Question:
In a first order reaction with time the concentration of the reactant decreases
In a first order reaction with time the concentration of the reactant decreases
Show Hint
Radioactive decay is a classic example of first order kinetics.
Updated On: Mar 20, 2026
- linearly
- exponentially
- no change
- None of these
Hide Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
For first order reactions,
[A] = [A]₀ e⁻kt
Thus concentration decreases exponentially with time.
Was this answer helpful?
0
0
Top BITSAT Chemistry Questions
- How many grams of $ \mathrm{Al_2(SO_4)_3} $ are required to produce 10 L of a 0.5 M solution? (Molar mass = 342 g/mol)
- BITSAT - 2025
- Chemistry
- Mole concept and Molar Masses
- Which of the following molecules has a linear shape?
- BITSAT - 2025
- Chemistry
- Chemical bonding and molecular structure
- The number of moles of CO$_2$ produced when 2 moles of C$_2$H$_6$ are completely burnt is:
- BITSAT - 2025
- Chemistry
- Stoichiometry and Stoichiometric Calculations
- What is the pH of a 0.01 M solution of HCl?
- BITSAT - 2025
- Chemistry
- Chemistry in Everyday Life
- The pH of a solution is 3. What is the concentration of hydrogen ions in this solution?
- BITSAT - 2025
- Chemistry
- Solutions
View More Questions
Top BITSAT Collision Theory of Chemical Reactions Questions
- Among the ligands \( {NH}_3, \, {en}, \, {CN}^-, \, {CO} \), the correct order of their increasing field strength is:
- BITSAT - 2023
- Chemistry
- Collision Theory of Chemical Reactions
- The rate of reaction between two reactants A and B decreases by a factor of 4 if the concentration of reactant B is doubled. The order of reaction with respect to reactant B is:
- BITSAT - 2021
- Chemistry
- Collision Theory of Chemical Reactions
- For the reaction H₂(g) + Br₂(g) → 2HBr(g), the experimental data suggest, rate = k[H₂][Br₂]¹/2. The molecularity and order of the reaction are respectively
- BITSAT - 2021
- Chemistry
- Collision Theory of Chemical Reactions
In the reaction: P + Q longrightarrow ?R + S The time taken for 75% reaction of P is twice the time taken for 50% reaction of P. The concentration of Q varies with time as shown in the figure. The overall order of the reaction is:
- BITSAT - 2020
- Chemistry
- Collision Theory of Chemical Reactions
- Consider the reaction: Cl₂(aq) + H₂S(aq) → S(s) + 2H⁺(aq) + 2Cl⁻(aq) The rate equation for this reaction is: rate = k[Cl₂][H₂S] Which of these mechanisms is/are consistent with the rate equation? A. Cl₂ + H₂S → H⁺ + Cl⁻ + Cl⁺ + HS⁻ (slow) Cl⁺ + HS⁻ → H⁺ + Cl⁻ + S (fast) B. H₂S rightleftharpoons H⁺ + HS⁻ (fast equilibrium) Cl₂ + HS⁻ → 2Cl⁻ + H⁺ + S (slow)
- BITSAT - 2020
- Chemistry
- Collision Theory of Chemical Reactions
View More Questions
Top BITSAT Questions
- What is the dot product of the vectors \( \mathbf{a} = (2, 3, 1) \) and \( \mathbf{b} = (1, -1, 4) \)?
- BITSAT - 2025
- Vector Algebra
- Rearrange the following parts to form a meaningful sentence:
P. technological advancement
Q. has led to
R. in many fields
S. a significant leap- BITSAT - 2025
- Sentence Arrangement
- A dust particle of mass 4 × 10⁻¹² mg is suspended in air under the influence of an electric field of 50 N/C directed vertically upwards. How many electrons were removed from the neutral dust particle? (g = 10 m/s²)
- BITSAT - 2025
- Electrostatics
- In a mixture of gases, the average number of degrees of freedom per molecule is 6. If the rms speed of the molecule is \(c\), what is the velocity of sound in the gas?
- BITSAT - 2025
- kinetic theory
- A ball is thrown vertically upward with a speed of 49 m/s. How long will it take to return to the thrower’s hand?
- BITSAT - 2025
- Kinematics
View More Questions