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জিপসাম এর সংকেত কোনটি?

M g_{3} C a (S i O_{3})_{4}

C a C O_{3} M g C O_{3}

C a_{3} (P O_{4})_{2} 2 H_{2} O

C a S o_{4} . 2 H_{2} O

ANS : 4

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