# Assigning Oxidation Numbers

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• 1.

### What is the oxidation number on N in Li3N?

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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• 2.

### What is the oxidation number on N in N2O5?

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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• 3.

### What is the oxidation number on Hydrogen?

Explanation
Rule
2e. Elements in groups 1,2,and 3 have a charge of +1,+2,+3.

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• 4.

### What is the oxidation number on N in HNO3?

Explanation
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

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• 5.

### What is the oxidation number for Cu in CuSO4?

Explanation
SO4 is a polyatomic with a -2 charge. Cu must have a +2 to balance

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• 6.

### What is the oxidation number for I2?

Explanation
Rule
2a. Any uncombined, single atoms or diatomics are always zero.

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• 7.

### What is the oxidation number for Mn in MnCl2?

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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• 8.

### What is the oxidation number on Cr4+?

Explanation
Rule
2b. The oxidation number of an ion is its charge.

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• 9.

### What is the oxidation number on F in IF7?

Explanation
Rule
2c. In a compound Fluorine is always -1.

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• 10.

### The sum of all oxidation numbers must equal?

Explanation
Rule
3a. The sum of all oxidation numbers must equal zero.

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• Current Version
• Jan 17, 2024
Quiz Edited by
ProProfs Editorial Team
• Apr 11, 2013
Quiz Created by
Kkujat1

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