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Byju's Answer
Standard XII
Chemistry
Factors Affecting Rate of Reaction
ntIf activati...
Question
ntIf activation energy of reaction decreases by 5.727kJ when catalyst is used at 27^°C the increase in rate of reaction is A18 times B 10 times C 8 times D 20 timesn
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Q.
The rate at
27
o
C
of a chemical reaction increases
1000
times when a suitable catalyst is introduced. Calculate the change in the energy of activation that the catalyst has brought in.
Q.
(a) What is rate of reaction? Write two factors that affect the rate of reaction.
(b) 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
(
E
a
)
. (log 2 =0.301, log 3 =0.4771, log 4 =0.6021)
Q.
In presence of a catalyst, the activation energy is lowered by 3 kcal at
27
o
C
. Hence, the rate of reaction will increase by:
Q.
A first order reaction is
50
%
complete in 200 hrs at
27
∘
C
and in 20 hrs at
27
∘
C
in presence of catalyst. The
decrease in activation energy caused by catalyst is nearly
Q.
The rate constant of a reaction is
1.5
×
10
−
3
a
t
25
∘
C
a
n
d
2.1
×
10
−
2
a
t
60
∘
C
. The activation energy is:
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