An aqueous solution of NiCl₂ was heated  with excess sodium cyanide in presence of strong oxidizing agent to form ${\left[Ni{\left(CN\right)}_6\right]}^{2-}.$  The total change in number of unpaired electrons on metal centre is_________.

<p><span contenteditable="false"> <math> <mrow> <mi>N</mi> <mi>i</mi> <mi>C</mi> <msub> <mrow> <mi>l</mi> </mrow> <mrow> <mn>2</mn> </mrow> </msub> <mo>+</mo> <mi>N</mi> <mi>a</mi> <mi>C</mi> <mi>N</mi> <munderover> <mo>→</mo> <mrow> <mi>O</mi> <mo>.</mo> <mi>A</mi> <mo>.</mo> </mrow> <mrow> <mi>s</mi> <mi>t</mi> <mi>r</mi> <mi>o</mi> <mi>n</mi> <mi>g</mi> </mrow> </munderover> <msup> <mrow> <mrow> <mo> [</mo> <mrow> <mi>N</mi> <mi>i</mi> <msub> <mrow> <mrow> <mo> (</mo> <mrow> <mi>C</mi> <mi>N</mi> </mrow> <mo>)</mo> </mrow> </mrow> <mrow> <mn>6</mn> </mrow> </msub> </mrow> <mo>]</mo> </mrow> </mrow> <mrow> <mn>2</mn> <mo>−</mo> </mrow> </msup> </mrow> </math> </span></p><p>Complex has Ni⁴⁺ and strong ligand, hence following are the metal ion electronic configuration</p><p><img ></p><p>Change of unpaired electron = 2</p>

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