The rate of a first order reaction has been found to be $2.45 \times 10^{- 6} m o l L^{- 1} s^{- 1}$ at concentration $C_{1}$ . The value of $C_{1}$ is (rate constant = $3.5 \times 10^{- 5}$ )

7 m o l L^{- 1}

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0.7 m o l L^{- 1}

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0.07 m o l L^{- 1}

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2.1 m o l L^{- 1}

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Solution

The correct option is C $0.07 m o l L^{- 1}$
$R a t e = k [C] 2.45 \times 10^{- 6} = 3.5 \times 10^{- 5} \times C_{1} o r, C_{1} = \frac{2.45 \times 10^{- 6}}{3.5 \times 10^{- 5}} = 0.07 m o l L^{- 1}$

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