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Edexcel A-Level Chemistry AS 8.4 Write Formulae Given Oxidation Numbers Questions

Write each ion with its charge, choose the smallest whole-number ratio that gives zero overall charge and preserve polyatomic ions with brackets where needed.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
AS

Exam points

  • Combine cation and anion charges in the smallest ratio to produce a neutral formula.
  • Deduce double-salt formulae while preserving sulfate or other polyatomic-ion units.

Edexcel A-Level Chemistry AS 8.4 Write Formulae Given Oxidation Numbers Questions question 1

[Maximum number: 1]

What is the formula of barium(II) ferrate(VI)?

A

Ba2FeO3\mathrm{Ba}_{2} \mathrm{FeO}_{3}

B

BaFeO3\mathrm{BaFeO}_{3}

C

Ba2FeO4\mathrm{Ba}_{2} \mathrm{FeO}_{4}

D

BaFeO4\mathrm{BaFeO}_{4}

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