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

Use marked Edexcel IAL Chemistry questions to balance cation and anion charges, preserve polyatomic ions, and write neutral formulae from oxidation numbers.

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.

[Maximum number: 1]

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

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

$\mathrm{BaFeO}_{3}$

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

$\mathrm{BaFeO}_{4}$

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