(D) The chemical formula for ferric hexacyanoferrate $(II)$ is $Fe_4[Fe(CN)_6]_3$.When this compound dissociates in an aqueous solution,it produces $4

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(D) The chemical formula for ferric hexacyanoferrate $(II)$ is $Fe_4[Fe(CN)_6]_3$.When this compound dissociates in an aqueous solution,it produces $4$ ferric ions $(Fe^{3+})$ and $3$ hexacyanoferrate $(II)$ ions $([Fe(CN)_6]^{4-})$.Total number of ions $= 4 + 3 = 7$.