M5S13 – Complex Ions

Complex Ions

1 / 10

Which types of chemical bonding feature in crystals of the compound K₂[Ni(CN)₄]?

(i) ionic bonding

(ii) covalent bonding

(iii) dative covalent bonding

(iv) metallic bonding

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

2 / 10

Which of these complex ions acts as an acid in aqueous solution?

(i) [Ni(NH₃)₆]²⁺

(ii) [Al(H₂O)₂(OH)₄]^-

(iii) [Ag(NH₃)₂]⁺

(iv) [Cr(H₂O)₆]3⁺

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

3 / 10

Which of the following can act as a bidentate ligand in the formation of complexes with metal ions?

(i) S₂O₃^2-

(ii) C₂O₄^2-

(iii) SCN^-

(iv) H₂NCH₂CH₂NH₂

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

4 / 10

When four bromide ions combine with a cobalt(II) ion

(i) the charge on the complex ion is 2-

(ii) the shape of the complex ion is tetrahedral

(iii) the coordination number of the cobalt atom is 4

(iv) the name of the complex is the tetrabromocobalt (II) ion

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

5 / 10

The compound with the formula K₃[Fe(CN)₆]

(i) is potassium hexacyanoferrate(III)

(ii) contains a complex with an octahedral shape

(iii) includes iron in the oxidation state +3

(iv) contains an hexadentate ligand

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

6 / 10

Which of these complex ions have a colour in solution?

(i) [Sc(H₂O)₃]²⁺

(ii) [CuCl₂]^-

(iii) [Zn(OH)₄]^2-

(iv) [Co(H₂O)₆]²⁺

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

7 / 10

In which of these complexes is the oxidation state of the metal +3?

(i) [Fe(H₂O)₅SCN]²⁺

(ii) [CoCl₄]^2-

(iii) [Cr(H₂O)₄Cl₂]⁺

(iv) [Ag(S₂O₃)₂]^2-

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

8 / 10

Which of the statements below are true of this reaction?

[Cu(H₂O)₆]²⁺(aq) + 4NH₃(aq) <=> [Cu(NH₃)₄(H₂O)₂]²⁺(aq) + 4H₂O(aq)

(i) Copper disproportionates,

(ii) It is a proton transfer reaction,

(iii) Ammonia is oxidised,

(iv) It is a ligand exchange reaction

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

9 / 10

In an EDTA complex with a copper(II) ion

(i) there are six ligand molecules,

(ii) there are four dative bonds between oxygen atoms and the metal ion,

(iii) the overall charge on the complex ion is zero,

(iv) there are two dative bonds between nitrogen atoms and the metal ion

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

10 / 10

In the anti-cancer complex compound [Pt(NH₃)₂Cl₂]

(i) the Pt, N and Cl atoms lie in one plane

(ii) the N-Pt-N angle is 180^o

(iii) the Cl-Pt-Cl angle is 90^o

(iv) the coordination number of platinum is zero

(i), (ii) and (iii)

(i) and (iii) only

(ii) and (iv) only

(iv) alone

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