Oxidation Numbers of Phosphorus

The video tutorial explains how to determine the oxidation number for phosphorus using specific rules. It begins by discussing free elements, which have an oxidation number of zero, and provides examples like Na, Fe, and P4. The tutorial then explores how phosphorus can have different oxidation numbers when bonded to other elements, such as oxygen, where it can have an oxidation number of +5. The video also examines phosphorus in various compounds, showing how its oxidation number changes based on the elements it bonds with. The tutorial concludes with a summary of the oxidation numbers for phosphorus.

What is the oxidation number of phosphorus when it is in its elemental form?

• +5

• -3

• +3

• 0

Which of the following is a free element with an oxidation number of zero?

• Na

• NaCl

• H2O

• P4

When phosphorus is bonded to oxygen, what is the typical oxidation state of oxygen?

• 0

• +2

• -1

• -2

In a compound where phosphorus is bonded to oxygen, if the total oxidation state of oxygen is -10, what must be the total oxidation state of phosphorus?

• +10

• -10

• 0

• +5

How does the oxidation number of phosphorus change when it goes from a free element to being bonded with oxygen?

• It becomes negative

• It remains the same

• It decreases

• It increases

What is the oxidation number of phosphorus in a compound where it is bonded to sodium?

• +3

• -3

• +1

• 0

In a compound with chlorine, what is the oxidation number of phosphorus if chlorine has an oxidation state of -1?

• +5

• +3

• -3

• 0

What is the oxidation number of phosphorus when it is bonded to fluorine, which is highly electronegative?

• 0

• -5

• +5

• +3

In a compound with sodium, what is the oxidation number of sodium?

• +1

• -1

• 0

• +2

What is the oxidation number of phosphorus in a compound where it is bonded to three chlorine atoms?

• 0

• -3

• +3

• +5