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Q.

The half life of a first order reaction is 2000 years. If the concentration after 8000 years is 0.02M, then the inital concentration was.

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a

0.16M

b

0.08M

c

0.04M

d

0.32M

answer is B.

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Detailed Solution

For first order reaction, concentration present after nt12=a2n
a = Initial concentration
n = no . of t1/2
n=80002000=4a24=0.02a=0.32M

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