19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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. …
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’?
Assertion: Addition of Q and w gives ΔU. Reason: Addition of two path functions cannot give state function.
Bond dissociation energy of CH₄ is 360 kJ/mol and C₂H₆ is 620 kJ/mol. Then bond dissociation energy of C – C bond is
B. P G T 2. T C. P H S 3. -S D. H T P 4. P 5. V
Assertion: The extensive properties of a single pure substance will not only depend upon the number of moles of the substance present but also on any two of the three variables. Reason: Any extensive property if expre…
G T S when H
In a reaction, all reactant and products are liquid, then (a) H E (b) H E (c) H E
For a sample of perfect gas when its pressure is changed isothermally from pi to pf, the entropy change is given by. (NEET-II 2016)
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.
Thermodynamics deals with
Which of the following macroscopic variable is not measurable?
Which of the following is an example of open system?
Closed system can exchange (with surroundings)
Which of the following quantities is not a state function?
Which of the following is not a state function?
Which of the following is a state function?
Which of the following is a path function?
Which of the following is a state function and also an extensive property?
Which of the following is intensive property?
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
What is the entropy change in 2 mol N₂, when its temperature is taken from 400 K to 800 K. at constant pressure?
In an isobaric process, when temperature changes from 1T to T , S is equal to
Reversible expansion of an ideal gas under isothermal and adiabatic conditions are as shown in the figure. AB → Isothermal expansion AC → Adiabatic expansion Which of the following options is not correct? (Odisha NEET…