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प्रश्न
Write a condition under which a bimolecular reaction is kinetically first order. Give an example of such a reaction. (Given : log2 = 0.3010,log 3 = 0.4771, log5 = 0.6990).
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उत्तर
\[\ce{ C_12 H22O11 + H2O ->[H+] C6 + \underset{Glucose}{C6H12O6} + \underset{Fructose}{C6H12O6} }\] Rate=K[C12H22O4]
Biomolecular reaction is Kinetically first order. Consider a chemical reaction between two substances when one reactanct is present in large excess.
`CH_3 COOC_2H5 +H_2O -> CH_3OOH + C_2H_5OH`
t=0 0.01mol 10mol 0 0
t 0mol 9.9mol 0.01 0.01 mol
Rate = K[CH3COOC2H5]
`Rate = K[CH_3COOC_2H_5] where K=K' [H2O]` the reaction behaves as first order reactions.
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संबंधित प्रश्न
The rate constant of a first order reaction increases from 4 × 10−2 to 8 × 10−2 when the temperature changes from 27°C to 37°C. Calculate the energy of activation (Ea). (log 2 = 0.301, log 3 = 0.4771, log 4 = 0.6021)
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(i) energy is always released
(ii) energy is always absorbed
(iii) energy does not change
(iv) reactants may be formed
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(i) Catalyst provides an alternative pathway to reaction mechanism.
(ii) Catalyst raises the activation energy.
(iii) Catalyst lowers the activation energy.
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| Column I | Column I | |
| (i) | Catalyst alters the rate of reaction | (a) cannot be fraction or zero |
| (ii) | Molecularity | (b) proper orientation is not there always |
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| (iv) | `e^((-E_a)/(RT)` | (d) is same as the first |
| (v) | Energetically favourable reactions (e) total probability is one are sometimes slow | (e) total probability is one |
| (vi) | Area under the Maxwell Boltzman curve is constant | (f) refers to the fraction of molecules with energy equal to or greater than activation energy |
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