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Q.

For the chemical reaction A+B+CKD, it was found that the rate of the reaction doubled when the concentration of B was doubled, that the rate of reaction doubled when the concentration of both A and B were doubled, and quadrupled when the concentration of both B and C were doubled. The order of the reaction is

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a

2

b

6

c

3

d

4

answer is A.

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Detailed Solution

For the chemical reaction  y+z=2A+B+CKD, let us assume rate law for the given reaction.

r=KAxByCz

2r1=KAx2ByCz

21r1=2yKAxByCz

21r1=2yr

2y=21

y=1

4r2=KAx2By2Cz

22r2=KAxByCz.2y.2z

22r2=r.2y+Z

22=2y+z

1+Z=2

Z=1

2r3=K2Ax2ByCz

21r3=K2Ax2ByCz.2x.2y

21r3=KAxByCz.2x+y

21=2x+y

1=x+y

x+y=1

x+1=1

x=1-1=0

x=0

r=KA0B1C1

The order of reaction

=0+1+1=2

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