21.Under what condition, a reversible process becomes irreversible ?
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22.Give two important characteristics of the equilibrium constant.
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23.Give the equilibrium constant for the following equilibrium in terms of partial pressures:
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24.What is the relation between Kp and Kc?
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25.Under what condition in a reversible reaction is Kp = Kc?
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26.Predict which of the following reaction will have appreciable concentration of reactants and products:
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27.PCl5, PCl3 and Cl2 are at equilibrium at 500K and having concentration 1·59M PCl3, 1·59M Cl2 and 1·41 M PCl5. Calculate Kc for the reaction:
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28.A quantity of PCl5 was heated in a 10 litre vessel at 250°C. At equilibrium the vessel contains 0.1 mole of 0.20 mole of and 0.20 mole of Cl2. What is the value of equilibrium constant of the reaction?
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29.At equilibrium, the concentration of N2 = 3·0 × 10–3 M, O2 = 4·2 × 10–3 M and NO = 2·8 × 10–3 M in a sealed vessel at 800K. What will be Kc for the reaction:
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30.The following concentrations were obtained for the formation of NH3 from N2and H2 at equilibrium at 500K. [N2] = 1·5 × 10–2 M, [H2] = 3·0 × 10–2M and [NH3] = 1·2 × 10–2 M. Calculate the equilibrium constant.
Short Answer Type
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At equilibrium the vessel contains 0.1 mole of 
0.20 mole of 
and 0.20 mole of Cl2. What is the value of equilibrium constant of the reaction?
