Oxidation Numbers and Compounds

The video tutorial explains how to find the oxidation number of manganese (Mn) in the compound MnO2. It starts by stating that the sum of oxidation numbers in a neutral compound is zero. Oxygen is typically -2, and the unknown oxidation number of Mn is represented as x. By setting up an equation, x + 2(-2) = 0, the oxidation number of Mn is calculated to be +4. An alternative method is also mentioned for quick verification. The video concludes with a brief summary of the process.

What is the sum of oxidation numbers in a neutral compound?

• It is always positive.

• It is always negative.

• It is zero.

• It depends on the compound.

What is the usual oxidation state of oxygen in compounds?

• +1

• +2

• -2

• 0

In the expression x + 2(-2) = 0, what does x represent?

• The oxidation number of manganese

• The number of oxygen atoms

• The total charge of the compound

• The oxidation number of oxygen

How many oxygen atoms are present in MnO2?

• One

• Three

• Four

• Two

What is the oxidation number of Mn in MnO2?

• +5

• +4

• +3

• +2

What is an alternative method to find the oxidation number of Mn in MnO2?

• By balancing the total charge to zero

• By considering Mn as an ion

• By using the atomic number of Mn

• By assuming Mn has a charge of -4