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NEET Questions / Chemistry / Chemical Kinetics / Rate Of Reaction
For a reaction A + B → C, the rate law is found to be Rate = k[A]²[B]⁻¹. If the concentration of A is tripled while keeping the concentration of B constant, the factor by which the reaction rate changes is:
3
1/3
1/9
9
For a zero-order reaction, the plot of concentration of reactant versus time is:
a straight line with a positive slope
a straight line with a negative slope
an exponential decay curve
a hyperbolic curve
The half-life of a first-order reaction is 20 minutes. What fraction of the reactant remains after 80 minutes?
1/2
1/4
1/8
1/16
For a reaction with the rate law: Rate = k[A]^[1/2][B], if the concentration of B is doubled while keeping [A] constant, how does the half-life change?
The half-life doubles.
The half-life is halved.
The half-life remains unchanged.
The half-life is quadrupled.
Which of the following factors does NOT affect the rate of a chemical reaction?
Concentration of reactants
Temperature
Presence of a catalyst
The volume of the container (for reactions not involving gases)
Which of these indicates a faster reaction rate?
A small negative change in reactant concentration over a long time
A large negative change in reactant concentration over a short time
No change in reactant concentration over time
A small positive change in reactant concentration over a long time
Increasing the surface area of a solid reactant generally...
Decreases the reaction rate
Increases the reaction rate
Has no effect on the reaction rate
Changes the order of the reaction
