Oxidation States of Hydrogen

The video tutorial explains the oxidation numbers for hydrogen. It starts by discussing hydrogen as a free element with an oxidation state of zero, similar to other elements on the periodic table. The video then covers diatomic elements like H2 and Cl2, which also have an oxidation state of zero. When hydrogen is bonded to non-metals, it typically has an oxidation number of +1, as seen in HCl. Conversely, when hydrogen is bonded to metals or boron, it has an oxidation number of -1, as in sodium hydride (NaH). The tutorial concludes with a summary of these concepts.

What is the oxidation state of hydrogen when it is a free element?

• -1

• 0

• +1

• +2

Which of the following is considered a diatomic element?

• Na

• H2

• Fe

• C

What is the oxidation number of hydrogen in HCl?

• +2

• +1

• 0

• -1

When hydrogen is bonded to chlorine, what is the oxidation state of chlorine?

• +2

• 0

• -1

• +1

In which compound does hydrogen have an oxidation state of -1?

• H2

• HCl

• H2O

• NaH

What is the oxidation state of sodium in sodium hydride (NaH)?

• +1

• -1

• +2

• 0

When hydrogen is bonded to metals, what is its typical oxidation state?

• +2

• -1

• +1

• 0

Which element is hydrogen bonded to in NaH?

• Sodium

• Oxygen

• Chlorine

• Iron

What is the oxidation state of hydrogen when it is bonded to boron?

• 0

• -1

• +2

• +1

What determines the oxidation state of hydrogen in a compound?

• The pressure

• The type of bond

• The element it is bonded to

• The temperature