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A-level
CHEMISTRY
Paper 1 Inorganic and Physical Chemistry
2023 AQA A-level CHEMISTRY 7405/1 Paper 1 Inorganic and Physical Chemistry Question
Paper & Mark scheme (Merged) June 2023 [VERIFIED]
Monday 12 June 2023 Morning Time allowed: 2 hours
Materials
For this paper you must have: For Examiner’s Use
• the Periodic Table/Data Booklet, provided as an insert (enclosed)
• a ruler with millimetre measurements Question Mark
• a scientific calculator, which you are expected to use where appropriate. 1
2
Instructions
• Use black ink or black ball-point pen. 3
• Fill in the boxes at the top of this page. 4
• Answer all questions. 5
• You must answer the questions in the spaces provided. Do not write outside
6
the box around each page or on blank pages.
• If you need extra space for your answer(s), use the lined pages at the end of 7
this book. Write the question number against your answer(s). 8
• All working must be shown.
9
• Do all rough work in this book. Cross through any work you do not
10
want to be marked.
TOTAL
Information
• The marks for questions are shown in brackets.
• The maximum mark for this paper is 105.
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1This question is about complexes of the transition metal chromium.
0 1. 1 State the meaning of the term transition metal complex.
[1 mark]
Cr(PF3)6 is a complex of chromium that contains molecules of PF3
0 1 . 2The electron pair repulsion theory can be used to predict the shape of a PF3 molecule.
Draw the shape of a PF3 molecule.
Include any lone pairs of electrons that influence the shape.
Name the shape.
[2 marks]
Shape
Name of shape
0 1 . 3Suggest why the oxidation state of chromium is zero in Cr(PF3)6
[1 mark]
*02*
IB/M/Jun23/7405/1
, 3
Do not write
outside the
The compound [Cr(NH3)4Cl2]Cl contains ammonia molecules. box
0 1 . 4Deduce the oxidation state of chromium in [Cr(NH3)4Cl2]Cl
[1 mark]
0 1 . 5Name the type of bond between N and H in ammonia.
[1 mark]
0 1 . 6 The compound [Cr(NH3)4Cl2]Cl contains a complex ion that shows isomerism.
Draw the two isomers of the complex ion.
State the type of isomerism shown.
[3 marks]
Isomer 1 Isomer 2
Type of isomerism
0 1 . 7 Complete the equation to show the formation of one complex that contains chromium
in its +3 oxidation state.
[1 mark]
CrCl3 + 5 H2O → 10
Turn over ►
*03*
IB/M/Jun23/7405/1
, 4
Do not write
outside the
0 2Figure 1 shows a cell used to measure the standard electrode potential for the half- box
cell → Mg(s)Mg2+(aq)+2e–
Figure 1
0 2 . 1 State the purpose of the salt bridge.
Identify an ionic compound that could be used in the salt bridge.
[2 marks]
Purpose
Identity
0 2 . 2 State how, if at all, the EMF of this cell will change if the surface area of the
platinum electrode is increased.
[1 mark]
*04*
IB/M/Jun23/7405/1
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