Which one of the following formula represents a first order reaction

1.	Which one of the following formula represents a first order reaction [MP PMT 1999]
A.	\[K=\frac{x}{t}\]
B.	\[K=\frac{1}{2t}\left[ \frac{1}{{{(a-x)}^{2}}}-\frac{1}{{{a}^{2}}} \right]\]
C.	\[K=\frac{2.303}{t}{{\log }_{10}}\frac{a}{(a-x)}\]
D.	\[K=\frac{1}{t}\,\frac{x}{a(a-x)}\]
Answer» D. \[K=\frac{1}{t}\,\frac{x}{a(a-x)}\]

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