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Q.The sum of the powers of the concentration terms that occur in the rate equation is called :

(a) rate
(b) molecularity
(c) rate constant
(d) order
Tamil Nadu DgeTamil Nadu HSC (DGE) Board 2018MCQ· 1mImportance★★★★★
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The order of a reaction is the sum of the exponents of the concentration terms in the experimentally determined rate law.

For a reaction with rate law Rate=k[A]x[B]yRate = k[A]^x[B]^y, the overall order =x+y= x + y. This is distinct from molecularity, which is the number of reacting species (atoms/ions/molecules) that collide simultaneously in an elementary step — order is an experimentally det …

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