MHT CET PYQs for Chemical Kinetics with Solutions: Practice MHT CET Previous Year Questions

1.

The rate constant for a first-order reaction whose half-life is 480 seconds is:

• \( 2.88 \times 10^{-3} \, \text{s}^{-1} \)
  
• \( 2.72 \times 10^{-3} \, \text{s}^{-1} \)
  
• \( 1.44 \times 10^{-3} \, \text{s}^{-1} \)
  
• \( 1.44 \, \text{s}^{-1} \)
  

2.

In 2-chloro-3,4-dimethylhexane, how many chiral carbon atoms are present?

• \(1\)
  
• \(2\)
  
• \(3\)
  
• \(4\)
  

3.

For a chemical reaction rate law is, rate $= k[A]^{2}[B]$ If $[A]$ is doubled at constant $[B]$, the rate of reaction

• increases by a factor of $8$
• increases by a factor of $4$
• increases by a factor of $3$
• increases by a factor of $2$

4.

Which one of the following is vinyl alcohol?

• But-2-en-2-ol
  
• Prop-2-en-1-ol
  
• Ethanol
  
• Methanol

5.

The decomposition of a compound A follows first-order kinetics. The concentration of A at time t = 0 is 1.0 mol L^-1. After 60 minutes, it reduces to 0.25 mol L^-1. What is the initial rate of the reaction at t = 0? (Take ln 2 = 0.693)

• 0.0115 mol L$^{-1}$ min$^{-1}$
  
• 0.0173 mol L$^{-1}$ min$^{-1}$
  
• 0.277 mol L$^{-1}$ min$^{-1}$
  
• 0.0364 mol L$^{-1}$ min$^{-1}$

6.

For a reaction, the rate law is given by \( \text{rate} = k[A]^2[B] \). If the concentration of \( A \) is doubled and the concentration of \( B \) is halved, how will the rate of the reaction change?

• The rate will be doubled.
  
• The rate will be halved.
  
• The rate will be quadrupled.
  
• The rate will remain unchanged.
  

7.

The rate constant for a first-order reaction is \( 0.0693 \, \text{min}^{-1} \). What is the half-life of the reaction?

• \( 5 \, \text{min} \)
  
• \( 10 \, \text{min} \)
  
• \( 15 \, \text{min} \)
  
• \( 20 \, \text{min} \)
  

8.

Which among the following reactions is an example of pseudo first order reaction ?

• Inversion of cane sugar
• Decomposition of $H_2O_2$
• Conversion of cyclopropane to propene
• Decomposition of $N_2 O_5 $

9.

The plot that represents the zero-order reaction is:

10.

The rate constant of a first-order reaction is \( 2 \times 10^{-3} \, \text{s}^{-1} \). What is the half-life of the reaction?

• 0.347 s
  
• 1.4 s
  
• 0.693 s
  
• 2.0 s
  

11.

For the reaction: \[ 2A + B \rightarrow 3C \] The rate law is given as: \[ \text{Rate} = k[A]^2[B] \] If the concentration of A is doubled and the concentration of B is halved, how does the rate of the reaction change?

• It remains the same.
  
•  It increases by a factor of 4. 
  
   

• It doubles.

• It decreases by a factor of 2.
  

12.

Ammonia and oxygen react at high temperature as in reaction, 
4HN₃(g) + 5O₂(g) → 4NO(g) + 6H₂O(g) 
If rate of formation of NO is 3.6 x 10^–3 mol L^–1 .sec^–1 . Calculate the rate of formation of water.

• 6.0 x 10^–3 mol L^–1 sec^–1

• 3.6 x 10^–3 mol L^–1 sec^–1

• 1.8 x 10^–3 mol L^–1 sec^–1

• 5.4 x 10^–3 mol L^–1 sec^–1

13.

For a reaction A $\rightarrow$ B, the rate doubles when temperature increases from 298 K to 308 K. What is the activation energy (Ea)?

• 52 kJ/mol
  
• 48 kJ/mol
  
• 62 kJ/mol
  
• 66 kJ/mol

14.

Find the pH if \( pK_b \), \([ \text{base} ]\), and \([ \text{salt} ]\) are given.

• \(7\)
  
• \(4\)
  
• \(9.55\)
  
• \(5\)
  

15.

For a reaction A \(\rightarrow\) B, the rate law is given by: \[ \text{Rate} = k[\text{A}]^2 \] If the concentration of A is increased by a factor of 3, by what factor does the rate of the reaction increase?

• 3
  
• 9
  
• 27
  
• 6