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11. A reaction is 50% complete in 2 hours and 75% complete in 4 hours. What is the order of the reaction.

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12. The rate of reaction X → Y becomes 8 times when the concentration of the reactant X is doubled. Write the rate law of the reaction.

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13. State any one condition under which a bimolecular reaction may be kinetically of first order?

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14. The rate law for the decomposition of N₂O₅ is rate = k[N₂O₅]. What is the significance of k in this equation?

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15. Define activation energy of a reaction.

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16. Why is it that the instantaneous rate of reaction does not change when a part of the reacting solution is taken out?

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17. Express the rate of reaction in terms of concentration of reactants and products for the reaction.

2 N_{2} O_{5} (g) \to 4 {NO}_{2} (g) + O_{2} (g)

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18. For the hypothetical reaction:

A_{2} + 2 B_{2} \to 2 {AB}_{2},

write the rate equation in terms of the disappearance of B₂ and formation of AB_2.

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The relationship between the rate of production of water and the rate of disappearance of oxygen can be express as:

Rate = + \frac{1}{3} \frac{d [H_{2} O]}{dt} = - \frac{2}{7} \frac{d [O_{2}]}{dt}

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20. If the concentration is expressed in mol per litre and time in minutes, then write the units for the rate constant for n-th order reaction.

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