Rate of a Chemical Reaction and Factors Affecting the Rate of Reactions (Concentration, Temperature,... ) NEET Questions

Physical Chemistry - Chemical Kinetics

Rate of a Chemical Reaction and Factors Affecting the Rate of Reactions (Concentration, Temperature,... ) MCQ Questions


7.
In the reaction A → B, the concentration of A decreases from 0.5 M to 0.4 M in 10 minutes. The average rate of reaction is:
A.
5.0 × 10⁻³ mol L⁻¹ min⁻¹
B.
1.0 × 10⁻¹ mol L⁻¹ min⁻¹
C.
1.0 × 10⁻² mol L⁻¹ min⁻¹
D.
2.0 × 10⁻² mol L⁻¹ min⁻¹
😑 View Answer Rough Work Error
ANSWER :
C. 1.0 × 10⁻² mol L⁻¹ min⁻¹
8.
For a gaseous reaction, the rate is expressed as:
A.
dp/dV only
B.
dn/dt only
C.
Volume change per unit time
D.
-(1/V)(dn/dt) or -(dp/dt) in terms of partial pressure
😑 View Answer Rough Work Error
ANSWER :
D. -(1/V)(dn/dt) or -(dp/dt) in terms of partial pressure
9.
The rate of a reaction generally:
A.
Decreases with the progress of the reaction
B.
Remains constant throughout the reaction
C.
First increases then decreases
D.
Increases with the progress of the reaction
😑 View Answer Rough Work Error
ANSWER :
A. Decreases with the progress of the reaction
10.
The rate of disappearance of MnO₄⁻ in the reaction 2MnO₄⁻ + 10I⁻ + 16H⁺ → 2Mn²⁺ + 5I₂ + 8H₂O is 4.56 × 10⁻³ mol L⁻¹ s⁻¹. The rate of appearance of I₂ is:
A.
9.12 × 10⁻³ mol L⁻¹ s⁻¹
B.
2.28 × 10⁻³ mol L⁻¹ s⁻¹
C.
4.56 × 10⁻³ mol L⁻¹ s⁻¹
D.
1.14 × 10⁻² mol L⁻¹ s⁻¹
😑 View Answer Rough Work Error
ANSWER :
D. 1.14 × 10⁻² mol L⁻¹ s⁻¹
11.
Rate law is an expression which:
A.
Is derived only from the balanced equation
B.
Relates the rate to stoichiometric coefficients only
C.
Relates the rate of a reaction with the concentrations of reactants raised to experimentally determined powers
D.
Gives the rate in terms of products formed
😑 View Answer Rough Work Error
ANSWER :
C. Relates the rate of a reaction with the concentrations of reactants raised to experimentally determined powers
12.
The rate constant of a reaction depends on:
A.
Concentrations of reactants
B.
Pressure of reactants
C.
Volume of the container
D.
Temperature and presence of a catalyst
😑 View Answer Rough Work Error
ANSWER :
D. Temperature and presence of a catalyst