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The reaction is
  • a)
    bimolecular and of second order
  • b)
    unimolecular and of first order
  • c)
    bimolecular and of first order
  • d)
    bimolecular and of zero order
Correct answer is option 'C'. Can you explain this answer?
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The reaction isa)bimolecular and of second orderb)unimolecular and of...
Understanding the Reaction
The given reaction is represented as:
2NO → 2NO + O
This reaction involves the breaking of bonds and the formation of products, which can help us determine its molecularity and order.
Defining Bimolecular and Unimolecular Reactions
- Unimolecular Reactions: Involves a single reactant molecule going through a transformation.
- Bimolecular Reactions: Involves two reactant molecules colliding to form products.
In this case, since there are two NO molecules participating in the reaction, it is classified as bimolecular.
Order of the Reaction
- First Order: The rate of the reaction depends linearly on the concentration of one reactant.
- Zero Order: The rate of reaction is independent of the concentration of reactants.
In the reaction 2NO → 2NO + O, the rate can be expressed as:
Rate = k[NO]^2
This indicates that the reaction rate is proportional to the square of the concentration of NO, confirming it is first order with respect to NO.
Conclusion
Given that the reaction is bimolecular (involving two NO molecules) and exhibits first-order kinetics with respect to the concentration of NO, the correct answer is:
Option C: bimolecular and of first order.
This understanding is crucial for further studies in chemical kinetics, especially for competitive exams like JEE.
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The reaction isa)bimolecular and of second orderb)unimolecular and of...
It is bimolecular first order reaction since Rate ]
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There are many reactions which obey a first order rate equation although it reality they are bi- or ter-molecular. As an example of these may be taken the decomposition of Carbonyl sulfide in water, namely, COS + H20 002 + H2SAccording to the law of mass action this reaction should be second order with the rate dependent on the concentration of both the carbonyl sulfide and the water. Actually however, the rate is found to be first order with respect to the carbonyl sulfide and independent of the water Reactions exhibiting such behaviour are said to be pseudo-molecular.The pseudo-unimoecuar nature of this reaction is explainable by the fact that water is present in such excess that its concentration remains practically constant during the course of the reaction. Under these condition b x = b, and the rate equation becomesOn integration this leads towhich is the equation for a first order reaction. It is evident, however, that the now constant k is not independent of the concentration, as is the case with true first order constants, but may vary with b if the latter is changed appreciably, When such is the case, the true constant k2 can be obtained from k by dividing the latter by b. pseudo-molecular reactions are encountered whenever one or more of the reactants remain constants during the course of an experiment. This is the case with reactions conducted in solvents which are themselves one of the reactants, as in the decomposition of carbonyl sulfide in water, or in the esterification of acetic anhydride in alcohol(CH3C0)20 + 2C2H5OH 2CH3C00C2H5 + H20Again, this is also true of reactions subject to catalysis, in which case the concentration of the catalyst does not change. The decomposition of diacetone alcohol to acetone in aqueous solution is catalysed by hydroxyl ions, with the rate proportional to the concentration of the alcohol and that of the base. Since the concentration of the base does not change within any one experiment, however, the rate equation reduces to one of first order with respect to the alcohol. But the rateconstant k obtained for various concentrations of base are not identical, as may be seen from table. To obtain from these the true second order velocity constant, the ks must be divided by the hydroxyl ion concentration. When this is done excellent k2 values result, as column 3 indicatesTable : Decomposition of diacetone alcohol in water at 25C (Catalyst : NaOH)Q.By what factor does the rate of reaction of diacetone alcohol in water solution change if p0H is increased by 2 units other things remaining same ?

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The reaction isa)bimolecular and of second orderb)unimolecular and of first orderc)bimolecular and of first orderd)bimolecular and of zero orderCorrect answer is option 'C'. Can you explain this answer?
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