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A heat engine absorbs heat at temperature and heat at temperature , work done by the engine is this data:
(a)Violates 1st law of thermodynamics
(b)Violates 1st law of thermodynamics if is ve
(c)Violates 1st law of thermodynamics if is ve
(d)Does not violate 1st law of thermodynamics

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Important Questions on Thermodynamics
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(R = 8.314 J/mol K) (ln7.5 = 2.01)

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The specific heat of a certain substance is . Assuming ideal solution behavior, the energy required (in ) to heat of molal of its aqueous solution from to is closest to :
[Given: molar mass of the substance ; specific heat of water ]

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of nitrous oxide gas is cooled at a constant pressure of atm from to causing the compression of the gas from to . The change in internal energy of the process, is . The value of is _____.
[nearest integer]
(Given: atomic mass of and of . Molar heat capacity of is )

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The above diagram represents the thermodynamic cycle of an engine, operating with an ideal mono-atomic gas. The amount of heat, extracted from the source in a single cycle, is:

