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135. What is the difference between order and molecularity of a reaction?

Molecularity	Order of a reaction
1. It is the total number of molecules of the reactants taking part in a single step of the reaction.	1. It is the sum of the indices to which the concentration terms are raised in rate equation, for the reaction.
2. It is always a whole number.	2. It may be a whole number, a fraction or zero.
3. It is obtained from the simple balanced chemical equation.	3. It is obtained through experimentation and is dependent upon the rate for the overall reactions.
4.It is theoretical concept.	4. It is experimental quantity.

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Long Answer Type

136. What are Pseudo chemical reaction? Give examples.

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Short Answer Type

137. A reaction is first order in A and second order in B.
(i) Write differential rate equation.
(ii) How is the rate affected if the concentration of B is tripled?
(iii) How is the rate affected when the concentrations of both A and B are doubled?
What is the significance of rate constant in the rate expression?

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138. Following reaction takes place in one step:

2 NO (g) + O_{2} (g) ⇋ 2 {NO}_{2} (g)

How will the rate of the above reaction change if the volume of the reaction vessel is diminished to one third of its original volume? Will there be any change in the order of the reaction with the reduced volume ?

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139. Two similar reactions have the same rate constant at 25°C, but at 35°C one of the reaction has a higher rate constant than the other. Account for these observations.

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Long Answer Type

140. How will you verify whether a reaction is first order or not?

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