Question

A compound is made up of iron and oxygen, only. The ratio of iron ions to oxide ions is 2:3 in this compound. The IUPAC name for this compound is

(1) triiron dioxide (3) iron(III) oxide
(2) iron(II) oxide (4) iron trioxide

Answer 1

A compund is made up of iron and oxygen, only. The ratio of iron ions to oxide irons is 2:3 in this compund. The IUPAC name for this compound is Iron (III) Oxide.

Answer 2

Answer: The correct option is 3.

Explanation: We are given a compound which is made up of iron and oxygen only. The ratio of the two are given as:

`\frac{\text{iron ions}}{\text{oxide ions}}=(2)/(3)`

This means that, number of iron ions are 2

Number of oxide ions are 3

From the above information, the formula becomes :
`Fe_2O_3`

The valency of iron = 3

Valency of oxide = 2

This compound is named as iron (III) oxide.

Hence, the correct option is 3