A) 3yr
B) 4yr
C) 8yr
D) 24yr
Correct Answer: B
Solution :
\[[R]=\frac{{{[R]}_{0}}}{{{2}^{n}}}\] \[\therefore \] \[1.25=\frac{10}{{{2}^{n}}}\]or\[{{2}^{n}}=\frac{10}{1.25}=8={{2}^{3}}\] Hence, \[n=3\] 3 half-lives \[=12\,yr\]or \[{{t}_{1/2}}=4\,yr\]You need to login to perform this action.
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