UPTET Paper 2 Math and Science 2016 Solved Paper

Concept:In metal carbonyls, carbon monoxide (CO) is a neutral ligand, so its oxidation state is taken as 0. The overall charge on the molecule is zero.Explanation:Let the oxidation state of Iron in Fe(CO)$_{5}$ be $x$.Since each CO contributes 0, the total contribution from five CO is $0 \times 5 = 0$.The sum of oxidation states in a neutral molecule equals zero: $x + 0 = 0$.Thus, $x = 0$.Answer:The oxidation state of Iron in Fe(CO)$_{5}$ is 0, which corresponds to option A.