Write about elementary and complex reactions.
Write about elementary and complex reactions.
A balanced chemical equation never gives us a true picture of how a reaction takes place.
$(a)$ Elementary reaction : The reactions taking place in one step are called elementary reactions. The order of reaction in elementary is equal to molecularity.
$(b)$ Complex reaction : When a sequence of elementary reactions (called mechanism) gives us the products, the reactions are called complex reactions.
The complex reactions involving more than three molecules in the stoichiometric equation must take place in more than one step.
For complex reaction the order is given by the slowest step and molecularity of the slowest step is same of the order of the overall reaction.
Examples: $(i)$ The oxidation of ethane to $\mathrm{CO}_{2}$ and $\mathrm{H}_{2} \mathrm{O}$ passes through a series of a intermediate steps in which alcohol, aldehyde and acid are formed. $(ii)$ Reverse reactions and side reactions (e.g. nitration of phenol yields o-nitrophenol and $p$-nitrophenol)..
Similar Questions
Reaction : $KCl{O_3} + 6FeS{O_4} + 3{H_2}S{O_4} \to $ $KCl + 3F{e_2}{\left( {S{O_4}} \right)_3} + 3{H_2}O$
Which is True $(T)$ and False $(F)$ in the following sentence ?
The reaction is elementary.
Reaction : $KCl{O_3} + 6FeS{O_4} + 3{H_2}S{O_4} \to $ $KCl + 3F{e_2}{\left( {S{O_4}} \right)_3} + 3{H_2}O$
Which is True $(T)$ and False $(F)$ in the following sentence ?
The reaction is elementary.
For the reaction
$2 \mathrm{H}_{2}(\mathrm{g})+2 \mathrm{NO}(\mathrm{g}) \rightarrow \mathrm{N}_{2}(\mathrm{g})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{g})$
the observed rate expression is, rate $=\mathrm{k}_{\mathrm{f}}[\mathrm{NO}]^{2}\left[\mathrm{H}_{2}\right] .$ The rate expression of the reverse reaction is
For the reaction
$2 \mathrm{H}_{2}(\mathrm{g})+2 \mathrm{NO}(\mathrm{g}) \rightarrow \mathrm{N}_{2}(\mathrm{g})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{g})$
the observed rate expression is, rate $=\mathrm{k}_{\mathrm{f}}[\mathrm{NO}]^{2}\left[\mathrm{H}_{2}\right] .$ The rate expression of the reverse reaction is
- [JEE MAIN 2020]
For the reaction $A \to B$, the rate increases by a factor of $2.25 $ when the concentration of $A$ is increased by $ 1.5$. What is the order of the reaction
For the reaction $A \to B$, the rate increases by a factor of $2.25 $ when the concentration of $A$ is increased by $ 1.5$. What is the order of the reaction
If $R = K{[NO]^2}[{O_2}],$ rate constant may be increased by
If $R = K{[NO]^2}[{O_2}],$ rate constant may be increased by
What is rate law ? Give a relation between rate of reaction and concentration of reactants.
What is rate law ? Give a relation between rate of reaction and concentration of reactants.