10 mL of water required 1.47 mg of $K _{2}Cr _{2}O _{7}$ (M. wt. = 294) for oxidation of dissolved organic matter in presence of acid. Then the C.O.D of water sample is:
2.44 ppm
24 ppm
32 ppm
1.6 ppm
$ Number \ of \ milliequivalent $ = $\dfrac{weight \ in \ mg}{Equivalent\ weight}$