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InterviewSolution
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The rate of reaction `((dx)/(dt))` varies with nature, physical state and concentration of reactants, temperature, exposure to light and catalyst, whereas rate constant `(K)` varies with temperature and catalyst only. The rate constant `K` is given as `K=Ae^(-E_(a)//RT)` where `A` is Arrhenius parameter or pre-exponential factor and `E_(a)` is energy of activation. The minimum energy required for a reaction is called threshold energy and the additional energy required by reactant molecules to attain threshold energy level is called energy of activation. For a reversible reaction, `A+B hArr C+D, DeltaH=-A kcal`. If energy is `B` kcal, the energy of activation for backward reaction in kcal is:A. (a) `-A+B`B. (b) `A+B`C. (c ) `A-B`D. (d) `-A-B` |
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Answer» Correct Answer - b `E_(a_(f))-E_(a_(b))=DeltaH` `B-E_(a_(b))=-A` `:. E_(a_(b))=A+B` |
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