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Half life period of a first order reaction is 10 minutes. Starting with 10 M, rate after 20 minutes is

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Half life period of a first order reaction is 10 minutes. Starting with 10 M, rate after 20 minutes is
A. `0.0693"mol L"^(-1)min^(-1)`
B. `0.0693xx2.0"mol L"^(-1)min^(-1)`
C. `0.0693xx5"mol L"^(-1)min^(-1)`
D. `0.0693xx10"mol L"^(-1)min^(-1)`
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Correct Answer - B
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