, whole of heat energy supplied to the system is converted into internal energy. Reason: According to the first law of thermodynamics U = q - w
Which thermodynamic parameter is not a state function?
The magnitudes of enthalpy changes for irreversible adiabatic expansion of a gas from 1L to 2L is H₁ and for reversible adiabatic expansion for the same expansion is H₂. Then
Match List I with List II and select the correct answer using the codes given below the lists: List – I List – II A. T G P
Find rH at 320 K for the reaction is:
1 mole of an ideal gas expands isothermally reversibly from 2 litre to 4 litre and 3 moles of the same gas expands from 2 litre to x litre and doing same work, what is ‘x’?
The heat liberated when 1.89g of benzoic acid is burnt in a bomb calorimeter at 25 °C and it increases the temperature of 18.94 kg of water by 0.632 °C. if the specific heat of water at 25 °C is 0.998 cal/g- °C, the v…
A liquid which is confined inside an adiabatic piston is suddenly taken from state 1 to state 2 by a single stage process. If the piston comes to rest at point 2 as shown. Then the enthalpy change for the process will…
Assertion: A reaction which is spontaneous and accompanied by decrease of randomness must be exothermic. Reason: All exothermic reactions are accompanied by decrease in randomness.
A system undergoes a 3-step process. In step 1, 25 J of work is done by the system as its internal energy (U) decreases by 50 J. In step 2, w = -15J and q = +40J. In step 3 at constant volume, the system gives off 50 …
Assertion: Entropy of system increases for a spontaneous reaction. Reason: Enthalpy of reaction always not decreases for spontaneous reaction.
A system undergoes a 2-step process. In step 1, 15 J of work is done on the system as its internal energy increases by a total of 30 J. In step 2, at constant volume, the system decreases its internal energy by 20 J. …
A diatomic gas at pressure P, compressed adiabatically to half of its volume, what is the final pressure?
Find r S at 320 K for the reaction is:
Assertion: In isothermal process, whole of heat energy supplied to the system is converted into internal energy. Reason: According to the first law of thermodynamics U = q - w
Assertion: For an isolated system, q is zero. Reason: In an isolated system, change in U and V is zero.
Assertion: There is no change in internal energy for an ideal gas at constant temperature. Reason: Internal energy of an ideal gas is a function of temperature only.