Dell Uompletes the statement or answers the question. 1. The efficiency of heat

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Dell Uompletes the statement or answers the question. 1. The efficiency of heat engine is maximum when, 8. A closed flask contains water in all its three states (a) Temperature of source temperature of sink solides, liquid and vapour at 0°C. In this situation the Temperature of sink temperature of source average KE of the water molecule (c) Temperature difference of source will be (d Temperature and sink is maximum (a) in vapour state difference of source and sink is (b) Maximum in solid state (c) Greater in the liquid than in vapour state (d) Same in all the three states 2. Entopy change of vaporisation at constant 9. At constant pressure and temperature. The pressure is given by direction of any chemical reaction is one where, the decrease (a) Entropy (b Enthalpy (d None (c) Gibbs free energy (d) None 3. Which of the following best describes the relations 10. Human body is an example of hip between two systems in thermal equilibrium? (a open system (b) Closed system (a) No net energy is exchanged. (e)The masses are equal Isolated system (d) None t) The volumes are equal. (d) The velocity is zero. 4. Change is entropy for a reaction is given by 11. Which has the least entropy (a Graphite (b) Diamond (a) 2.303 nR logio V2/vt (c) N2(g) (d) All (c) nR log. P /P 12. Equilibrium constant of a reaction is related to 5. The heat measured for a reaction in a bomb (a) Standard free energ change AG calorimeter is (b) Free energy change AG (b AH (a) AG (c) Heat enthalpy (d) None Answer: 6. Which of the following is a direct cause of a 13. When the value of entropy is greater, then theability for work is: substance's temperature increase? (a Maximum (a) Energy is removed from the particles of the substance. (c Medium (d) None of these (b) Kinetic energy is added to the particles of the (c) he number of atoms and molecules in a substance changes substance decreases. (dy The volume of the Annam aht Al-Ansari

Explanation / Answer

1-a,2-b,3-a,4-c,5-b,6-b,8-c,9-d,10-b,11-b,12-b,13-a

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