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Blue Vitriol-এর সংকেত কোনটি?

Z n S O_{4 .} 7 H_{2} O

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

C u S O_{4 .} 5 H_{2} O

M g S O_{4 .} 7 H_{2} O

ANSWER : 3

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