CH-1630
Tests for anions
Chemistry · Secondary 4 · Easy · Tests for anions
A student adds aqueous sodium hydroxide and a small piece of aluminium foil to a solution, then warms the mixture. A colourless gas is produced that turns damp red litmus paper blue. Which anion is present in the solution?
- carbonate, CO₃²⁻
- sulfate, SO₄²⁻
- nitrate, NO₃⁻
- chloride, Cl⁻
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