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Q.

For an elementary reaction, $2 A + B \to C + D$ , the active mass of B is kept constant but that of A is tripled. The rate of reaction will

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a

increase by 9 times

b

increase by 3 times

c

decrease by 6 times

d

decrease by 3 times

answer is B.

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Detailed Solution

According to the given reaction, Rate $= k [A]^{2} [B]^{1}$
When A becomes $3 A$ i.e. triples, the rate will become:
Rate $= k [3 A]^{2} [B]^{1} =$ $9 k [A]^{2} [B]$
Thus, rate of reaction is increased by 9 times.

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