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এলুমিনিয়াম নিষ্কাশন করা হয়-

{Al}_{2} O_{3} . 2 H_{2} O

{Al}_{2} O_{3}

{Al}_{2} O_{3} . 3 H_{2} O

{AlF}_{2} O_{3} . 3 NaF

None

ANS : 1

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