A-LevelChemistryGroup 29701/12 · Oct/Nov 2023 · Q221 Mark
The table gives some data for compounds of two elements from Group 2 of the Periodic Table. Element calcium has decomposition temperature of carbonate/°C 840, solubility of sulfate in mol/100 g of water 4.66 × 10⁻³, solubility of hydroxide in mol/100 g of water 1.53 × 10⁻³. Element Z has solubility of hydroxide in mol/100 g of water 2.00 × 10⁻⁵. What is the missing data for element Z (decomposition temperature of carbonate/°C and solubility of sulfate in mol/100 g of water)?
A350, 1.83 × 10⁻¹
B350, 7.11 × 10⁻⁵
C1100, 1.83 × 10⁻¹
D1100, 7.11 × 10⁻⁵
✓ Correct answer
A: 350, 1.83 × 10⁻¹
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