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Modern Periodic Table

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Question

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The formula of potassium trioxalatoaluminate ( III ) is _____.

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Solution

Cation is Potassium. Oxalate formula is $C_{2} O_{4}^{2 -}$ . It is $3$ in number. Metal is Aluminium with oxidation state $= 3$ .
Write cation first and then anion.
So formula is $K_{3}^{+} [A l (C_{2} O_{4})_{3}]^{3 -}$
$K_{3} [A l (C_{2} O_{4})_{3}]$

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Q. Using IUPAC norms write the formulae for the following:

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