The ionic compound formed by the ions ${Fe}^{3 +}$ and $({SO}_{4})^{2 -}$ has the chemical formula ________.

${F e}_{2} S O_{4}$

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${F e}_{3} (S O_{4})_{2}$

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${F e}_{2} (S O_{4})_{3}$

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${F e}_{3} S O_{4}$

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Solution

The correct option is C
${F e}_{2} (S O_{4})_{3}$

An ionic compund consists of an anion and a cation. Here cation is ${Fe}^{3 +}$ and anion is $({SO}_{4})^{2 -}$ .

$\begin{matrix} Symbol & Charge Fe & 3 {SO}_{4} & 2 \end{matrix}$
In order to balance the overall charge, the short-cut method is to cross multiply the charges. Thus, the two ${Fe}^{3 +}$ will combine with three $({SO}_{4})^{2 -}$ . Hence, the formula is ${Fe}_{2} ({SO}_{4})_{3}$ .

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Question 13
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The ionic compound formed by the ions Fe3+ and (SO4)2− has the chemical formula ________.

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