What is the correct formula of green vitriol?

$Z n S O_{4} .2 H_{2} O$

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$F e_{2} (S O_{4})_{3} .7 H_{2} O$

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$Z n S O_{4} .5 H_{2} O$

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$F e S O_{4} .7 H_{2} O$

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Solution

The correct option is D
$F e S O_{4} .7 H_{2} O$

Ferrous ions are $F e^{2 +}$ , hence the correct formula will be $F e S O_{4} .7 H_{2} O$

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