Question

When is the oxidation state of a metal indicated in the name of a compound?

A. When the charge on the nonmetal is not known

B. When the metal can exist in more than one oxidation state
C. When the compound being named is a covalent compound

D. When a prefix is used to indicate the number of metal atoms

Answer 1

B

Step-by-step explanation:

The oxidation state is present in metals that have multiple oxidation states. Most transition metals have multiple oxidation states. Such as, Iron(II) and Iron (III).

Answer 2

When the metal can exist in more than one oxidation state

Step-by-step explanation:

When metal exhibit more than one oxidation sate, we have to write the oxidation number of the metal in front of it to for a better clarity.

Most of the transition metals exhibit more than one oxidation state due to presence of d electrons.

For example the oxidation state of iron are "+2 and +3"

The oxidation state of copper are "+1 and +2"

The oxidation state of Mn are :"+2", +4, +7.

so we generally write there oxidation state in roman

For Mn compound in +2 oxidation state we write Mn(II)

For Mn compound in +7 oxidation state we write Mn(VII)