NEET UG CHEMISTRY MCQ: CHEMICAL KINETICS

1 Medium

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Analyzing +4 | -1

For an elementary reaction

2 {A} \rightarrow {B},

consider following statements:

(a) Rate law can be written as rate

={k}[{A}]^2

(b) On increasing temperature, rate constant

k

decreases.

(c) On doubling the volume, rate becomes one fourth.

(d) On doubling the concentration, rate becomes one fourth.

Choose the correct answer from the options given below:

View answer and explanation

Correct option: A

(a), (c) only

Option A ((a), (c) only) is correct because for an elementary reaction 2A -> B, the rate law is indeed rate = k[A]², and doubling the volume quarters the rate.

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If the reaction rate at a given temperature becomes slower then

\frac{1}{{{{\left[ A \right]}^2}}}

vs times are a straight line. Order of reaction is The rate constant

\left( {k'} \right)

of one of the reaction is found to be double that of the rate constant

\left( {k''} \right)

of another reaction. Then the relationship between the corresponding activation energies of the two reaction

\left( {{{E'}_a}\;\mathrm{and}\;{{E''}_a}} \right)

can be represented as Acid hydrolysis of sucrose is a Order of radioactive disintegration reaction is Temperature coefficient of a reaction is 2. When temperature is increased from

30^\circ C\;to\;100^\circ C

, rate of the reaction increases by