Activation Energy
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Q.
For an endothermic reaction, energy of activation is Ea and enthalpy of reaction is ΔH (both of these in kJ/mol). Minimum value of Ea will be:
Less than ΔH
Equal to ΔH
More than ΔH
Equal to zero
Q.
For an endothermic reaction, energy of activation is Ea and enthalpy of reaction is ΔH (both of these in kJ/mol). Minimum value of Ea will be:
Less than ΔH
Equal to zero
Equal to ΔH
More than ΔH
Q. Select the correct statement regarding activation energy:
- Activation energy may be greater than the heat of a reaction
- Activation energy is less than the threshold energy
- Rate of reaction is inversely proportional to activation energy
- All of these
Q. The forward and backward activation energy of exothermic reaction A→B is 80 and 280 kJ mol−1 respectively. The enthalpy change of the forward reaction A→B ( in kJ/mol) will be :
- -200
- -360
- -280
- -80
Q. Lindemann proposed the following detailed mechanism for gas phase isomerization, the reaction is
In the above scheme, A∗ is a molecule that has enough vibrational energy to decompose or isomerise. The Lindemann mechanism is followed by most of gas phase decomposition or isomerization reaction.
For the overall unimolecular isomerization of cyclopropane to propylene at , the values of versus concentration is as follows.
|M|Kunit |1M|1137.5 |2M|1131.25in s−1
If with the increase in temperature the overall rate increases, then the correct representation at a very high concentration of M is
In the above scheme, A∗ is a molecule that has enough vibrational energy to decompose or isomerise. The Lindemann mechanism is followed by most of gas phase decomposition or isomerization reaction.
For the overall unimolecular isomerization of cyclopropane to propylene at , the values of versus concentration is as follows.
|M|Kunit |1M|1137.5 |2M|1131.25in s−1
If with the increase in temperature the overall rate increases, then the correct representation at a very high concentration of M is
Q. Threshold frequency of a metal is f0. when light of frequency v=2f0 is incident on the metal plate, the maximum velocity of the electron that is emitted is v1. When the frequency of incident radiation is 5f0, and the maximum velocity of the emitted electron is v2, find the ratio v1v2.
- 1 : 4
- 1 : 2
- 1 : 1
- 1 : 32
Q. More than One Answer Type
एक से अधिक उत्तर प्रकार के प्रश्न
The purification of colloidal solution can be done by which of the following methods?
कोलॉइडी विलयन का शुद्धिकरण निम्नलिखित में से कौनसी विधियों द्वारा किया जा सकता है?
एक से अधिक उत्तर प्रकार के प्रश्न
The purification of colloidal solution can be done by which of the following methods?
कोलॉइडी विलयन का शुद्धिकरण निम्नलिखित में से कौनसी विधियों द्वारा किया जा सकता है?
- Electro-dialysis
विद्युत-अपोहन - Dialysis
अपोहन - Ultrafiltration
अतिसूक्ष्म निस्यंदन - van-Arkel method
वान-आर्केल विधि
Q.
The rate of a reaction doubles when its temperature changes form 300 K to 310 K. Activation energy of such a reaction will be (R=8.314 JK−1 mol−1 and log 2=0.301)
53.6 kj mol−1
48.6 kj mol−1
58.5 kj mol−1
60.5 kj mol−1
Q. For a first order reaction, A → P, the temperature (T) dependent rate constant (k) was found to follow the equation:
log k=2000T+6.0
the pre - exponential factor A and the activation energy Eα. respectively, are:
log k=2000T+6.0
the pre - exponential factor A and the activation energy Eα. respectively, are:
- 1.0×106 s−1 and 9.2 kJ mol−1
- 6.0 s−1 and 16.6 kJ mol−1
- 1.0×106 s−1 and 16.6 kJ mol−1
- 1.0×106 s−1 and 38.3 kJ mol−1
Q. For a first order reaction, A → P, the temperature (T) dependent rate constant (k) was found to follow the equation:
log k=2000T+6.0
the pre - exponential factor A and the activation energy Eα. respectively, are:
log k=2000T+6.0
the pre - exponential factor A and the activation energy Eα. respectively, are:
- 1.0×106 s−1 and 9.2 kJ mol−1
- 6.0 s−1 and 16.6 kJ mol−1
- 1.0×106 s−1 and 16.6 kJ mol−1
- 1.0×106 s−1 and 38.3 kJ mol−1