Question

Name the three polyatomic ions having –2 charge and derive chemical formula using them as anion and sodium as cation.

Answer 1

Answer:

your polyatomic ions are SO4^{2-} (sulphate), CO3^{2-}(carbonate) and CrO4^{2-}(chromate)

valency of Na is +1,

so the compounds formed are:

Na2SO4, Na2CO3, Na2CrO4

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