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Standard X

Chemistry

Factors Affecting the Rate of a Chemical Reaction

How will the ...

Question

How will the rate change if the concentration of A is doubled and that of B is tripled?
Given that, $r = k [A]^{2} [B]$

The rate increases 12 times of original value.

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The rate increases 8 times of original value.

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The rate reduces 12 times of original value.

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The rate reduces 8 times of original value.

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Solution

The correct option is C The rate increases 12 times of original value.
As given,

$r_{1} = k [A]^{2} [B]$
$r_{2} = k [2 A]^{2} [3 B]$

$\frac{r_{2}}{r_{1}} = 12 \Rightarrow r_{2} = 12 r_{1}$

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How will the rate change if the concentration of A is doubled and that of B is tripled? Given that, r=k[A]2[B]

The correct option is C The rate increases 12 times of original value.As given,r1=k[A]2[B]r2=k[2A]2[3B]r2r1=12⇒r2=12r1

How will the rate change if the concentration of A is doubled and that of B is tripled?
Given that, $r = k [A]^{2} [B]$

The correct option is C The rate increases 12 times of original value.
As given,

$r_{1} = k [A]^{2} [B]$
$r_{2} = k [2 A]^{2} [3 B]$

$\frac{r_{2}}{r_{1}} = 12 \Rightarrow r_{2} = 12 r_{1}$