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সাদা ভিট্রিয়লের সংকেত-

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

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

N a_{2} C O_{3} . 10 H_{2} O

N a_{2} B_{4} O_{7} . 10 H_{2} O

ANS : 2

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