JEE Main · Chemistry

Chemical kinetics

25 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

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For a chemical reaction $2A + B \to C + 3D$ , the rate of disappearance of $A$ is $0.06 mol \cdot L^{- 1} \cdot s^{- 1}$ . What is the rate of formation of…
What are the SI units of the rate constant $k$ for a second-order reaction?
A first-order reaction has a rate constant of $k = 3.465 \times 1 0^{- 3} s^{- 1}$ . What is the half-life ( $t_{1/2}$ ) of the reaction?
If a first-order reaction is $50%$ complete in $20 minutes$ , how long will it take to reach $75%$ completion under the same conditions?
For a reaction $A + B \to Products$ , doubling the concentration of $A$ while keeping $[B]$ constant quadruples the reaction rate. Doubling $[B]$ while keepi…
For a zero-order reaction $A \to Products$ with rate constant $k = 0.02 mol \cdot L^{- 1} \cdot s^{- 1}$ , how much time is required for the concentration of…
The rate constant of a reaction at $300 K$ is $k_{1} = 1.0 \times 1 0^{- 4} s^{- 1}$ and at $310 K$ is $k_{2} = 2.0 \times 1 0^{- 4} s^{- 1}$ . What is the activation energy $E_{a}$ …
In the presence of a catalyst, the activation energy of a reaction is lowered from $80 kJ/mol$ to $55 kJ/mol$ at $300 K$ . By what factor does the rate of the reaction increase?…
For a radioactive isotope obeying first-order kinetics, what fraction of the original sample remains undecayed after 4 half-lives?
A plot of $ln k$ versus $1/ T$ for a certain reaction gives a straight line with a slope of $- 6000 K$ . What is the activation energy $E_{a}$ of the reaction? (…
The acid-catalyzed hydrolysis of ethyl acetate is an example of which type of reaction kinetics?
For a reaction $A \to B$ , the half-life $t_{1/2}$ is found to be inversely proportional to the initial concentration of reactant $A$ ( $t_{1/2} \propto 1/ [A]_{0}$ ). Wha…
What is the ratio $t_{99.9%} / t_{50%}$ for a first-order chemical reaction?
For a reaction with activation energy $E_{a} = 0 kJ/mol$ , what is the effect of increasing temperature on the rate constant $k$ ?
The decomposition of substance $X$ follows second-order kinetics with $k = 0.50 L \cdot mol^{- 1} \cdot min^{- 1}$ . If the initial concentration is $0.20 mol/L$ , what…
Which of the following statements about the molecularity of an elementary reaction is FALSE?
A complex chemical reaction takes place in three sequential steps:
Step 1: $A + B ⇌ AB$ (fast, equilibrium constant $K_{1}$ )
Step 2: $AB + C \to ABC$ (slow, ra…
In collision theory, the rate of a bimolecular reaction is given by $Rate = P Z_{A B} e^{- E_{a} / R T}$ . What does the factor $P$ represent?
The rate constant of a reaction is $k = 2.5 \times 1 0^{- 2} min^{- 1}$ . What percentage of the initial reactant remains after $120 minutes$ ? (Given: $e^{- 3.0} = 0.0498$ )
For a reaction $A \to B$ , the temperature coefficient is $2.0$ . If the reaction rate is $r_{1}$ at $2 5^{\circ} C$ , what is the rate of the reaction at $7 5^{\circ} C$ ?
For a certain first-order reaction, the time required to complete $90%$ of the reaction ( $t_{90%}$ ) is related to the half-life ( $t_{1/2}$ ) by which factor? ( $lo g_{10} 2 = 0.301$ )
In an experiment for $A + B \to C$ , the following data were obtained:
Experiment 1…
Which of the following conditions is necessary for a collision between two reacting molecules to result in a chemical reaction according to collision theory?
For a reaction with rate law $Rate = k [A]^{1/2} [B]^{2}$ , what is the overall order of the reaction?
A catalyst increases the rate of a chemical reaction by which of the following mechanisms?

Chemical kinetics

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