MCQ-36
Choose the one which is not the assumption of collision theory of reaction rate:
A. For a chemical reaction to occur molecules (particles) must colloid
B. For reacting Particles must possess a certain minimum amount of energy called Ea
C. Every collision is not productive
D. For hydrogen molecule formation from atoms require a specific orientation
Answer: D
MCQ-37
Which one of the following factors does not affect the equilibrium position?
A. Catalyst
B. Concentration of reactants and products
C. Temperature
D. Pressure
Answer: A
MCQ-38
For the first-order reaction, the half-life is related to the expression k t1/2 = 0.693. Half-life is the 1
A. Time taken for the conc. of the product to increase to half of its original value.
B. Time taken for the concentration of the reactant to fall to half of its products value.
C. Time taken for the concentration of the reactant to fall to half of its original value.
D. Time taken for the concentration of reactant to fall to a quarter of its original value.
Answer: C
MCQ-39
The pKa value of CH3COOH is 4.74. The pH of an equimolar solution of acetic acid and sodium acetate is:
A. 13.0
B. 7.2
C. 4.79
D. 4.74
Answer: D
MCQ-40
If the energy of the activated complex is close to the energy of reactants, it means that the reaction is
A. Fast
B. Moderate
C. Slow
D. Very slow
Answer: A
