$F e_{2} {(S O_{4})}_{3}$ is the chemical formula of

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Iron sulphate

Iron sulphide

Ferric sulphate

Ferrous sulphate

answer is B.

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Detailed Solution

F e_{2} {(S O_{4})}_{3}

is the chemical formula of ferric sulphate.
In the cris-cross method, we write oxidation state of cation in the subscript of anion and of anion in the subscript of cation irrespective of its charge.
By the criss-cross method, we can find the formula of the compound as

F e_{2} {(S O_{4})}_{3}

Fe3+    SO42-
🡧🡦
2    3[7]
In the given compound, the oxidation state of iron is +3 and of sulphate ion is -2. The iron with oxidation state +3 is known as a ferric ion. If we gather both parts of cation and anion, then the name of the inorganic compound is ferric sulphate.

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