Calc Oxidation Numbers

The formula of the Chromate ion is

• CrO₂

• CrO₄^-

• Cr₂O₄^-

• CrO₃^-

The Permanganate ion is

• MnO₂^2-

• MnO₃^-

• MnO₄^-

• Mn₂O₄^-

The phosphate ion is

• PO₂^3-

• PO₃^3-

• P₂O₅^-

• PO₄^3-

The thiosulfate ion is

• SO₄^2-

• S₂O₃^2-

• SO₃^2-

• HS^-

The carbonate ion is

• HCO₃^-

• CO₃^-

• CO₃^2-

• HCO₃⁺

The oxidation number of an element is

• zero as a element is always neutral

• the charge on the element.

• variable, it depends on the element

• negative for non-metals and positive for metals

The sum of all oxidation numbers in a neutral compound is ___.

• 0
• 1
• -1
• depends on the compound

What element's don't have oxidation numbers?

• alkali metals
• noble gases
• halogens
• alkaline earth metals

What is oxidation number of Cr in Cr₂O_7^2-?

• -2
• +2
• +6
• +12

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1

What is the charge of the cobalt(IV) ion?

• +4
• -4
• +6
• +5