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CAIE A-Level Chemistry 6.1.5 Roman Numerals in Compound Names

Practise interpreting the Roman numeral in a systematic name as the oxidation number of the specified element.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • read the Roman numeral as the oxidation number of the named element, not its atom count or ionic charge
  • use the compound formula and charge balance to check that the stated oxidation number is consistent

6.1.5 Oxidation Numbers in Compound Names question 1

[Maximum number: 1]

The compound potassium bismuthate (V),KBiO3(\mathrm{V}), \mathrm{KBiO}_{3}, is a powerful oxidising agent.
What is the significance of the (V) in potassium bismuthate (V) ?

A

It is the oxidation number of the bismuth atom.

B

It is the charge of the bismuthate ion.

C

It is the oxidation number of the bismuthate ion.

D

It is the sum of the charges of the two ions present.

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