Consider the following reactions $\mathrm{A} \rightarrow \mathrm{P} 1 ; \mathrm{B} \rightarrow \mathrm{P} 2 ; \mathrm{C} \rightarrow \mathrm{P} 3 ; \mathrm{D} \rightarrow \mathrm{P} 4$, The order of the above reactions are $\mathrm{a}, \mathrm{b}, \mathrm{c}$ and d , respectively. The following graph is obtained when log[rate] vs. log[conc.] are plotted: Among the following, the correct sequence for the order of the reactions is:

JEE Main · 2020 · 06 Sep 2020 · Shift 1 · Chemical Kinetics

Consider the following reactions

A \to P 1; B \to P 2; C \to P 3; D \to P 4

,
The order of the above reactions are

a, b, c

and d , respectively. The following graph is obtained when log[rate] vs. log[conc.] are plotted:

Among the following, the correct sequence for the order of the reactions is:

(A) $d > a > b > c$
(B)a $>$ b $>$ c $>$ d
(C)c $>$ a $>$ b $>$ d
(D)d $>$ b $>$ a $>$ c✓ Correct

Answer: (D)

Solution

Taking logarithms of

rate = k [conc]^{n}

gives

lo g (rate) = lo g k + n lo g [conc]

, so each line's slope equals the order of that reaction. The steeper the line, the higher the order, and reading the slopes from steepest to shallowest fixes the sequence of orders as

d > b > a > c

JEE Main · 2020 · 06 Sep 2020 · Shift 1 · Single correct option

Practise more: all JEE Main PYQs on Chemical Kinetics →

More JEE Main questions on Chemical Kinetics

Pre-exponential factors of two different reactions of same order are identical. Let activation energy of first reaction exceeds the activation energy of second reaction by $20 kJ mol^{- 1}$ . If $k_{1}$ and $k_{2}$ are the rate constants of fir …
JEE Main 2026View solution →
A → products (First order reaction).

Three sets of experiment were performed for a reaction under similar experimental conditions.
Run $1 \Rightarrow 100 mL$ of 10 M solution of reactant A
Run $2 \Rightarrow 200 mL$ of 10 M solution of reactant A
Run …
JEE Main 2026View solution →
The temperature at which the rate constants of the given below two gaseous reactions become equal is
____ K. (Nearest integer).
$X ⟶ Y k_{1} = 1 0^{6} e^{\frac{- 30000}{T}}$ …
JEE Main 2026View solution →
Decomposition of A is a first order reaction at $T (K)$ and is given by $A (g) \to B (g) + C (g)$ . In a closed 1 L vessel, 1 bar $A (g)$ is allowed to decompose at $T (K)$ . …
JEE Main 2026View solution →
Correct statements regarding Arrhenius equation among the following are :
(A) Factor $e^{- Ea / RT}$ corresponds to fraction of molecules having kinetic energy less than Ea.
(B) At a given temperature, lower the Ea, faster is the reaction.
(C) Increase in tempe …
JEE Main 2026View solution →
Consider $A k_{1} B$ and $C k_{2} D$ are two reactions. If the rate constant $(k_{1})$ of the $A \to B$ reaction can be expressed by the following equation …
JEE Main 2026View solution →