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Standard XII
Chemistry
Types of Elementary Reactions
Following dat...
Question

Following data are given for the reaction between A and B.

[A]/mol L−1[B]/mol L−1Initial rate/ mol L−1s−1 at
300 K		320 K
2.5×10−43.0×10−55.0×10−42.0×10−3
5.0×10−46.0×10−54.0×10−3-
1.0×10−36.0×10−51.6×10−2-
The rate constant at 300 K is:

A
2.67×108m−2s−1
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B
1.08×104m−2s−1
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C
3.52×109m−2s−1
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D
4.57×104m−2s−1
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Solution

The correct option is B 2.67×108m−2s−1
Let rate= K[A]x[B]y
⇒5×10−4=K[2.5×10−4]x[3×10−5]y......(1)
⇒4×10−3=K[5×10−4]x[6×10−5]y....(2)
⇒1.6×10−2=K[10×10−4]x[6×10−5]y....(3)
From (2) and (3), 14=(12)x⇒x=2
From (1) and (2), 18=(12)2(12)y⇒y=1
∴Rate=K[A]2[B]
∴5×10−4=K(2.5×10−4)2(3×10−5)⇒K=2.67×108m−2s−1

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Q.
Expt.
No.		 [A]
(molL−1)		 [B]
(molL−1) 		Initial rate (molL−1s−1)
300K 320K
(1) 2.5×10−4 3.0×10−5 5.0×10−4 2.0×10−3
(2) 5.0×10−4 6.0×10−5 4.0×10−3...
(3) 1.0×10−3 6.0×10−5 1.6×10−2...
From the data given above for the reaction between A and B, calculate the following:
(i) The order of the reaction with respect to A and with respect to B,
(ii) The rate constant at 300 K
(iii) The energy of activation and
(iv) The pre-exponential factor.
Q. Rate For the reaction A+B→products, what will be the order of reaction with respect of A and B?
Exp.[A](mol L−1)[B](mol L−1)Initial rate (mol L−1s−1)
1.2.5×10−43×10−55×10−4
2.5×10−46×10−54×10−3
3.1×10−36×10−51.6×10−2

Q.
From the following data answer the questions:
Reaction: A+B → P

[A] M[B] MInitial rateM sec−1
300 K400 K
2.5×10−43.0×10−55.0×10−42.0×10−3
5.0×10−46.0×10−54.0×10−3
1.0×10−36.0×10−51.6×10−2
The value of rate constant at 300 K is (m−2sec−1)
Q.
From the following data answer the questions:
Reaction: A + B → P

[A]M[B]MInitial rateM sec−1
300 K400 K
2.5×10−43.0×10−55.0×10−42.0×10−3
5.0×10−46.0×10−54.0×10−3
1.0×10−36.0×10−51.6×10−2

The order w.r.t A is:
Q.
From the following data answer the questions:
Reaction: A+B → P

[A]M[B]MInitial rateM sec−1
300 K400 K
2.5×10−43.0×10−55.0×10−42.0×10−3
5.0×10−46.0×10−54.0×10−3
1.0×10−36.0×10−51.6×10−2
The energy of activation for reaction (kJ/mol) is:
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