Consider the following test for a group-IV cation. ( aligned & M ²⁺+ H ₂ ~S A (Black precipitate) + by product & A + aqua regia B + NOCl + S + H ₂ O & B + KNO ₂+ CH ₃ COOH C + by product aligned ) The spin-only magnetic moment value of the metal complex ( C ) is ______ BM (Nearest integer)

Step-by-step solution

If (M⁺²=C o⁺² ) then ( aligned & Co ⁺²+ H ₂ ~S Black [A] CoS + byproduct & CoS + aqua regia [B] CoCl ₂ + NOCl + S + H ₂ O aligned ) ( CoCl ₂+ KNO ₂ CH ₃ COOH k₃ [ CO ( NO ₂ )₆ ]+ byproduct ) ([C]=C o⁺³ 3 d^6 N O₂ ) is SFL so Co +3 has zero unpaired (e⁻ ) ( n=0 u= n(n+2) =0 B . M )