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ক্রায়োলাইটের সংকেত কোনটি?

A l_{2} O_{3} . 3 H_{2} O

A l_{2} O_{3} . 2 S i O_{2} 2 H_{2} O

A l_{2} O_{3} . 2 H_{2} O

A l F_{3} . 3 N a F

ANS : 4

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