Ions and ionic bonds — Paper 2 · IGCSE Sciences - Co-ordinated (9-1) 0973

15 Which compound is formed when one metal atom transfers two electrons to one non-metal atom? A calcium chloride B calcium oxide C sodium chloride D sodium oxide

1 marks

Answer: B

This question in 0973/21 May/June 2020

15 What happens to rubidium atoms and to oxygen atoms when they form rubidium oxide, Rb2O? rubidium atoms oxygen atoms A gain one electron each lose one electron each B gain one electron each lose two electrons each C lose one electron each gain one electron each D lose one electron each gain two electrons each

1 marks

Answer: D

This question in 0973/22 May/June 2020

16 Which row explains why the melting points of covalent compounds are lower than those of ionic compounds? covalent compound ionic compound A strong attractive forces strong attraction between molecules between oppositely charged ions B strong attractive forces weak attraction between molecules between oppositely charged ions C weak attractive forces strong attraction between molecules between oppositely charged ions D weak attractive forces weak attraction between molecules between oppositely charged ions

1 marks

Answer: C

This question in 0973/21 May/June 2021

17 The charges on some ions are shown. positive ions negative ions Al 3+ N3– Li+ NO3 – Mg2+ O2– Zn2+ SO4 2– Which formula is correct? compound formula A aluminium sulfate Al 2(SO4)3 B lithium nitrate Li2NO3 C magnesium nitride Mg2N3 D zinc oxide ZnO2

1 marks

Answer: A

This question in 0973/21 May/June 2021

17 Phosphoric acid contains phosphate ions, PO4 3–. Phosphoric acid reacts with calcium hydroxide, Ca(OH)2, to form the salt calcium phosphate. What is the formula of calcium phosphate? A CaPO4 B Ca(PO4)3 C Ca2PO4 D Ca3(PO4)2

1 marks

Answer: D

This question in 0973/22 May/June 2021

16 Sodium phosphate, Na3PO4, contains sodium ions, Na+. Aluminium sulfate, Al 2(SO4)3, contains sulfate ions, SO4 2–. What is the formula of aluminium phosphate? A Al PO4 B Al (PO4)2 C Al 2(PO4)3 D Al 3(PO4)2

1 marks

Answer: A

This question in 0973/21 May/June 2022

16 Which statement describes the lattice structure of sodium chloride, NaCl ? A It is a random arrangement of equal numbers of sodium atoms and chlorine atoms. B It is a random arrangement of equal numbers of sodium ions and chloride ions. C It is a regular arrangement of alternating sodium atoms and chlorine atoms. D It is a regular arrangement of alternating sodium ions and chloride ions.

1 marks

Answer: D

This question in 0973/21 Oct/Nov 2022

17 The formula of an ammonium ion is NH4 +. The formula of a phosphate ion is PO4 3–. What is the formula of ammonium phosphate? A (NH4)3PO4 B (NH4)2PO4 C NH4PO4 D NH4(PO4)3

1 marks

Answer: A

This question in 0973/21 Oct/Nov 2024

16 The electronic configurations of four particles are shown. 1 2 3 4 Which diagrams represent the electronic configurations of a Group VI atom and its ion? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: B

This question in 0973/21 May/June 2025

17 An aluminium atom forms an aluminium ion, Al 3+. Which statement describes what happens to the aluminium atom? A It gains 3 electrons. B It gains 3 protons. C It loses 3 electrons. D It loses 3 protons.

1 marks

Answer: C

This question in 0973/21 May/June 2025

14 Which particle has the same number of electrons in its outer shell as an atom of sodium, 23 Na? 11 A 23 11Na + B 23 11Na  C 24 11Na D 24 12Na 2+

1 marks

Answer: C

This question in 0973/21 Oct/Nov 2025