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Question

The reaction AB follows first order kinetics. The time taken for 0.8 mole of A to produce 0.6 mole of B is 1h. What is the time taken for conversion of 0.9 mole of A to produce 0.675 mole of B?

A
0.25h
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B
2h
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C
1h
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D
0.5h
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Solution

The correct option is C 1h
k=2.303tlogA0At
or k=2.3031log0.80.2....(i)

Remaining moles of A=0.90.675
=0.225

k=2.303t1log0.90.225....(ii)

From eq. (i) and (ii)

2.3031log0.80.2=2.303t1log0.90.225
t1=1h

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