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নিচের কোনটি দ্বিলবণ বা যুগ্ম লবণ?

F e S O_{4} . (N H_{4})_{2} S O_{4} . 6 H_{2} O \to M o h r' s s a l t,

C u C O_{3 .} C u (O H)_{2}

N a_{2} H P O_{4}

K_{4} [F e (C N)_{6}]

ANS : 1

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