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Standard VII

Chemistry

Half Life

Under the sam...

Question

Under the same reaction conditions, the initial concentration of 1.386 mol $d m^{- 3}$ of a substance becomes half in 40 seconds and 20 seconds through first order and zero order kinetics, respectively.

The ratio $(k_{1} / k_{0}$ ) of the rate constants for first order $(k_{1})$ and zero order $(k_{0})$ of the reaction is

0.5

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1.0

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1.5

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Solution

The correct option is A $0.5$
For the first order reaction,the rate constant

$k_{1} = \frac{0.693}{t_{1 / 2}} = \frac{0.693}{40}$

For zero order reaction, the rate constant

$k_{0} = \frac{A_{0}}{2 \times t_{1 / 2}} = \frac{1.386}{2 \times 20}$

Hence,
$\frac{k_{1}}{k_{0}} = \frac{0.693}{1.386} = 0.5$

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Similar questions

Q. Under the same reaction condition, initial concentration of

1.386 {mol dm}^{- 3}

of a substance becomes half in

40

seconds and

20

seconds through first order and zero order kinetics respectively. Ratio

(k_{1} / k_{o})

of the rate constant for first order

(k_{1})

and zero order

(k_{0})

of the reaction is:

Q. Under the same reaction conditions, initial concentration of

1.386

m o l

{d m}^{- 3}

of a substance becomes half in

40

seconds and

20

seconds through first order and zero order kinetics respectivley. Ratio

(\frac{k_{1}}{k_{0}})

of the rate constant for first order

(k_{1})

and zero order

(k_{0})

of the reaction is:

Under the same reaction conditions, the initial concentration of 1.386 mol $d m^{- 3}$ of a substance becomes half in 40 s and 20 s through first order and zero order kinetics, respectively.

The ratio $(k_{1} / k_{0}$ of the rate constants for first order $(k_{1})$ and zero order $(k_{0})$ of the reaction is

Under the same reaction conditions, initial concentration of 1.386 $m o l d m^{- 3}$ of a substance becomes half in 40 s amd 20 s through first order and zero order kinetics respectively. Ratio $(\frac{k_{1}}{k_{0}})$ of the rate constants for first order $(k_{1})$ and zero order $(k_{0})$ of the reaction is:

Under the same reaction conditions, the initial concentration of 1.386 mol $d m^{- 3}$ of a substance becomes half in 40 seconds and 20 seconds through first order and zero order kinetics, respectively.

The ratio $(k_{1} / k_{0}$ ) of the rate constants for first order $(k_{1})$ and zero order $(k_{0})$ of the reaction is

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Under the same reaction conditions, the initial concentration of 1.386 mol dm−3 of a substance becomes half in 40 seconds and 20 seconds through first order and zero order kinetics, respectively. The ratio (k1/k0) of the rate constants for first order (k1) and zero order (k0)of the reaction is

The correct option is A 0.5For the first order reaction,the rate constant k1=0.693t1/2=0.69340 For zero order reaction, the rate constant k0=A02×t1/2=1.3862×20 Hence, k1k0=0.6931.386=0.5