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Statement I : Half life period of first order reaction is independent of concentration of the reactant

Statement II : 99.9% reaction of first order reaction completes in 10 half lives

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Both statement - I and II are incorrect

Statement I and II are correct and II does not explain I

Statement I and II are correct and II explains I

Statement - I is correct and Statement - II is incorrect

answer is B.

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Detailed Solution

For first order reaction

$t_{0.5} = \frac{0.693}{K_{1}}$ no concentration term ,independent of concentration

$\frac{2.303 \times 0.3010}{t_{0.5}} = \frac{2.303}{t_{99.9}} \log \frac{100}{100 - 99.9} simplifying t_{99.9} = 10 t_{0.5}$

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