NEET UG CHEMISTRY MCQ: CHEMICAL KINETICS

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Analyzing +4 | -1

Consider the reaction

2A + B \to product

When concentration of B alone was doubled, the half-life did not change. When the concentration of A alone was doubled, the rate increased by two times. The unit of rate constant for this reaction is

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Correct option: A

L.\mathrm{ }\;mo{l^{ - 1}}\;{s^{ - 1}}

Option A (

L.\mathrm{ }\;mo{l^{ - 1}}\;{s^{ - 1}}

) is correct because the rate law is rate = k[A][B]⁰ = k[A], making the overall order 1, and rate = k[A]², making the overall order 2. Therefore, the rate law is rate = k[A]²[B]⁰, overall order 2. The unit of k is L mol^-1 s^-1.

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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