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Oxidation Numbers

1.
What is the sum of the oxidation states in 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 $H_2$?
1. -1
2. +1
3. 0
4. +2
3.
What is the oxidation number of Xe, and what does it 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 $H_2O$?
1. +2
2. -2
3. +1
4. 0
5.
What is the oxidation number of iron in FeO?
1. +2
2. +3
3. -2
4. -3

6.
What is the oxidation number of chromium in $CaCrO_4$?
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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