A) 5 hours
B) 7.5 hours
C) 10 hours
D) 20 hours
Correct Answer: B
Solution :
\[k=\frac{0.693}{0.75\text{hr}}=\frac{\text{2}\text{.303}}{\text{t}}\log \frac{a}{a-0.999a}\] \[=\frac{2.303}{t}\log {{10}^{3}}=7.5\,hrs\].You need to login to perform this action.
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