Chemical Kinetics

Chemical Kinetics
Class:XII / Unit:4

The time required for 100% completion of a zero order reaction is

a
a/k
2k
k/a

The rate of a chemical reaction doubles for every 10°C rise of temperature. If the temperature is raised by 50°C, the rate of the reaction increases by about

8 times
16 times
64 times
32 times

Which of these changes with time for a first-order reaction? A. Rate of reaction, B. Rate constant, C. Half-life

A only
B & C only
B only
A & B only

Which of these changes with time for a first-order reaction? A. Rate of reaction, B. Rate constant, C. Half-life

∆H
∆S
∆G
Ea

If the initial concentration of reactant is doubled, t1/2 is also doubled, the order of reaction is

Two
one
Zero
Three

Activation energy of a chemical reaction can be determined by

determining the rate constant at standard temperature
using catalyst
determining the rate constants at two temperatures
determining probability of collision

Which of the following statements about the catalyst is true ?

A catalyst makes equilibrium constant more favourable for forward reaction
A catalyst accelerates the rate of reaction by bringing down the activation energy
A catalyst does not participate in reaction mechanism
A catalyst makes the reaction feasible by making ∆G more negative

Order of reaction of the reaction H2 + Cl2---> 2HCl is

three
zero
one
two

In the presence of a catalyst, the heat evolved or absorbed during the reaction

remains unchanged
Increases
decreases
may increase or decrease

A reaction whose temperature is increased from 10*C to 50*C then increase in rate of reaction will be

32 times
5 times
8 times
16 times

A catalyst increases the rate of reaction by

Increasing the activity of reactants
Decreasing the activation energy
First decreases then Increases
All the above