May/June 2026 Paper 41

2026 · 9 questions · 63 parts · 100 marks

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1(a)1(b)1(c)1(d)(i)1(d)(ii)1(e)1(f)

–/14 mks

2(a)(i)2(a)(ii)2(b)(i)2(b)(ii)2(c)(i)2(c)(ii)2(c)(iii)2(d)

–/11 mks

3(a)3(b)3(c)(i)3(c)(ii)3(d)(i)3(d)(ii)

–/9 mks

4(a)4(b)4(c)4(d)4(e)

–/10 mks

5(a)5(b)5(c)5(d)5(e)(i)5(e)(ii)5(e)(iii)5(e)(iv)

–/13 mks

6(a)6(b)(i)6(b)(ii)6(b)(iii)6(c)

–/8 mks

7(a)(i)7(a)(ii)7(a)(iii)7(b)(i)7(b)(ii)7(b)(iii)7(b)(iv)7(b)(v)7(c)(i)7(c)(ii)

–/14 mks

8(a)(i)8(a)(ii)8(a)(iii)8(a)(iv)8(a)(v)8(a)(vi)8(b)(i)8(b)(ii)

–/10 mks

9(a)9(b)(i)9(b)(ii)9(c)(i)9(c)(ii)9(c)(iii)

–/11 mks

5(a)Transition Metals Their ReactionsEasy1 mark

Cobalt is a transition element. It forms a wide range of coloured compounds that contain Co

^{2 +}

ions or Co

^{3 +}

ions.

Explain why a transition element, such as cobalt, has variable oxidation states in its compounds.

Answer

0 words

5(b)Electron Configuration OrbitalsEasy1 mark

Complete the electronic configurations of a Co atom and a Co

^{2 +}

ion.

Co atom

^{2 +}

ion

5(c)Complex Ions Colour Ligand ExchangeHard3 marks

Explain why compounds containing Co

^{2 +}

ions are coloured.

Answer

0 words

5(d)Complex Ions Colour Ligand ExchangeMedium2 marks

A few drops of water are added to a piece of dry cobalt(II) chloride paper. Describe the colour change that is seen. Write an equation for the reaction that causes this colour change.

colour change

0 words

equation

0 words

5(e)(i)Transition Metals Their ReactionsMedium1 mark

Copper is a transition element. A piece of copper is added to HNO

_{3}

(aq). All the copper forms Cu(NO

_{3}

)

_{2}

(aq).

An excess of KI(aq) is added to the Cu(NO

_{3}

)

_{2}

(aq) in a conical flask. All the copper present forms CuI. The equation for the reaction is shown.

reaction 1 2Cu (N O_{3})_{2} + 4 I^{-} \to 2CuI + I_{2} + 4N O_{3}^{-}

The I

_{2}

formed in this reaction is titrated with 0.200 mol dm

^{- 3}

_{2}

_{2}

_{3}

(aq). The end-point of the titration is reached when 37.60 cm

^{3}

of Na

_{2}

_{2}

_{3}

(aq) has been added. The equation for the reaction is shown.

reaction 2 2 S_{2} O_{3}^{2 -} + I_{2} \to S_{4} O_{6}^{2 -} + 2 I^{-}

Describe two observations that can be made about the contents of the conical flask after KI(aq) has been added to Cu(NO

_{3}

)

_{2}

(aq).

Answer

0 words

5(e)(ii)Volumetric Techniques Titration PracticeEasy1 mark

Name a suitable indicator for this titration and describe the colour change at the end-point of the titration.

Answer

0 words

5(e)(iii)Oxidation Reduction Redox EquationsEasy1 mark

Name the type of reaction that occurs in both reactions 1 and 2.

5(e)(iv)Concentration Solutions Titration CalculationsHard3 marks

Calculate the mass, in g, of the piece of copper added to HNO

_{3}

(aq).

mass of copper