Acidified aqueous potassium manganate(VII) is a purple solution. What does the (VII) in the name potassium manganate(VII) represent?

the charge on the potassium ion

the charge of the manganate ion

the number of ions in the compound

the oxidation number of manganese

Chemistry

IGCSE&ALevel

CAIE

Exam No：0620_s23_qp_13 Year：2023 Question No：14

Answer:

6.4.1. Use a Roman numeral to indicate the oxidation number of an element in a compound

6.4.10. Identify redox reactions by the colour changes involved when using acidified aqueous potassium manganate(VII) or aqueous potassium iodide

6.4.11. Define an oxidising agent as a substance that oxidises another substance and is itself reduced

6.4.12. Define a reducing agent as a substance that reduces another substance and is itself oxidised

6.4.13. Identify oxidising agents and reducing agents in redox reactions

6.4.2. Define redox reactions as involving simultaneous oxidation and reduction

6.4.3. Define oxidation as gain of oxygen and reduction as loss of oxygen

6.4.4. Identify redox reactions as reactions involving gain and loss of oxygen

6.4.5. Identify oxidation and reduction in redox reactions

6.4.6.1. loss of electrons

6.4.6.2. an increase in oxidation number

6.4.7.1. gain of electrons

6.4.7.2. a decrease in oxidation number

6.4.8. Identify redox reactions as reactions involving gain and loss of electrons

6.4.9.1. the oxidation number of elements in their uncombined state is zero

6.4.9.2. the oxidation number of a monatomic ion is the same as the charge on the ion

6.4.9.3. the sum of the oxidation numbers in a compound is zero

6.4.9.4. the sum of the oxidation numbers in an ion is equal to the charge on the ion