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Chemistry I

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

Identify the order of a reaction, if the rate constant has the units: litre / moles/sec.

Second order, since units of rate constant are
conc^–1 time^–1.

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Decomposition of hydrogen peroxide (Both order and molecularity is one).

H_{2} O_{2} (solution) \to H_{2} O + \frac{1}{2} O_{2} .

814 Views

A rate constant of a reaction is 3 x 10^–4 L mol^–1 min^–1. What is the order of the reaction?

The unit of second order rate constant is L mol–1 s–1, therefore 3 x 10^–4 L mol^–1 min^–1represents a second order reaction.

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The plot of log k versus X is linear with a slope

= \frac{- E_{a}}{2.303 R} .

What is X?

\log k = \log A - \frac{- E_{a}}{2.303 R} . X is \frac{1}{T} .

136 Views

Give an example of a pseudo first order reaction.

A pseudo first order reaction is a reaction that is truly second order but can be approximated to be first order under special circumstances.

{CH}_{3} {COOC}_{2} H_{5} + H_{2} O \to {CH}_{3} COOH + C_{2} H_{5} OH .

Rate = k {[{CH}_{3} {COOC}_{2} H_{5}]}^{1} {[H_{2} O]}^{0} .

1255 Views