For the reaction \( A \underset{\mathrm{k}_{2} \mathrm{sec}^{-1}}{\stackrel{\mathrm{sec}^{-1}}{2...

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For the reaction \( A \underset{\mathrm{k}_{2} \mathrm{sec}^{-1}}{\stackrel{\mathrm{sec}^{-1}}{2}} B \) following graph is given,
\( k_{1}=4 \times 10^{-2} \sec ^{-1} \). Which is/are correct statement (s) \( (\ln 2=0.7, \ln 8 / 7=0.14 \) )
(a) Equilibrium constant is \( 4.0 \)
(b) Time taken for the completion of \( 50 \% \) of equilibrium conc. of B is \( 14 \mathrm{sec} \).
(c) Time taken for the completion of \( 10 \% \) of initial conc. of A is \( 2.8 \mathrm{sec} \).
(d) Rate constant of backward reaction is \( 10^{-2} \mathrm{sec}^{-1} \)
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