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Which one of the following formula represents a first-order reaction?

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Which one of the following formula represents a first-order reaction?
A. `K = (x)/(t)`
B. `K = (1)/(2t)[(1)/((a - x)^(2)) - (1)/(a^(2))]`
C. `K = (2.303)/(t)"log"_(10)(a)/((a - x))`
D. `K = (1)/(t) (x)/(a(a - x))`
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Correct Answer - C
For Ist-order reaction
`K = (2.303)/(t)"log"_(10) (a)/((a-x))`
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