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Factors Affecting the Rate of a Chemical Reaction

The rate cons...

Question

The rate constants for three reactions showing Ist, IInd, IIIrd order respectively are same. Which one is true for the rate of three reactions?

r_{1} = r_{2} = r_{3}

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r_{1} > r_{2} > r_{3}

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r_{1} < r_{2} < r_{3}

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none of these

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Solution

The correct options are
B $r_{1} > r_{2} > r_{3}$
C $r_{1} = r_{2} = r_{3}$
D $r_{1} < r_{2} < r_{3}$
For nth order reaction, the rate of the reaction is given by the expression rate $= k [A]^{n}$ .
The rate of the reaction depends on the rate constant, the reactant concentration and the reaction order.
Although the rate constants are same, nothing is mentioned regarding the reactant concentrations.
The rate of the reaction for three reactions may be same or different.
Hence, any one of the following may be true.
$r_{1} = r_{2} = r_{3}$
$r_{1} > r_{2} > r_{3}$
$r_{1} < r_{2} < r_{3}$

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Similar questions

The rate constant is numerically the same for three reaction of first, second and third order respectively. Which one is true for rate of three reaction, if concentration of reactant is greater than 1M?

(1) r₁= r₂ = r₃

(2) r₁> r₂> r₃

(3) r₁< r₂< r₃

(4) All of these

Q. Assertion :In a

△ A B C

, if

a < b < c

and

r

is inradius and

r_{1}, r_{2}, r_{3}

are the axradii opposite to angle

A, B, C

respectively, then

r < r_{1} < r_{2} < r_{3}

Reason:

△ A B C, r_{1} r_{2} + r_{2} r_{3} + r_{3} r_{1} = \frac{r_{1} r_{2} r_{3}}{r}

\frac{R_{1}}{r_{1}} + \frac{R_{2}}{r_{2}} + \frac{R_{3}}{r_{3}} =

Q. Three circles

C_{1}, C_{2}

and

C_{3}

with radii

r_{1}, r_{2}

and

r_{1} + r_{2}

respectively are such that

C_{1}

and

C_{2}

touch each other externally and

C_{3}

internally. Another circle with radius

r_{3}

touches all the three circles. If

r_{1} > r_{2} > r_{3}

and

r_{1}, r_{2}, r_{3}

are in A.P. then

{(\frac{r_{1}}{r_{2}})}^{3}

Q. For series

L - C - R

, graph between peak current and frequency (

ω

) shown in the figure below.
The correct order for

R_{1}, R_{2} a n d R_{3}

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