An aqueous solution of \( \mathrm{NiCl}_{2} \) was heated with excess sodium cyanide in presence...

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An aqueous solution of \( \mathrm{NiCl}_{2} \) was heated with excess sodium cyanide in presence of strong oxidizing agent to from \( \left[\mathrm{Ni}(\mathrm{CN})_{6}\right]^{2-} \). The total change in number of unpaired electrons on metal centre is
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