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अभिक्रिया `A+Brarr` उत्पाद का वेग व्यंजक इस प्रकार है दर = `K[A]^n[B]^m, A` की सान्द्रतादोगुनी करने पर तथा B की सान्द्रताआधी करने पर नई अभिक्रिया का दर का पुराणी अभिक्रिया दर से अनुपात होगा
A. n-m
B. `2^(n-m)`
C. `1/(2^(m+n))`
D. m+n

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`r_0=K[A]^n[B]^m`
`r_1=K[2A]^n[B//2]^m`
`r_1=K2^(n-m)[A]^n[B]^m" या "r_1=rxx2^(n-m)`

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