11th-revisiontest2

Revision Test Subject Teacher Class Batch

2(Thrmo, State of matter, Equili.)

Che Nitesh Gupta XIth Nucleus

1. What kind of system is the coffee held in a cup? [1]2. What will happen to internal energy if work is done by the system? [1]3. From thermodynamic point of view, to which system the animals and plants

belong?[1]4. How may the state of thermodynamic system be defined? [1]5. Define enthalpy. Give the mathematical expression of enthalpy. [1]6. Define Heat capacity .Define specific heat. Give the mathematical expression of heat

capacity. [1]7. Predict the sign of S for the following reaction

CaCo3 (s) ∆→

CaO5+CO2(g).[1]

8. Two ideal gases under same pressure and temperature are allowed to mix inan isolated system – what will be sign of entropy change?[1]

9. Give the relationship between U and H for gases. [3]10. It has been found that 221.4J is needed to heat 30g of ethanol from 150C to

180C. calculate (a) specific heat capacity, and (b) molar heat capacity ofethanol.[3]

11. The H and S for 2Ag2 O(s)4Ag(s) +O2 (g) are given + 61.17kJ mol-1and +132 Jk-1mol-1respectively. Above what temperature will the reaction beSpontaneous?[2]

12. A 1.25g sample of octane (C18 H18) is burnt in excess of oxygen in a bombcalorimeter. The temperature of the calorimeter rises from 294.05 to 300.78K.If heat capacity of the calorimeter is 8.93 KJ/K. find the heat transferred tocalorimeter.[2]

13. Calculate the heat of combustion of ethylene (gas) to from CO2 (gas) and H2O(gas) at 298k and 1 atmospheric pressure. The heats of formation of CO2, H2Oand C2H4 are – 393.7, - 241.8, + 52.3 kJ per mole respectively.[2]

14. Show that for an ideal gas Cp- Cv = R [2]15. What property of molecules of real gases is indicated by van der waal’s

constant ‘a’?[1]16. Under what conditions do real gases tend to show ideal gas behaviour? [1]17. How are Van der waal’s constants ‘a’ and ‘b’ related to the tendency to liquefy? [1]18. What is surface tension? What is its S.I unit? [1]19. How does surface tension change when temperature is raised? [1]20. Mention the two assumptions of kinetic theory of gases that do not hold good. [2]21. Calculate the pressure exerted by one mole of CO2 at 273 k if the Van der

waal’s constant a = 3.592 dm6 at m mol-1. Assume that the volume occupied byCO2 molecules is negligible.[2]

22. At 250C and 760 mm of Hg pressure a gas occupies 600ml volume. What will beits pressure at a height where temperature is 100C and volume of the gas is640mL.[2]

23. Calculate the volume occupied by 5.0 g of acetylene gas at 500C and 740mmpressure.[2]

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