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## Oxidation Numbers

1.
What represents the total oxidation state for an ionic compound?
1. It equals the charge of the cation.
2. It equals the charge of the anion.
3. It is equivalent to the magnitude of the ion with the higher charge.
4. It equals zero.

2.
What is the oxidation number of hydrogen in a molecule of hydrogen?
1. -1
2. +1
3. 0
4. +2
3.
What would the oxidation number of a xenon atom be, and what would this oxidation number suggest?
1. Its oxidation number is 8, making it inert.
2. Its oxidation number is 0, making it nonreactive.
3. Its oxidation number is 7, making it reactive.
4. Its oxidation number is 0, making it reactive.

4.
What is the oxidation number of hydrogen in one molecule of water?
1. +2
2. -2
3. +1
4. 0
5.
What is the oxidation number of iron in iron (II) oxide?
1. +2
2. +3
3. -2
4. -3

6.
What is the oxidation number of chromium in calcium chromate?
1. +2
2. -2
3. -8
4. +6
7.
What is the oxidation state of the ammonium ion present in $NH_4Cl$?
1. +5
2. +1
3. -1
4. -4

8.
What is the oxidation number of chlorine in $KClO_4$?
1. +5
2. +7
3. -8
4. +1
9.
What is the oxidation number of phosphorus in $K_3 PO_4$? Show your work.

10.
The oxidation number of carbon in NaCN is 2+.
1. True
2. False
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