May/June 2026 Paper 43

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

6(a)Complex Ions Colour Ligand ExchangeEasy2 marks

Transition elements form complexes with species called ligands. The ethanedioate ion, C

_{2}

_{4}^{2 -}

, is a bidentate ligand.

Explain what is meant by bidentate ligand.

Answer

0 words

6(b)(i)Complex Ions Colour Ligand ExchangeMedium1 mark

One Fe

^{3 +}

ion forms an octahedral complex with three C

_{2}

_{4}^{2 -}

ions. State the formula and charge of this complex.

6(b)(ii)Complex Ions Colour Ligand ExchangeHard2 marks

This complex shows stereoisomerism. Draw three-dimensional diagrams to show all the stereoisomers of this complex.

The C

_{2}

_{4}^{2 -}

ion can be represented using the symbol shown.

a curved line joining two O atoms, the shorthand symbol used for the bidentate C$_{2}$O$_{4}^{2-}$ (ethanedioate) ligand in the diagrams to be drawn

Draw with the mouse or a finger.

6(b)(iii)Complex Ions Colour Ligand ExchangeMedium1 mark

State the type or types of stereoisomerism shown by this complex.

6(c)Complex Ions Colour Ligand ExchangeMedium2 marks

^{2 +}

ions and iodide ions, I

^{-}

, form a complex with the formula [HgI

_{4}

]

^{2 -}

. Write the expression for

K_{s t ab}

of [HgI

_{4}

]

^{2 -}

. State its units.

0 words

units