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Chemical Kinetics
Short Answer Type
61.
The reaction 2H
2
(g) + O
2
(g) --> 2H
2
O(g) is feasible. How is that hydrogen and oxygen mixture allowed to stand at room temperature shows no formation of water at all?
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62.
For reaction NO
2
+ CO → CO
2
+ NO, the rate law is Rate = k[NO
2
]
2
. How many molecules of CO are involved in slowest process?
Rate = k[NO
2
]
2
No molecules of CO are involved in slowest step because CO is not present in rate law.
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63.
State any one condition under which a bimolecular reaction may be kinetically of first order.
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64.
Why is instantaneous rate preferred over average rate of reaction?
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65.
The rate constant of a reaction is 3 x 10
2
h
–1
. What is the order of reaction?
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66.
A spontaneous reaction is not necessarily a fast reaction. Why?
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67.
A order of reaction is found to be zero. Will its molecularity be zero?
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68.
How is half period related to initial concentration for a second order reaction?
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69.
In some cases it is found that a large number of colliding molecules have energy more than threshold value, yet the reaction is slow. Why?
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70.
Define activation energy of a reaction.
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