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Q.

A certain substance A is mixed with an equimolar quantity of substance B. At the end of an hour A is 75% reacted. Calculate the time when A is 10% unreacted. (Given: order of reaction is zero).

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a

1.2 hours

b

2.1 hours

c

3.1 hours

d

2 hours

answer is A.

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Detailed Solution

K=xt x1t1=x2t2 751=90t2 t2=1.2 hrs
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