For a first order reaction A → B, the reaction rate at reactant concentration of 0.01 M is found to be 2.0 × 10-5 mol L-1s-1. The half-life period of the reaction is
220 s
30 s
300 s
347 s
The correct statement is
The rate constant of an exothermic reaction decreases with increase in temperature
The rate constant of an endothermic reaction increases with increase in temperature
The rate constant of forward and backward directions of a reversible reaction decreases with increase in temperature
The rate constant of forward direction increases while that of backward reaction decreases with increase in temperature.
In the case of a first order reaction, when log k (y-axis) is plotted against 1/T, a straight line graph with slope -1.25×104 is obtained. The energy of activation for the reaction is
28.78 kJ mol-1
2.77 kJ mol-1
239.34 kJ mol-1
27.7 kJ mol-1
For a reaction 2A + B → C + D, the active mass of B is kept constant but that of A is tripled. The rate of the reaction will be
Decrease by 3 times
Increase by 9 times
Increase by 3 times
Unpredictable
For the reaction CO + Cl2 → COCl2, the rate is given by, r = k [COCl2]3/2. The unit of the reaction rate is
L-1
s-1
mol3/2 L-3/2 s-1
L-1 mol s-1
If the plot of log [A] against time t is a straight line with a negative slope, the reaction is in the order of
Zero
First
Second
Third
The use of a catalyst does not help in
Increasing the rate of forward reaction
Increasing the rate of backward reaction
Increasing the relative amounts of products
Changing the activation energy of the reaction
In the following reaction, how is the rate of appearance of the underlined product related to the rate of disappearance of the underlined reactant?
The rate constant of a reaction is given by the equation k = P.Ze–Ea/RT. The factor that should register a decrease for the reaction to proceed more rapidly is
T
Z
Ea
P
For the reaction A → B, in the presence of catalyst, the true statement is
Activation energy is lower, rate is faster, ΔH is different
Activation energy is lower, rate is slower, ΔH is same
Activation energy is lower, rate is faster, ΔH is same
Activation energy is higher, rate is faster, ΔH is same
