For a single step reaction $A_{2} + B_{2} ⟶ 2 A B$ , the rate equation is:

r = k {[A B]}^{2}

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r = k {[A_{2}]}^{2} {[B_{2}]}^{2}

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r = k [A_{2}] [B_{2}]

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r = k \frac{[A_{2}] [B_{2}]}{{[A B]}^{2}}

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Solution

The correct option is A $r = k {[A B]}^{2}$

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