${Ni}^{+4} \rightarrow {d}^{6}$ strong field ligand
$[image(1)]$
Pairing will be there zero unpaired electron
${NiCl}_{2} \rightarrow {Ni}^{2+} \rightarrow {d}^{8}$
$[image(2)]$
Change $=2$
$1.$ $[Co(NH_3)_5NO_2]Cl_2$ અને $[Co(NH_3)_5ONO]Cl_2$ $-$ બંધનીય
$2.$ $[Cu(NH_3)_4] [PtCl_4]$ અને $[Pt(NH_3)_4] [CuCl_4]$ $-$ સવર્ગ
$3.$ $[Pt(NH_3)_4Cl_2]Br_2$ અને $[Pt(NH_3)_4Br_2]Cl_2$ $-$ આયનીકારક
$1\, L \,of\, X + Excess\, of\, AgNO_3 \rightarrow Y\, mol\, of\, ppt.$
$1\, L\, of\, X + Excess\, of\, BaCl_2 \rightarrow Z\, mol\, of\, ppt.$
તો $Y$ અને $Z$ અનુક્રમે ............... થશે.