### Class XI

Clausius statement of Second Law of Thermodynamics states that
1. No process is possible whose sole result is the transfer of heat from a hotter object to a colder object
2. Many processes are possible whose sole result is the transfer of heat from a colder object to a hotter object
3. No process is possible whose sole result is the transfer of work from a hotter object to a hotter object
4. No process is possible whose sole result is the transfer of heat from a colder object to a hotter object
Standard Molar Enthalpy of Formation is
1. The standard enthalpy change for the formation of one mole of a compound from its elements in their most stable states of aggregation
2. The standard enthalpy change for the formation of one mole of a compound from its elements in at a pressure of 2 bar and 25∘ C
3. The standard enthalpy change for the formation of one kg of a compound from its elements in their most stable states of aggregation
4. The standard enthalpy change for the formation of one mole of a compound from its elements in at a pressure of 10 bar and 30∘ C
A 1.0-kg bar of copper is heated at atmospheric pressure. If its temperature increases from 20∘∘C to 50∘∘C, what is the work done by the copper on the surrounding atmosphere? Given that for Cu 3α3α= 5.1 x 10-5 / C, ρCu=8.92×103Kg/m3
1. 1.7 ×× 10−210−2 J
2. 1.9 ×× 10−210−2 J
3. 1.6 ×× 10−210−2 J
4. 1.8 ×× 10−210−2 J
A power plant operates at 32.0 percent efficiency during the summer when the sea water for cooling is at 20.0∘∘C. The plant uses 350∘∘C steam to drive turbines. Assuming that the plant’s efficiency changes in the same proportion as the ideal efficiency, what would be the plant’s efficiency in the winter, when the sea water is at 10.0∘∘C?
1. 31percent
2. 34percent
3. 33percent
4. 32percent
wo cylinders A and B of equal capacity are connected to each other via a stopcock. A contains a gas at standard temperature and pressure. B is completely evacuated. The entire system is thermally insulated. The stopcock is suddenly opened. What is the final pressure of the gas in A and B?
1. 0.45 atm
2. 0.5 atm
3. 0.55 atm
4. 0.6 atm
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