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গ্লুবার লবণের আণবিক সংকেত কোনটি?

N a_{2} S O_{4} . 7 H_{2} O

N a_{2} S O_{4} . 5 H_{2} O

N a_{2} S O_{4} . 10 H_{2} O

N a_{2} S O_{4} . 8 H_{2} O

ANS : 3

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