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Oxidation Numbers Quiz

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Questions and Answers

What is the oxidation state of chlorine in Cl^-?

The oxidation state of chlorine in Cl^- is -1.

Determine the oxidation state of nitrogen in NO2^-.

The oxidation state of nitrogen in NO2^- is +3.

What is the ionic charge of calcium in Ca^2+?

The ionic charge of calcium in Ca^2+ is +2.

Identify the oxidation state of sulfur in H2S.

The oxidation state of sulfur in H<del>2</del>S is -2. Signup and view all the answers

What is the oxidation state of phosphorus in P4?

The oxidation state of phosphorus in P<del>4</del> is 0. Signup and view all the answers

Determine the oxidation state of iron in Fe(ClO2)3.

The oxidation state of iron in Fe(ClO<del>2</del>)<del>3</del> is +3. Signup and view all the answers

What is the oxidation state of manganese in KMnO4?

The oxidation state of manganese in KMnO<del>4</del> is +7. Signup and view all the answers

Identify the charge of sodium in Na2S.

The charge of sodium in Na<del>2</del>S is +1. Signup and view all the answers

What is the oxidation number of nitrogen in $N_2O_3$?

The oxidation number of nitrogen in $N_2O_3$ is +3. Signup and view all the answers

Determine the oxidation number of sulfur in $H_2SO_4$.

The oxidation number of sulfur in $H_2SO_4$ is +6. Signup and view all the answers

What is the oxidation number of carbon in methane, $CH_4$?

The oxidation number of carbon in $CH_4$ is -4. Signup and view all the answers

Find the oxidation number of carbon in carbon monoxide, $CO$.

The oxidation number of carbon in $CO$ is +2. Signup and view all the answers

What is the oxidation number of sodium in sodium chloride, $NaCl$?

The oxidation number of sodium in $NaCl$ is +1. Signup and view all the answers

Determine the oxidation state of manganese in $MnO_2$.

The oxidation state of manganese in $MnO_2$ is +4. Signup and view all the answers

What is the oxidation number of sulfur in the sulfate ion, $SO_3^{2-}$?

The oxidation number of sulfur in $SO_3^{2-}$ is +4. Signup and view all the answers

Find the oxidation state of magnesium in the ion $Mg^{2+}$.

The oxidation state of magnesium in $Mg^{2+}$ is +2. Signup and view all the answers

Study Notes

Oxidation Numbers

Pure elements have an oxidation number of 0.
Monatomic ions have an oxidation number equal to their charge.
Fluorine's oxidation number is always -1 in compounds.
Oxygen's oxidation number is -2, except in peroxides (-1) or when combined with fluorine (+1 or +2).
Hydrogen's oxidation number is +1, except when combined with a metal (-1).
Group 1 elements are +1, Group 2 elements are +2, and aluminum is +3 in compounds.
The sum of oxidation numbers in a neutral compound is 0.
The sum of oxidation numbers in a polyatomic ion equals the ion's charge.

Oxidation Number Examples

N in N₂O₃: +3
S in H₂SO₄: +6
C in CH₄: -4
Mn in MnO₂: +4
S in SO₃²⁻: +4
Mg²⁺: +2
Cl⁻: -1
O₂: -2
P₄: 0
Na in Na₂S: +1

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Description

Test your knowledge of oxidation numbers with this quiz! From understanding the rules to applying them in examples, this quiz covers various aspects of oxidation states in compounds. Challenge yourself to see how well you know oxidation numbers.