CBSE Class 11 Chemistry VBQs Thermodynamics

UNIT – 6 (THERMODYNAMICS)

Question. The teacher taught in the class when an ideal gas expands, there is no change in temperature. On the other hand, when a real gas expands, cooling in produced. Ram, a student of the same class was curious to know its reason. The teacher explained the reason and Ram got satisfied.
(a) What would be the answer of the teacher?
(b) For a reaction both DH and DH are negative under what conditions the reaction occurs spontaneously?
(c) What values are displayed by Ram?

Question. In general, an exothermic reaction is thermodynamically spontaneous. Seema was curious to know under what circumstances and exothermic reaction may not be thermodynamically spontaneous. She discussed her problem with her friend Nidhi who explained her in detail and Seema got satisfied.
(a) What would be the answer of Nidhi?
(b) For a reaction both DH and DS are positive under what conditions the reaction occurs spontaneously?
(c) What values are displayed by Nidhi?

Question. While teaching the concept of irreversible process the teacher noticed that some students of the class are restless because they were unable to grasp the subject.Then she recited a nursery shyme “Humpty Dumpty sat on a wall, Humpty Dumpty had a great fall. All the king’s horse and all the king’s men could not put Humpty
(a) Dumpty together again”. The students became cheerful and convinced. Name two irreversible natural processes.
(b) Mention the value or values associated with the above process.

Question. Reversible process is slow but every slow process need not be reversible.
(a) Give an example with justification of a slow process which is not reversible.
(b) Write the associated value with your answer.

Question. Some thermodynamic properties are related in the same way as total money earned money paid as income tax and the money available for other purposes.
(a) Name these thermodynamic properties
(b) Write the relation or relations between these thermodynamic properties
(c) Mention the associated value with it.

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