February/March 2026 Paper 22

2026 · 40 questions · 40 parts · 40 marks

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40Tests Ions GasesMedium1 mark
The results of some tests on dilute aqueous solution X are shown.
testobservation
add aqueous ammonia dropwisewhite precipitate
then add aqueous ammonia in excessprecipitate dissolves to form colourless solution
add aqueous sodium hydroxide dropwisewhite precipitate
then add aqueous sodium hydroxide in excessprecipitate dissolves to form colourless solution
Which cation is present in X?