3
(1)
(iv) Deduce the values of x and y in the formula of the complex ion [Cu(NH ) (H O) ]2+.
Question
Mathematics
Edexcel2021
*P65463A0728*
Turn over
PPMMTT
(c) A sodium atom has 11 protons whereas a potassium atom has 19 protons.
Explain why the first ionisation energy of sodium is greater than that of potassium.
(3)
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Question
Mathematics
Edexcel2021
This question is about acids and buffer solutions.
(a) Ethanoic acid, CH COOH, is a monobasic acid.
Question
Mathematics
Edexcel2021
Transition metals form complex ions.
(a) Complex ions have a central metal ion surrounded by ligands.
(i) Give a reason why the ammonium ion cannot act as a ligand.
(1)
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(ii) Explain why the complex ions [Co(NH ) ]2+ and [Co(H O) ]2+ are coloured and
Question
Mathematics
Edexcel2021
*P65463A02128*
Turn over
PPMMTT
(c) Compare and contrast the complex ions formed by cobalt(III) ions with the ligand
ethane-1,2-diamine and with the ligand EDTA4–.
Ignore any difference in colour.
O
–O O
O–
N
N
–O
O O–
NH
Question
Mathematics
Edexcel2021
2
of different complex ions containing both chloride and water ligands.
The general formula of these complex ions is [Cr(H O) (Cl) ](3–y)+
Question
Chemistry
CAIE2021
Copper is a transition metal.
(a) State two general properties of transition metals that are not shown by the s-block metals in Period 4.
(b) Write the electronic configuration of Cu²⁺.
(c) Explain why transition metal compounds are often coloured.
[7 marks]
Mathematics
Edexcel2018
This question is about transition metals.
(a) Which of these ions has the electronic configuration [Ar]3d5?
(1)
A Cr3+
B Fe2+
C Mn2+
D Mn3+
(b) In which of these complex ions does the transition metal have the
oxidation number +3?
(1)
A [Ag(CN) ]−
Question
Mathematics
Edexcel2018
2
(1)
A all complex ions having a metal ion with a +1 charge are colourless
B no electronic transitions can take place between d-orbitals
C the d-orbitals cannot split in energy
D there are no electrons in the d-subshell