Much of the world supply of planinam gro...

Much of the world supply of planinam group metal Le, desived from the residues recovered from the electrolytic retining of copper and nickyl. The residues when heated with aquaria the sold, and pd go in to solution. This is filtered off and to the filiate on adding Ferrous sphate solution gold is preciated the platinum and palladium remain in solution.
The solubility of the gold platinum and palladium in aquaregia is due to the formation of

`AuCl, PtCl_(2), PdCl_(2)`

`AuCl_(3),PtCl_(4),PdCl_(4)`

`HAuCl_(4), H_(2)PtCl_(6),H_(2)PdCl_(4)`

`HAuCl_(4),H_(2)PtCl_(4),H_(2)PdCl_(4)`

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The correct Answer is:

AU, Pt & Pd are dissolved in aquaregia due to formation of `AuCl_(4)^(-)-[PtCl_(6)]^(-2)[PdCl_(4)]^(-2)`

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Much of the world supply of planinam group metal Le, desived from the residues recovered from the electrolytic retining of copper and nickyl. The residues when heated with aquaria the sold, and pd go in to solution. This is filtered off and to the filiate on adding Ferrous sphate solution gold is preciated the platinum and palladium remain in solution. The role of Ferrous sulphate in the recipitation of gold is

Oxidation

Reductant

Complex agent

Substituent

Square planar and square planar

Square planar and Tetrahedral

Tetrahedral and Square planar

Octahedral and Square planar

No change in colour

Becomes colourless

Turns to red

Turns to green