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Question:

Reagent S is: K4[Fe(CN)6], KOH, K2CrO4, Na2HPO4

Na2HPO4

KOH

K4[Fe(CN)6]

K2CrO4

Solution:

[NiCl4]2−TetrahedralHCl(Q)⇌excessNi2+(M1)KCN(R)→excess[Ni(CN)4]2−squareplanar[ZnCl4]2−TetrahedralHCl(Q)⇌excessZn2+(M2)KCN(R)→excess[Zn(OH)4]2−Tetrahedral↓KOH(S)Zn(OH)2Whiteppt.KOH→excess[Zn(OH)4]2−Soluble