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NCERT Class XII Chemistry
Chapter - Chemical Kinetics
Questions with Solutions

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Question : 12
Total: 39
The reaction between A and B is first order with respect to A and zero order with respect to B. Fill in the blanks in the following table :
 Experiment  [A]∕molL−1  [B]∕molL−1  Initial rate/mol L−1min−1
 I  0.1  0.1  2.0×10−2
 II  –  0.2  4.0×10−2
 III  0.4  0.4  –
 IV   –  0.2  2.0×10−2
Solution:  
The reaction is first order with respect to A and zero order withrespect to B, hence the rate expression will be =k[A]1[B]0=k[A]
From expt. I: 2.0×10−2=k(0.1)
or, k=0.2 min−1
From expt. II: 4.0×10−2=(0.2)×[A]
⇒[A]=0.2 molL−1
From expt. III: Rate =(0.2)(0.4)=0.08 mol L−1 min−1
=8×10−2 mol L−1 min−1
From expt. IV: 2.0×10−2=(0.2)×[A]
⇒[A]=0.1 mol L−1
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