Please check the examination details below before entering your candidate information
Candidate surname Other names
Centre Number Candidate Number
Pearson Edexcel International Advanced Level
Monday 02 June 2025
Morning (Time: 1 hour 45 minutes) Paper
reference WCH15/01
Chemistry
International Advanced Level
UNIT 5: Transition Metals and Organic
Nitrogen Chemistry
You must have: Total Marks
Scientific calculator, Data Booklet, ruler
Instructions:
•• Use black ink or ball-point pen.
If pencil is used for diagrams/sketches/graphs it must be dark (HB or B).
• Fill in the boxes at the top of this page with your name,
centre number and candidate number.
•• Answer all questions.
Answer the questions in the spaces provided
– there may be more space than you need.
Information:
•• The total mark for this paper is 90.
The marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each question.
• Into the question marked with an asterisk (*), marks will be awarded for your ability
structure your answer logically, showing how the points that you make are
related or follow on from each other where appropriate.
• A Periodic Table is printed on the back cover of this paper.
Advice:
•• Read each question carefully before you start to answer it.
Show all your working in calculations and include units where appropriate.
•• Try to answer every question.
Check your answers if you have time at the end. Turn over
P78746A
©2025 Pearson Education Ltd.
Y:1/1/1/
*P78746A0132*
, SECTION A
Answer ALL the questions in this section.
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
You should aim to spend no more than 20 minutes on this section.
For each question, select one answer from A to D and put a cross in the box . If you change
your mind, put a line through the box and then mark your new answer with a cross .
1: Which reaction is thermodynamically feasible under standard conditions?
Use your Data Booklet.
A Ag + V3+ → Ag+ + V2+
B Cu+ + V3+ → Cu2+ + V2+
C Fe2+ + V3+ → Fe3+ + V2+
D Zn + 2V3+ → Zn2+ + 2V2+
(Total for Question 1 = 1 mark)
2: In a redox titration, 0.0500 mol dm−3 potassium manganate(VII) is titrated against
25.0 cm3 of a solution containing iron(II) ions.
MnO–4 + 8H+ + 5Fe2+ → 5Fe3+ + Mn2+ + 4H2O
The mean titre of potassium manganate(VII) is 18.95 cm3.
(a) What colour change is seen at the end-point?
(1)
A pale pink to pale green
B purple to pale pink
C pale green to pale pink
D pale pink to purple
2
*P78746A0232*
, (b) What is the concentration, in mol dm−3, of the Fe2+ ions in the solution?
(1)
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
A 1.90 × 10−1
B 7.58 × 10−3
C 4.74 × 10−3
D 1.90 × 10−4
(c) What is the percentage error in a single titre of 18.95 cm3?
(1)
[The uncertainty in a single burette reading is ±0.05 cm3]
A ± 0.20%
B ± 0.26%
C ± 0.40%
D ± 0.53%
(d) Which row shows the correct changes in oxidation states?
(1)
manganese iron
A II → VII III → II
B II → VII II → III
C VII → II III → II
D VII → II II → III
(Total for Question 2 = 4 marks)
Use this space for any rough working. Anything you write in this space will gain no credit.
3
*P78746A0332* Turn over
, 3: Which reaction occurs at an electrode in a hydrogen-oxygen fuel cell?
A O2(g) + 2H2(g) → 2H2O(l)
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
B O2(g) + 2H2O(l) + 4e− → 4OH−(aq)
C 4H+(aq) + 4OH−(aq) → 4H2O(l)
D H2O(l) + 2OH−(aq) → 2H2(g) + 1½O2(g) + 2e−
(Total for Question 3 = 1 mark)
4: What is the electronic configuration of a Zn2+ ion?
A [Ar] 3d10
B [Ar] 3d10 4s2
C [Ar] 3d9 4s1
D [Ar] 3d8 4s2
(Total for Question 4 = 1 mark)
5: What is the colour of an aqueous solution of V2+ ions?
A blue
B green
C purple
D yellow
(Total for Question 5 = 1 mark)
Use this space for any rough working. Anything you write in this space will gain no credit.
