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41. What is the rate and order of a reaction of the mechanism is

2 NO + H_{2} \to N_{2} + H_{2} O_{2} (slow)

Following by

H_{2} O_{2} + H_{2} \to 2 H_{2} O

(fast)

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42. Define the order of a reaction.

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43. Define first order reaction. What are its units?

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44. Define second order reaction? Give one example and units of K.

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45. In some cases it is found that a large number of colliding molecules have energy more than threshold value, yet the reaction is slow. Why?

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46. How does the value of rate constant vary with reactant concentration?

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47. A substance with initial con-centration ‘a’ follows zero order kinetics. In how much time will the reaction go to complet-ion?

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48. The reaction A + B → C has zero order. What is the rate equation?

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The rate constant of the reaction increases with increase in temperature.

k = {Ae}^{- Ea / RT}

is quantitative relationship between rate constant and temperature.

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50. What is the shape between log k vs

\frac{1}{T}

?
What is the relationship between its slope and activation energy (Ea) ?

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