The wrong match is:

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(B) $1$. Mond's process is used for the purification of nickel,involving the formation of volatile nickel tetracarbonyl,$[Ni(CO)_4]$. This is correct.

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Estimation of $Ni^{+2} - EDTA$

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(B) $1$. Mond's process is used for the purification of nickel,involving the formation of volatile nickel tetracarbonyl,$[Ni(CO)_4]$. This is correct.$2$. $Ni^{+2}$ ions are estimated using $DMG$ (Dimethylglyoxime),not $EDTA$. $EDTA$ is typically used for the estimation of $Ca^{+2}$ and $Mg^{+2}$ ions in water hardness. Thus,this is the wrong match.$3$. The red pigment of blood is hemoglobin,which contains $Fe^{+2}$ as the central metal ion. This is correct.$4$. $Cis-[Pt(NH_3)_2Cl_2]$ (Cisplatin) is a well-known coordination compound used in cancer chemotherapy. This is correct.

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