The rate constants for decomposition of acetaldehyde have been measured over the temperature range $700-1000$ K. The data has been analysed by plotting $\ln k$ vs $\frac{10^3}{T}$ graph. The value of activation energy for the reaction is ______ $\mathrm{kJ\ mol^{-1}}$. (Nearest integer) (Given : $R=8.31\ \mathrm{J\ K^{-1}\ mol^{-1}}$)

JEE Main 2022 · ChemistryNumerical answerNumerical valueEasyData or graph

JEE Main 24 June 2022, Shift 1, Chemistry Q85

Question 85 of 90 in this shift, Chemistry question 25 of 30, Section B.

The rate constants for decomposition of acetaldehyde have been measured over the temperature range

700-1000

K. The data has been analysed by plotting

\ln k

\frac{10^3}{T}

graph. The value of activation energy for the reaction is ______

\mathrm{kJ\ mol^{-1}}

. (Nearest integer) (Given :

R=8.31\ \mathrm{J\ K^{-1}\ mol^{-1}}

)

The figure, in words

Graph of ln k (y-axis) vs 10^3/T (x-axis): straight line with negative slope, labelled Slope = -18.5.

Official answer

154

NTA final key (2022 Session 1).