Oxidation Numbers (Leaving Cert Chemistry): Quizzes

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Oxidation Numbers
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What is an oxidation number?

A value showing charge if e⁻ distributed

What is the oxidation number of oxygen in O2O_2 gas?

0

What is the oxidation number of Fe3+Fe^{3+} ion in FeCl3FeCl_3?

+3

What is the oxidation number of oxygen in hydrogen peroxide (H2O2H_2O_2)?

-1

What is the oxidation number of hydrogen in sodium hydride (NaH)?

-1

What must the sum of oxidation numbers equal in a neutral compound?

0

What is the oxidation number of nitrogen in NO3−NO_3^-?

+5

What is the oxidation state of iron in Iron(III) oxide (Fe2O3Fe_2O_3)?

+3

What is the oxidation number of oxygen in OF2OF_2?

+2

What does an increase in oxidation number indicate?

Oxidation

In 2H2+O2→2H2O2H_2 + O_2 → 2H_2O, what happens to oxygen?

Reduced (0 to -2)

What is the oxidation number of manganese in KMnO4KMnO_4?

+7

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