When 1.0 mol dm³ Na₂S₂O₃(aq) is added to a solution containing Ag⁺(aq) ions, a linear complex, P, is formed. S₂O₃²⁻ ions are present in P as monodentate ligands. Define the term monodentate ligand.

1. (a)(i)When 1.0 mol dm³ Na₂S₂O₃(aq) is added to a solution containing Ag⁺(aq) ions, a linear complex, P, is formed. S₂O₃²⁻ ions are present in P as monodentate ligands. Define the term monodentate ligand.[2]
2. (a)(ii)Give the formula of P, including its charge.[1]
3. (b)(i)When 1.0moldm³ NaCN(aq) is added to a solution of P, a mixture which includes a second linear complex, Q, is formed. In this mixture the concentration of Q is much greater than the concentration of P. Write an equation for the reaction that occurs when NaCN(aq) is added to a solution of P.[1]
4. (b)(ii)Suggest a reason why the concentration of Q is much greater than the concentration of P in the mixture.[1]
5. (b)(iii)Name the type of reaction in which P forms Q.[1]
6. (c)(i)Platinum forms a complex ion with the formula [Pt(CN)₂Cl₂]²⁻. In this complex ion the carbon atom of each CN⁻ ligand bonds to the platinum ion. This complex shows stereoisomerism. There are only two isomers of this complex. Draw structures of these two isomers in the boxes below. Pt Pt[1]
7. (c)(ii)Describe the geometry of [Pt(CN)₂Cl₂]²⁻.[1]
8. (c)(iii)Name the type of stereoisomerism shown by [Pt(CN)₂Cl₂]²⁻.[1]

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