Among the following,the $INCORRECT$ statement regarding the collision theory of chemical reaction is:

  • A
    The reactant molecules are assumed to be hard spheres.
  • B
    Collision frequency between reactants is one of the factors that determines the rate of the reaction.
  • C
    The steric factor takes into account the relative orientation of the reactant molecules during collisions.
  • D
    The theory takes into account the structural aspects of the molecules during collision.

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The first order rate constant for the decomposition of $CaCO_3$ at $700 \ K$ is $6.36 \times 10^{-3} \ s^{-1}$ and activation energy is $209 \ kJ \ mol^{-1}$. Its rate constant (in $s^{-1}$) at $500 \ K$ is $x \times 10^{-6}$. The value of $x$ is ..... (Nearest integer)
Given $R=8.31 \ J \ K^{-1} \ mol^{-1} ; \log(6.36 \times 10^{-3})=-2.19 ; [10^{-4.79}=1.62 \times 10^{-5}]$

The rate constants for the decomposition of acetaldehyde have been measured over the temperature range $700-1000 \ K$. The data has been analysed by plotting a $\ln \ k \ vs \ \frac{10^{3}}{T}$ graph,which gives a slope of $-18.5$. The value of activation energy for the reaction is $...... \ kJ \ mol^{-1}$. (Nearest integer) (Given: $R = 8.31 \ J \ K^{-1} \ mol^{-1}$)

Activation energy of a chemical reaction can be determined by

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