CH-1615
Tests for cations
Chemistry · Secondary 4 · Medium · Tests for cations
A student heats a solid mixture in a test-tube and notices a colourless gas that turns damp red litmus paper blue. Later, when aqueous sodium hydroxide is added to a solution of the solid and warmed, the same gas is produced again. Which cation is present in the solid?
- ammonium, NH₄⁺
- calcium, Ca²⁺
- copper(II), Cu²⁺
- iron(III), Fe³⁺
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