For a certain reaction, the rate = , when the initial concentration of A is tripled keeping concentration of B constant, the initial rate would [2023]

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Q.
For a certain reaction, the rate = $k {[A]}^{2} [B]$ , when the initial concentration of A is tripled keeping concentration of B constant, the initial rate would [2023]

1 increase by a factor of nine

2 increase by a factor of three

3 decrease by a factor of nine

4 increase by a factor of six.

Ans.
(1)

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

Keeping conc. of B constant and tripling conc. of A, new rate would be

$r_{2} = k {[3 A]}^{^{2}} [B] = 9 k {[A]}^{^{2}} [B]$

$∴ r_{2} = 9 \times r_{1}$

Solution

Q.
For a certain reaction, the rate = $k {[A]}^{2} [B]$ , when the initial concentration of A is tripled keeping concentration of B constant, the initial rate would [2023]

1 increase by a factor of nine

2 increase by a factor of three

3 decrease by a factor of nine

4 increase by a factor of six.

Ans.
(1)

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

Keeping conc. of B constant and tripling conc. of A, new rate would be

$r_{2} = k {[3 A]}^{^{2}} [B] = 9 k {[A]}^{^{2}} [B]$

$∴ r_{2} = 9 \times r_{1}$

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Solution

Q. For a certain reaction, the rate = k[A]2[B], when the initial concentration of A is tripled keeping concentration of B constant, the initial rate would [2023]

1 increase by a factor of nine

2 increase by a factor of three

3 decrease by a factor of nine

4 increase by a factor of six.

Ans. (1) r1=k[A]2[B] Keeping conc. of B constant and tripling conc. of A, new rate would be r2=k[3A]2[B]=9k[A]2[B] ∴ r2=9×r1

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Q.
For a certain reaction, the rate = $k {[A]}^{2} [B]$ , when the initial concentration of A is tripled keeping concentration of B constant, the initial rate would [2023]

Ans.
(1)

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

Keeping conc. of B constant and tripling conc. of A, new rate would be

$r_{2} = k {[3 A]}^{^{2}} [B] = 9 k {[A]}^{^{2}} [B]$

$∴ r_{2} = 9 \times r_{1}$