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16 Oxidation Numbers MCQ2

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Questions and Answers

What is the oxidation number of an uncombined element?

Variable

0 (correct)

-1

What is the sum of oxidation numbers in a molecule?

Depends on the molecule

Zero (correct)

Non-zero

Variable

What is the oxidation number of oxygen in peroxides?

-1 (correct)

-2

What is the oxidation number of Group 1 elements in compounds?

+1 Signup and view all the answers

What is the oxidation number of copper in its compounds?

+1, +2 Signup and view all the answers

What is the oxidation number of iron in its compounds?

+2, +3, +6 Signup and view all the answers

What is the oxidation number of manganese in its compounds?

+2, +3, +4, +6, +7 Signup and view all the answers

What is the oxidation number of chromium in its compounds?

+2, +3, +6 Signup and view all the answers

What is the oxidation number of oxygen when bonded to fluorine?

+2 Signup and view all the answers

What is the oxidation number of an ion of an element?

the same as its charge Signup and view all the answers

Study Notes

Oxidation Numbers

The oxidation number is the charge an atom appears to have when electrons are distributed according to certain rules.
Uncombined elements have an oxidation number of zero.

Rules for Assigning Oxidation Numbers

The sum of oxidation numbers in a molecule is zero.
The oxidation number of an ion of an element is the same as its charge.
The sum of the oxidation numbers of all atoms in a complex ion equals the charge on that ion.

Oxidation Numbers of Specific Elements

Hydrogen has an oxidation number of +1 when bonded.
Oxygen has an oxidation number of -2, except in peroxides where it's -1, and when bonded to fluorine, it's +2.
Group 1 elements have an oxidation number of +1 in compounds.
Group 2 elements have an oxidation number of +2 in compounds.
Halogens have an oxidation number of -1 when bonded to a less electronegative atom.

Transition Metal Oxidation States

Chromium: +2, +3, +6
Manganese: +2, +3, +4, +6, +7
Iron: +2, +3, +6
Copper: +1, +2

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Description

Learn about the rules of oxidation numbers, including transition metals and their oxidation states, and how to determine the oxidation number of an atom in a molecule.