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নিম্নের কোনটি টলেন বিকারক ?

[Z n (N H_{3})_{4}] (O H)_{2}

[A g (N H_{3})_{2}] N O_{3}

[C u (N H_{3})_{4}] S O_{4}

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

ANS : 2

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