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Q.

A substance 'A' decomposes in solution following the first order kinetics. Flask I contain 1 L of 1 M solution of A and flask II contains 100 ml of 0.6 M solution. After 8 hr, the conc. Of A in flask 1 becomes 0.25 M. What will be time for cone. Of A in flask II to become 0.3 M?

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a

2.4 hr

b

unpredictable as rate constant is not given

c

4.0 hr

d

0.4 hr

answer is C.

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Detailed Solution

We know that

kt=ln A0[A],

On putting the values we get,

k×8=ln⁡10.25k=(1/8)ln⁡10.25

Now, time for cone. Of A in flask II to become 0.3 M

k×t=ln⁡0.60.3 ⇒t=4 hrs

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