Q. The half-life of a first-order reaction is independent of the initial concentration of the reactant. What is the expression for the half-life? (2022)
A.t₁/₂ = 0.693/k
B.t₁/₂ = k/0.693
C.t₁/₂ = 1/k
D.t₁/₂ = k/1
Solution
The half-life of a first-order reaction is given by t₁/₂ = 0.693/k.
Q. The half-life of a first-order reaction is independent of the initial concentration of the reactant. What is the expression for the half-life (t₁/₂)? (2022)
A.t₁/₂ = 0.693/k
B.t₁/₂ = k/0.693
C.t₁/₂ = 1/k
D.t₁/₂ = k/1
Solution
The half-life of a first-order reaction is given by t₁/₂ = 0.693/k.
Q. The half-life of a first-order reaction is independent of the initial concentration of the reactant. What is the expression for the half-life (t1/2)? (2022)
A.t1/2 = 0.693/k
B.t1/2 = k/0.693
C.t1/2 = 1/k
D.t1/2 = k/2
Solution
The half-life of a first-order reaction is given by the expression t1/2 = 0.693/k, where k is the rate constant.
Q. The rate of a reaction is defined as the change in concentration of a reactant or product per unit time. What is the general form of the rate equation? (2023)
A.Rate = k[A]^n
B.Rate = k[A][B]
C.Rate = k[A]^2[B]
D.Rate = k[A] + [B]
Solution
The general form of the rate equation is Rate = k[A]^n, where n is the order of the reaction.
Q. The rate of a reaction is directly proportional to the concentration of one reactant raised to the power of 2. What is the order of the reaction? (2022)
A.Zero order
B.First order
C.Second order
D.Third order
Solution
If the rate is proportional to the concentration of one reactant raised to the power of 2, the reaction is second order.
Q. The rate of a reaction is directly proportional to the product of the concentrations of the reactants raised to their respective powers. This statement defines:
A.Rate law
B.Equilibrium constant
C.Reaction quotient
D.Catalytic efficiency
Solution
This statement defines the rate law of a reaction.
Q. The rate of a reaction is directly proportional to the product of the concentrations of the reactants raised to their respective powers. This statement defines which law?
A.Law of conservation of mass
B.Rate law
C.Le Chatelier's principle
D.Gibbs free energy
Solution
This statement defines the rate law of a chemical reaction.
