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Question

নিম্নের কোনটি প্লাষ্টার অব গ্যারিসের সঠিক সংকেত ?

$M g S O_{4} 7 H_{2} O$

$Z n S O_{4} 2 H_{2} O$

$C a S O_{4} 2 H_{2} O$

$C a S O_{4} \frac{1}{2} H_{2} O$

ANS : 3

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