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Question

সিরামিক শিল্পের গুরুত্বপূর্ণ কাঁচামাল , ক্যাওলিনাইটের রাসায়নিক সংকেত হলো -

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

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

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

K_{2} O . A l_{2} O_{3} . 6 S i O_{2}

ANS : 1

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