Question

Among K, Ca, Fe and Zn, the element which can form more than one binary compound with chlorine is

(a) Fe

(b) Zn

(c) K

(d) Ca

Answer 1

Correct option (a) Fe

Explanation :

A binary compound is one made of two different elements. These can be one of each element such as CuCl₂ or FeO. These can also be several of each element such as Fe₂O₃, or SnBr₄.

Metals which have variable oxidation number can form more than one type of binary compound like Fe shows the oxidation state +2 and +3. Hence it forms two types of binary compounds. e.g., FeCl₃, FeCl₃.