4
*P78746A0432*
Candidate surname Other names
Centre Number Candidate Number
Pearson Edexcel International Advanced Level
Monday 02 June 2025
Morning (Time: 1 hour 45 minutes) Paper
reference WCH15/01
Chemistry
International Advanced Level
UNIT 5: Transition Metals and Organic
Nitrogen Chemistry
You must have: Total Marks
Scientific calculator, Data Booklet, ruler
Instructions:
•• Use black ink or ball-point pen.
If pencil is used for diagrams/sketches/graphs it must be dark (HB or B).
• Fill in the boxes at the top of this page with your name,
centre number and candidate number.
•• Answer all questions.
Answer the questions in the spaces provided
– there may be more space than you need.
Information:
•• The total mark for this paper is 90.
The marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each question.
• Into the question marked with an asterisk (*), marks will be awarded for your ability
structure your answer logically, showing how the points that you make are
related or follow on from each other where appropriate.
• A Periodic Table is printed on the back cover of this paper.
Advice:
•• Read each question carefully before you start to answer it.
Show all your working in calculations and include units where appropriate.
•• Try to answer every question.
Check your answers if you have time at the end. Turn over
P78746A
©2025 Pearson Education Ltd.
Y:1/1/1/
*P78746A0132*
, SECTION A
Answer ALL the questions in this section.
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
You should aim to spend no more than 20 minutes on this section.
For each question, select one answer from A to D and put a cross in the box . If you change
your mind, put a line through the box and then mark your new answer with a cross .
1: Which reaction is thermodynamically feasible under standard conditions?
Use your Data Booklet.
A Ag + V3+ → Ag+ + V2+
B Cu+ + V3+ → Cu2+ + V2+
C Fe2+ + V3+ → Fe3+ + V2+
D Zn + 2V3+ → Zn2+ + 2V2+
(Total for Question 1 = 1 mark)
2: In a redox titration, 0.0500 mol dm−3 potassium manganate(VII) is titrated against
25.0 cm3 of a solution containing iron(II) ions.
MnO–4 + 8H+ + 5Fe2+ → 5Fe3+ + Mn2+ + 4H2O
The mean titre of potassium manganate(VII) is 18.95 cm3.
(a) What colour change is seen at the end-point?
(1)
A pale pink to pale green
B purple to pale pink
C pale green to pale pink
D pale pink to purple
2
*P78746A0232*
, (b) What is the concentration, in mol dm−3, of the Fe2+ ions in the solution?
(1)
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
A 1.90 × 10−1
B 7.58 × 10−3
C 4.74 × 10−3
D 1.90 × 10−4
(c) What is the percentage error in a single titre of 18.95 cm3?
(1)
[The uncertainty in a single burette reading is ±0.05 cm3]
A ± 0.20%
B ± 0.26%
C ± 0.40%
D ± 0.53%
(d) Which row shows the correct changes in oxidation states?
(1)
manganese iron
A II → VII III → II
B II → VII II → III
C VII → II III → II
D VII → II II → III
(Total for Question 2 = 4 marks)
Use this space for any rough working. Anything you write in this space will gain no credit.
3
*P78746A0332* Turn over
, 3: Which reaction occurs at an electrode in a hydrogen-oxygen fuel cell?
A O2(g) + 2H2(g) → 2H2O(l)
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
B O2(g) + 2H2O(l) + 4e− → 4OH−(aq)
C 4H+(aq) + 4OH−(aq) → 4H2O(l)
D H2O(l) + 2OH−(aq) → 2H2(g) + 1½O2(g) + 2e−
(Total for Question 3 = 1 mark)
4: What is the electronic configuration of a Zn2+ ion?
A [Ar] 3d10
B [Ar] 3d10 4s2
C [Ar] 3d9 4s1
D [Ar] 3d8 4s2
(Total for Question 4 = 1 mark)
5: What is the colour of an aqueous solution of V2+ ions?
A blue
B green
C purple
D yellow
(Total for Question 5 = 1 mark)
Use this space for any rough working. Anything you write in this space will gain no credit.
4
*P78746A0432*
