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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 chemical reaction: `Ararr` Product, the rate of disappearance of `A` is given by: `(-dC_(A))/(dt)=K_(1) (C_(A))/(1+K_(2)C_(A))`. At low `C_(A)`, the order of reaction and rate constants are respectively:A. (a) `I, K_(1)/K_(2)`B. (b) `I, K_(1)`C. (c ) `II, K_(1)/K_(2)`D. (d) `II, K_(1)/(K_(1)+K_(2))` |
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Answer» Correct Answer - b `-(dC_(A))/(dt)=(K_(1)C_(A))/(1+K_(2)C_(A)), if C_(A)= low` `1+K_(2)C_(A)=1` `:. (dC_(A))/(dt)=K_(1)C_(A)` |
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