CAIE IGCSE Chemistry 6.4.1 Roman Numeral to Indicate the Questions
Interpret Roman numerals as oxidation numbers for variable-charge metals and calculate them from formulae and ion charges.
- Syllabus
- 2026–2028
- Course
- Chemistry 0620
Exam points
- state that a Roman numeral gives the named element’s oxidation number, not an atom count
- use ion charges and formula subscripts to determine an oxidation number
- deduce the oxidation number of a variable-charge metal in a compound
- write a full compound name with the correct Roman numeral
CAIE IGCSE Chemistry 6.4.1 Roman Numeral to Indicate the Questions question 1
[Maximum number: 1]
Chromium forms the compound chromium(III) sulfate.
What does the (III) represent?
A
the charge on a sulfate ion
B
the number of chromium ions combined with one sulfate ion
C
the number of sulfate ions combined with one chromium ion
D
the oxidation state of chromium
D
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