The reaction : A rarr B follows first or...

The reaction : A `rarr` B follows first order kinetics. The time taken for 0.8 mol of A to produce 0.6 mol of B is 1 hour. What is the time taken for Conversion of 0.9 mol of A to produce 0.675 mol of B ?

1 hour

0.5 hour

0.25 hour

2 hour

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