Chemical Kinetics Test

Result

Chemical Kinetics Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

In a first-order reaction A→ B, if K is the rate constant and initial concentration of the reactant A is 0.5 M, then half-life is ___________?

A
0.693/k

B
1.26/k

C
0.96/k

D
1.38/k

Solution

As, we all know that half-life for the first order reaction is,

= 0.693/k

Where,

K= rate constant of the reaction.

and, independent of the concentration of the reactant.

Here in this question;

Given,

Rate constant = K

Concentration of the reactant = 0.5 M

So,

Half-life = 0.693/k

And no use of 0.5 M for the calculation in half-life of first-order reaction.
Question 2
1 / -0

Rate of gaseous reaction is given by the expression, Rate = K[A][B]

If the volume of reaction vessel is suddenly reduced to one fourth of the initial volume. The new reaction rate relating to original rate will be _________________times?

A
10

B
8

C
16

D
32

Solution

After decreasing the volume to one-fourth of the solution,

New conc. of A = 4[A]

New conc. of B = 4[B]

New reaction rate = k× 4[A]× 4[B]

=16k[A][B]

So, New reaction rate is 16 times the original reaction rate.
Question 3
1 / -0

If the rate of the reaction is equal to the rate constant, the order of the reaction is

A
1

B
2

C
3

D
0

Solution

Expression for the rate of reaction for zero order reaction is,

Rate = K.

Or, Rate = Rate Constant.