NEET 2023 — Chemistry solution

NEET2023Chemistry

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:

A
increase by a factor of six
B
increase by a factor of nine
C
increase by a factor of three
D
decrease by a factor of nine

Solution

The rate depends on $[A]^{2}$ . Tripling $[A]$ scales the rate by $3^{2} = 9$ at fixed $[B]$ .

$r_{n e w} = k (3 [A])^{2} [B] = 9 k [A]^{2} [B] = 9 r$ .

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