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চায়না ক্লে কোনটি?

C a O . A I_{2} O_{2} . S i O_{4}

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

A I 2 O_{3} . 2 S i O_{2} . 5 H_{2} O

N a_{2} O . A I_{2} O_{3} . 6 S i O_{2}

ANS : 2

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