A) \[8.0\,\times {{10}^{8}}s\]
B) \[2.0\,\,\times \,\,1{{0}^{-}}^{8}s\]
C) \[6.0\,\,\times \,\,1{{0}^{-}}^{6}s\]
D) \[2.0\,\,\times \,\,1{{0}^{-}}^{2}s\]
Correct Answer: B
Solution :
\[[{{H}^{+}}]\,\,=\,\,\frac{6\times {{10}^{-\,7}}mol}{5\times {{10}^{-\,5}}\,L}\,\,=\,\,1.2\times {{10}^{-\,2}}\,M\] \[rate=\frac{dx}{dt}\,\,or\,\,dt=\frac{dx}{rate}=\frac{1.2\times {{10}^{-\,2}}M}{6\times {{10}^{5}}M{{s}^{-\,1}}}\] \[dt=\frac{dx}{rate}=\frac{(1.2\times {{10}^{-\,2}})}{6\times {{10}^{5}}M{{s}^{-1}}}\] \[dt\,\,=\,\,2\times 1{{0}^{-\,8}}\,s\]
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