CAIE IGCSE Chemistry 3.1.6 Deduce the formula of an ionic

Cambridge IGCSE Chemistry 0620 syllabus for exams in 2026, 2027 and 20282026–2028

Practise using ion charges, group patterns and diagrams to deduce formulae for ionic compounds, acids and complex ions.

How this is tested

deduce ion or compound formulae from charge information, including SO3^2- and zincate ions

[Maximum number: 1]

This question is about metals.

Zinc oxide neutralises both acids and bases.

When zinc oxide neutralises aqueous sodium hydroxide, sodium zincate is formed.

The formula of the zincate ion is $\mathrm{ZnO}_{2}{ }^{2-}$ .
Deduce the formula of sodium zincate.

How this is tested

Question 6(d)(ii)