Oxidation Numbers and Hypophosphite Ion

The video tutorial explains how to determine the oxidation numbers for each atom in the hypophosphite ion (PO2 3-). It begins by introducing the concept of oxidation numbers and the rules used to find them. The oxidation number of oxygen is identified as -2, and the video demonstrates how to calculate the oxidation number of phosphorus by ensuring the sum of oxidation numbers equals the ion's charge. The tutorial concludes with a recap of the process and the final oxidation numbers for the elements in the ion.

What is the main objective of the video?

• To demonstrate a chemical reaction

• To find the oxidation numbers for each atom in the hypophosphite ion

• To discuss the properties of phosphorus

• To explain the concept of ions

What is the typical oxidation number assigned to oxygen?

• -2

• -1

• +2

• 0

How many oxygen atoms are present in the hypophosphite ion?

• Four

• One

• Two

• Three

What is the total oxidation number of the two oxygen atoms in the hypophosphite ion?

• +2

• 0

• -2

• -4

What is the oxidation number of phosphorus in the hypophosphite ion?

• -1

• +3

• 0

• +1

Which rule is used to find the oxidation number of phosphorus?

• Phosphorus always has an oxidation number of +3

• The sum of oxidation numbers in a molecule is zero

• The sum of oxidation numbers in an ion equals the charge of the ion

• Oxygen always has an oxidation number of -1

What is the charge on the hypophosphite ion?

• -1

• -3

• 0

• -2