Answer :
The oxidation number of specified element in each compound or polyatomic ion is given below :
i) C in ZnCO3 : +4
ii) Fe in Fe(NO3)2 : +2
iii) Cl in ClF4- : +5
iv) S in S2O3 2- : +2
Simply put, an element's oxidation number is the number assigned to it in a chemical combination. The number of electrons that atoms in a molecule can share, lose, or gain while forming chemical connections with other atoms of a different element is known as the oxidation number.
Oxidation state is another name for oxidation number. However, depending on whether or not we are taking into account the electronegativity of the atoms, these phrases might occasionally have a different meaning. In coordination chemistry, the phrase "oxidation number" is commonly employed.
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