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प्रश्न
For a complex reaction:
(i) order of overall reaction is same as molecularity of the slowest step.
(ii) order of overall reaction is less than the molecularity of the slowest step.
(iii) order of overall reaction is greater than molecularity of the slowest step.
(iv) molecularity of the slowest step is never zero or non interger.
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उत्तर
(i) order of overall reaction is same as molecularity of the slowest step.
(iv) molecularity of the slowest step is never zero or non interger.
Explanation:
(i) For a complex reaction, order of overall reaction = molecularity of slowest step. As rate of overall reaction depends upon total number of molecules involved in slowest step of the reaction. Hence, molecularity of the slowest step is equal to order of overall reaction.
(ii) Since the completion of any chemical reaction is not possible in the absence of reactants. Hence, slowest step of any chemical reaction must contain at least one reactant. Thus, molecularity’of the slowest step is never zero or non-integer.
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संबंधित प्रश्न
For a reaction: 
Rate = k
(i) Write the order and molecularity of this reaction.
(ii) Write the unit of k.
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\[\ce{2A + B → A2B}\]
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\[\ce{A(g) -> B(g) + C(g)}\]
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Match the graph given in Column I with the order of reaction given in Column II. More than one item in Column I may link to the same item of Column II.
| Column I | Column II | |
| (i) |  |
|
| (ii) |  |
(a) 1st order |
| (iii) |  |
(b) Zero-order |
| (iv) |  |
Assertion: Order and molecularity are same.
Reason: Order is determined experimentally and molecularity is the sum of the stoichiometric coefficient of rate determining elementary step.
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`1/("A"_"t"^4) = 2 + 1.5 xx 10^-3` t
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Reason (R): For a complex reaction, molecularity has no meaning.
