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# The temperature coefficient of a reaction is :

$(A)\;\text{The rate constant at a fixed temperature.} \\ (B)\;\text{The ratio of rate constant at two temperatures} \\(C)\;\text{The ratio of rate constant differeing by$10^{\circ}$preferably at$25^{\circ}$and$35^{\circ}C$} \\(D)\;\text{None of these}$

$\large\frac{K_t+10}{K_t}$$=2,3$
(ie) temperature coefficient is the ratio of rate constant at two temperature differing by $10^{\circ}C$, preferably at $35^{\circ}C$ and $25^{\circ}$
Hence C is the correct answer.