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JEE Main levelSingle correct optionDifficulty 2 of 3bn125

What is the Stock-notation name of $FeSO X_{4} \cdot 7 H X_{2} O$ ?

Airon(III) sulfate heptahydrate
Biron(II) sulfate heptahydrate
Ciron(II) sulfate hexahydrate
Diron(II) sulfite heptahydrate

Answer: B

Sulfate is

- 2

and there is one sulfate per Fe, so Fe is

+ 2

. Seven waters are hepta-: iron(II) sulfate heptahydrate.

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