Oxidation States and Chromium Compounds

The video tutorial explains how to determine the oxidation number for each element in chromium(II) oxide (CrO). It begins by identifying CrO as a neutral compound, meaning the sum of its oxidation numbers is zero. The video highlights that chromium, a transition metal, can have various oxidation states, but in CrO, it is +2 due to oxygen's consistent -2 oxidation state. This results in the compound being named chromium(II) oxide. The tutorial concludes by reiterating the calculation and confirming the oxidation numbers add up to zero.

What is the overall charge of a neutral compound like Chromium(II) Oxide?

• Depends on the elements

• Zero

• Negative

• Positive

Why is chromium not found in the standard list of oxidation rules?

• It is a noble gas

• It is a transition metal with variable oxidation states

• It is a non-metal

• It always has a fixed oxidation state

What is the typical oxidation number assigned to oxygen in compounds?

• +1

• +2

• -2

• -1

How does the oxidation number of oxygen help in determining the oxidation state of chromium in CrO?

• It directly gives the oxidation state of chromium

• It only helps in ionic compounds

• It helps by providing a reference point for charge balance

• It doesn't help at all

What is the oxidation number of chromium in Chromium(II) Oxide?

• +4

• +1

• +2

• +3

Why is the compound named Chromium(II) Oxide?

• Because it is a diatomic molecule

• Because it contains two chromium atoms

• Because it is a binary compound

• Because chromium has an oxidation number of +2