February/March 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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23Tests Ions GasesMedium1 mark
Mohr’s salt is a pale green crystalline solid which is soluble in water. It contains two cations, one of which is Fe, and one anion which is SO. The identity of the second cation was determined by heating Mohr’s salt with aqueous sodium hydroxide. A colourless gas was evolved which readily dissolved in water giving an alkaline solution. A green precipitate was also formed. What are the identities of the gas and the precipitate?
gasprecipitate
ANHFe(OH)
BNHNaSO
CSOFe(OH)
DSONaSO