Which of the following compounds after mixing | vedclass

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(D) $1$. $K_4[Fe(CN)_6] + FeCl_3$ produces Prussian blue precipitate of $Fe_4[Fe(CN)_6]_3$.$2$. $NH_4OH$ added to $CuSO_4$ produces a deep blue comple

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Excess $KCN$ and $CuSO_4$ solution

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(D) $1$. $K_4[Fe(CN)_6] + FeCl_3$ produces Prussian blue precipitate of $Fe_4[Fe(CN)_6]_3$.$2$. $NH_4OH$ added to $CuSO_4$ produces a deep blue complex $[Cu(NH_3)_4]SO_4$.$3$. Anhydrous $CuSO_4$ is white,but it turns blue upon hydration to form $CuSO_4 \cdot 5H_2O$.$4$. Excess $KCN$ added to $CuSO_4$ forms a colorless complex $[Cu(CN)_4]^{3-}$ because $Cu^{2+}$ is reduced to $Cu^+$ by $CN^-$,and the resulting complex is colorless. Thus,it does not produce a blue color.

Which of the following compounds after mixing cannot produce blue coloration?

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