Microbial nitrogen cycle

What is the oxidation state of nitrogen in ammonia (NH₃)?

• -3

• 0

• +3

• +5

What is the oxidation state of nitrogen in nitrate (NO₃⁻)?

• -3

• 0

• +3

• +5

What is the oxidation state of nitrogen in nitrite (NO₂⁻)?

• -3

• +1

• +3

• +5

What is the oxidation state of nitrogen in molecular nitrogen (N₂)?

• -3

• 0

• +3

• +5

In the process of nitrification, ammonia (NH₃) is converted to which compound with a higher oxidation state?

• Nitrogen gas (N₂)

• Nitrite (NO₂⁻)

• Ammonium ion (NH₄⁺)

• Dinitrogen oxide (N₂O)

Which nitrogen compound has an oxidation state of +4?

• Nitrite (NO₂⁻)

• Nitrous oxide (N₂O)

• Nitrogen dioxide (NO₂)

• Ammonia (NH₃)

Which process reduces the oxidation state of nitrogen from +5 to 0?

• Nitrification

• Denitrification

• Nitrogen fixation

• Ammonification

What is the oxidation state of nitrogen in hydroxylamine (NH₂OH), an intermediate in ammonia oxidation?

• -3

• -1

• +1

• +3

Which process changes nitrogen from the oxidation state 0 to -3?

• Ammonification

• Nitrogen fixation

• Nitrification

• Denitrification

In which nitrogen compound is the nitrogen oxidation state +2?

• Nitric oxide (NO)

• Nitrite (NO₂⁻)

• Ammonia (NH₃)

• Nitrous oxide (N₂O)