Question

Element X reacts with iron to form two different compounds with the formulas FeX and Fe2X3. To which group on the Periodic Table does element X belong?

Answer 1

Answer: Element X belongs to the group 16 of the periodic table.

Explanation: We are given that element X combines with iron to form two different compounds having formulas FeX and
`Fe_2X_3`

As, Iron forms a cation which shows variable oxidation state of +2 and +3. Hence, to form a compound iron needs an anion.

• In compound
  `Fe_2X_3`

The ratio of iron and Element X is 2 : 3

Hence, the oxidation state of iron = +3 and

Oxidation state of element X = -2

• For the compound FeX,

The ratio of Iron and Element X = 1 : 1

Here, the oxidation state of iron =+2

Oxidation state of element X = -2

The elements having the oxidation state -2 belongs to the Group 16.