Assigning Oxidation Numbers

Chemistry

Grade 10th

AP Chem

IB Chem

IGCSE Chem

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1. What is the oxidation number on N in Li₃N?

Rule
2e. Elements in groups 1,2,and 3 have a charge of +1,+2,+3.
Li is in group 1, N needs to be -3 to balance.

Explanation

Rule
2e. Elements in groups 1,2,and 3 have a charge of +1,+2,+3.
Li is in group 1, N needs to be -3 to balance.

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About This Quiz

This quiz focuses on determining oxidation numbers in various chemical compounds, assessing key skills in identifying oxidation states in different contexts. It is essential for students learning redox chemistry.

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2. What is the oxidation number for Mn in MnCl₂?

Rule
2d. The most electronegative will have an oxidation number equal to its charge as an ion. (highest E.N. is in the upper right)

Explanation

Rule
2d. The most electronegative will have an oxidation number equal to its charge as an ion. (highest E.N. is in the upper right)

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4. What is the oxidation number on N in HNO₃?

Rule
2e. Elements in groups 1,2,and 3 have a charge of +1,+2,+3. (H= +1)
2g. Oxygen in a compound is -2.
Separate out the poly atomic NO3 and its charge is -1
Oxygen grand total is -6 so nitrogen needs to be +6 but the -1 charge brings it down to +5

Explanation

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8. What is the oxidation number on N in N₂O₅?

Rule 2g. Oxygen in a compound is -2. Grand total oxygen equals -10. Nitrogen has to be +10 to balance, but there are two of them. Each one needs to be +5

Explanation

Rule 2g. Oxygen in a compound is -2. Grand total oxygen equals -10. Nitrogen has to be +10 to balance, but there are two of them. Each one needs to be +5

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