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লিমোনাইটের সংকেত হলো-

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

2 F e_{2} O_{3} . 3 H_{2} O

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

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

ANS : 2

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