For Examiners Use - For Examiner’s Use Question Mark TOTAL Tuesda...

*Jun25 7405101* IB/M/Jun25/G4007/V8 7405/1

For Examiner’s Use Question Mark 1 2 3 4 5 6 7 8 TOTAL

Tuesday 10 June 2025 Morning Time allowed: 2 hours

Materials

For this paper you must have:

• the Periodic Table/Data Booklet, provided as an insert (enclosed) • a ruler with millimetre measurements • a scientific calculator, which you are expected to use where appropriate.

Instructions • Use black ink or black ball-point pen.• Fill in the boxes at the top of this page.• Answer all questions.• You must answer the questions in the spaces provided. Do not write outside 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 this book. Write the question number against your answer(s).• All working must be shown.• Do all rough work in this book. Cross through any work you do not want to be marked.

Information • The marks for questions are shown in brackets.• The maximum mark for this paper is 105.

Please write clearly in block capitals.Centre number

Candidate number

Surname

Forename(s)

Candidate signature

I declare this is my own work.A-level

CHEMISTRY

Paper 1 Inorganic and Physical Chemistry 1 / 4

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*02*

IB/M/Jun25/7405/1

Do not write outside the box Answer all questions in the spaces provided.

• 1

This question is about some Group 2 elements and their compounds.

• 1

. 1 Magnesium is reacted with titanium(IV) chloride to extract titanium metal.

Give the equation for this reaction.

State the role of magnesium in this reaction.[2 marks]

Equation

Role of magnesium

• 1

. 2 Complete Table 1 by giving the formula of a suitable calcium compound for each use.[2 marks]

Table 1

Use Formula of calcium compound Decrease acidity of soil Remove SO 2 from flue gases in power stations

• 1

. 3 Magnesium hydroxide is used to relieve the symptoms of indigestion by neutralising stomach acid.

Suggest why magnesium hydroxide is safer than sodium hydroxide as a treatment for indigestion.[1 mark]

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*03* Turn over ►

IB/M/Jun25/7405/1

Do not write outside the box

An ionic compound of a Group 2 element dissolves in water to form solution X.

Separate samples of solution X are tested to identify the ions.

Table 2 shows the observations.

Table 2

Reagent added Observation Test 1 NaOH(aq) White precipitate Test 2 HNO3(aq) and AgNO3(aq) Cream precipitate

• 1

. 4 Identify the Group 2 cation in solution X.

Give an ionic equation for the reaction that occurs in Test 1.[2 marks]

Group 2 cation

Ionic equation

Question 1 continues on the next page

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4

*04* IB/M/Jun25/7405/1

Do not write outside the box

11

• 1

. 5 Identify the anion in solution X.

Give an ionic equation, including state symbols, for the reaction that occurs in Test 2.

Explain why AgNO3(aq) is acidified.[3 marks]

Anion

Ionic equation

Explanation

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. 6 Give one property of barium sulfate that makes it useful in hospitals.[1 mark]

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