List of top Physical Chemistry Questions on Chemical Kinetics asked in IIT JAM CY

At 30$^\circ$C, the half-life for the decomposition of a compound is 100 seconds and the value of the half-life is independent of the initial concentration of the reactantThe time required for 30\% of the reactant to be consumed is _ _ _ seconds. (rounded off to one decimal place)

For the reaction NO$_2$Cl $\rightarrow$ NO$_2$ + $\frac{1}{2}$Cl$_2$, the proposed mechanism involves the following two elementary steps:
NO$_2$Cl $\xrightarrow{k_1}$ NO$_2$ + Cl
NO$_2$Cl + Cl $\xrightarrow{k_2}$ NO$_2$ + Cl$_2$
Assuming steady state approximation for Cl, the correct expression for the rate of formation of NO$_2$ is

For a zero-order reaction P→Q, the concentration of P becomes half of its initial concentration in 30 minutes after starting the reaction.
The concentration of P becomes zero at ____ minutes. (rounded off to the nearest integer)

The function exp(−2(𝑥-1)²) attains a maximum at 𝑥= _______. (rounded off to the nearest integer)

In the oxidation of phosphorus with oxygen, 0.2 mol of P₄ produces ____ g of P₄O₁₀.
(rounded off to one decimal place)
[Given: Atomic weight of P = 31; Atomic weight of O = 16]

For the reaction

if the concentration of KCN is increased four times, then the rate of the reaction would be

For the elementary reaction

At time 𝑡 = 0, [𝐀] = 𝐴₀ and [𝐁]=[𝐂]=0. At a later time 𝑡, the value of $\frac{[B]}{[C]}$ is ______. (round off to the nearest integer)

An elementary reaction 2A→P follows a second order rate law with rate constant 2.5×10⁻³ dm³ mol⁻¹ s⁻¹ . The time required for the concentration of A to change from 0.4 mol dm⁻3 to 0.2 mol dm⁻³ is ___s.
(round off to the nearest integer)

For the given elementary reactions, the steady-state concentration of X is

The amount of ethane produced in the following reaction is kg.

C2H4 (2 kg) + H2 (2 kg) Wilkinson ′s Catalyst C2H6 (90% catalytic conversion)

(round off to two decimal places)

For the reaction
$H_2PO_2^- (aq) + OH^- (aq) → HPO_3^{2-} (aq) + H_2(g)$
the rate expression is $k[H_2PO_2 ][OH ]^2$. If the concentration of $H_2PO_2^-$ is

A bacterial colony grows via cell division where each mother bacterium independently produces two daughter cells in 20 minutes. If the concentration of bacteria is $ 10^4 \, \text{cm}^{-3} $, the colony becomes harmful. Starting from a colony with an initial concentration of 5 cm$^{-3}$, the time taken (in minutes) for the colony to become harmful is ......... (Round off to nearest integer)

For the reaction shown in Scheme 1, the concentration profiles of different species are provided.
$\text{Scheme 1:}$

Based on this graph, the correct condition(s) regarding the rate constants is(are)

For the radical chain reaction below, the correct classification for step 2 and step 3 is, respectively,
Step 1: $ \text{Br}_2 + M \longrightarrow 2 \text{Br}^+ + M $
Step 2: $ \text{Br}^+ + \text{H}_2 \longleftrightarrow \text{HBr} + \text{H}^+ $
Step 3: $ \text{H}^+ + \text{Br}_2 \longrightarrow \text{HBr} + \text{Br}^+ $

The reaction, $ A \rightarrow $ Products, follows first-order kinetics. If $[A]$ represents the concentration of reactant at time $ t $, the INCORRECT variation is shown in

The time for 50% completion of a zero-order reaction is 30 min. Time for 80% completion of this reaction is ......... min.

$ ^{24}\text{Na} $ decays to one-fourth of its initial amount in 29.8 hours. Its decay constant is ........... hour$^{-1}$ (rounded up to four decimal places).