First Order Reaction MCQ - Practice Questions with Answers

unit of must be s^-1

  is a constant

rate of formation of C is twice the rate of disappearance of A

value of k is independent of the initial concentrations of A  and  B

1 /4 of the original amount

1/8 of the original amount

1/16 of the original amount

1/ 32 of the original amount

Cyclopropane $\longrightarrow$ propane

Cis - But $-2-$ ene $\longrightarrow$ Trans - but $-2-$ ere

Vinyl allyl ether $\rightarrow$ pent $-4-$ enal

$\mathrm{H}_2(\mathrm{~g})+\mathrm{Cl}_2(\mathrm{~g}) \xrightarrow{\mathrm{h} \nu}, 2 \mathrm{HCl}(\mathrm{g})$

$693 \mathrm{~mol} \mathrm{~min}^{-1}$

$693 \mathrm{~mol} \mathrm{~min}^{-1}$

$0.693 \mathrm{~mol} \mathrm{~min}^{-1}$

$2.5 \mathrm{~mol} \mathrm{~min}^{-1}$

Inversion of sucrose in the presence of Acid.

Oxidation of $\mathrm{I}^{-}$ion by $\mathrm{S}_2 \mathrm{O}_8^{2-}$ ion.

Decomposition of $\mathrm{NH}_3$ in the presence of Mo or W.

Decomposition of HI on the gold surface.

$\mathrm{Kt}=(\mathrm{A})_0-(\mathrm{A})_{\mathrm{t}}$

$[\mathrm{A}]_0=(\mathrm{A})_{\mathrm{r}} \mathrm{e}^{-\mathrm{kt}}$

$(\mathrm{A})_{\mathrm{t}}=[\mathrm{A}]_0 \mathrm{e}^{-\mathrm{kt}}$

None of these

$\mathrm{kt}=2.303 \log \left(\frac{\mathrm{~A}_0}{\mathrm{~A}}\right)$

$\mathrm{A}=\mathrm{A}_0 \mathrm{e}^{-\mathrm{kt}}$

$\mathrm{kt}=\ln \left(\frac{\mathrm{A}_0}{\mathrm{~A}}\right)$

$(\mathrm{A})_0-(\mathrm{A})_{\mathrm{t}}=\mathrm{kt}$

$3.125 \%$

$6.25 \%$

$12.5 \%$

$25 \%$