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Questions and Answers
What is the oxidation number of a pure element such as O₂?
What is the oxidation number of a pure element such as O₂?
What is the oxidation number of sodium (Na) in the compound NaCl?
What is the oxidation number of sodium (Na) in the compound NaCl?
In which of the following cases does oxygen have an oxidation number of -1?
In which of the following cases does oxygen have an oxidation number of -1?
What is the oxidation number of hydrogen when bonded to metals?
What is the oxidation number of hydrogen when bonded to metals?
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What is the sum of oxidation numbers in a neutral compound?
What is the sum of oxidation numbers in a neutral compound?
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Study Notes
Oxidation Numbers
- Oxidation number (or oxidation state) represents degree of oxidation or reduction
- It indicates number of electrons gained, lost, or shared during bond formation
- Can be positive, negative, or zero
- Different rules for assigning oxidation states
Key Rules
- Pure elements: Oxidation number is zero (e.g., O₂, H₂, N₂)
- Monatomic ions: Oxidation number equals ion charge (e.g., Na⁺ = +1, Cl⁻ = -1)
- Oxygen: Usually -2, but -1 in peroxides (e.g., H₂O₂)
- Hydrogen: +1 when bonded to non-metals, -1 when bonded to metals
- Alkali metals (Group 1): +1 in compounds
- Alkaline earth metals (Group 2): +2 in compounds
- Fluorine: Always -1 in compounds
- Sum of oxidation numbers: Zero in neutral compounds; equals charge in polyatomic ions
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Description
Test your knowledge about oxidation numbers and their rules. This quiz covers the definition, examples, and key rules for assigning oxidation states in different types of compounds. Understand the significance and application of oxidation numbers in chemical reactions.
