Lesson 15A.3
15A.3 Colour of transition metal ions Quiz: Pearson Edexcel Chemistry, Unit 15
20 questions
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Lesson 15A.3, Colour of transition metal ions: 20 multiple choice questions for the Pearson Edexcel Chemistry (9CH0), Unit 15: Transition Metals, written with Revision Ninja.
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The 20 questions
-
What type of electronic transition causes the colour of transition metal complexes?
- d-d transition
- p-d transition
- d-s transition
- s-p transition
-
Why are zinc(II) ions colourless in aqueous solution?
- Empty 4s subshell
- Empty 3d subshell
- Full 4s subshell
- Full 3d subshell
-
Why are scandium(III) ions colourless in aqueous solution?
- Full 4s subshell
- Full 3d subshell
- Partially filled 3d
- Empty 3d subshell
-
What property of split d orbitals changes when a transition metal's oxidation state changes?
- Mass number
- Total orbital capacity
- Principal quantum number
- Energy gap
-
Why does replacing one ligand with another change the colour of a complex ion?
- Changes atomic number
- Alters nucleus size
- Alters d-orbital splitting
- Removes all electrons
-
Which factor changes with coordination number, altering the colour of a complex?
- Geometry and splitting
- Ligand mass only
- Oxidation state only
- Electronegativity
-
Which factor determines the energy of light absorbed in a d-d transition?
- Ligand mass
- d orbital splitting
- Electronegativity
- Nuclear spin
-
Which aqueous ion is pale green?
- Zn2+(aq)
- Mn2+(aq)
- Cu2+(aq)
- Fe2+(aq)
-
What colour is aqueous copper(II) ion, [Cu(H2O)6]2+?
- Blue
- Colourless
- Green
- Yellow
-
What colour is aqueous chromium(III) ion?
- Violet
- Colourless
- Orange
- Yellow
-
What colour is the aqueous vanadium(II) ion, V2+?
- Violet
- Yellow (V5+)
- Blue (V4+)
- Green (V3+)
-
What colour is aqueous cobalt(II) ion?
- Colourless
- Pink
- Yellow
- Blue
-
What colour is the complex [Cu(NH3)4(H2O)2]2+ formed from aqueous copper(II) by adding excess ammonia?
- Yellow
- Deep blue
- Pale green
- Colourless
-
Why is the titanium ion in TiO2 colourless?
- Empty d subshell
- High charge density
- Strong ligand field
- Full d subshell
-
Which of these complex ions is colourless?
- [Fe(H2O)6]3 launch
- [Co(H2O)6]2+
- [Cu(NH3)4(H2O)2]2+
- [Zn(NH3)4]2 launch
-
Why is Sc3+ colourless in aqueous solution?
- Empty d subshell
- Small ionic radius
- Full d subshell
- High oxidation state
-
Which complex shape is formed when [Co(H2O)6]2+ reacts with excess chloride ions?
- Octahedral
- Linear
- Square planar
- Tetrahedral
-
What region of the electromagnetic spectrum matches the d orbital energy gap in many transition complexes?
- Microwave
- Ultraviolet
- Infrared
- Visible light
-
Why do V2+ and V3+ ions show different colours in solution?
- Different ligand mass
- Different d electron count
- Nuclear decay rate
- Different atomic mass
-
Why are copper(II) ions coloured while zinc ions are colourless?
- No electrons in d orbitals
- Full d subshell
- Incomplete d subshell
- Absence of ligands
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