Question 6 — Write the formulae of the - Questions at the end of the chapter - Chapter 9 - Atomic Foundations of Matter (Exploration)

Last updated at July 20, 2026 by

Question 6
Write the formulae of the compounds formed from the following pairs of ions. (i) Ca²⁺ and Br⁻ (ii) Al³⁺ and CO₃²⁻ (iii) K⁺ and SO₄²⁻ (iv) NH₄⁺ and Cl⁻
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  • (i) Ca²⁺ and Br⁻ → CaBr₂ .
  • (ii) Al³⁺ and CO₃²⁻ → Al₂(CO₃)₃ .
  • (iii) K⁺ and SO₄²⁻ → K₂SO₄ .
  • (iv) NH₄⁺ and Cl⁻ → NH₄Cl .
Formulae from Ion Pairs
CaBr2 Al2(CO3)3 K2SO4 NH4Cl
Back to: 9.5.2 Writing chemical formulae of ionic compounds
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