CH-1607
Tests for cations
Chemistry · Secondary 4 · Easy · Tests for cations
A student adds aqueous sodium hydroxide to an unknown solution and warms it gently. A colourless gas is produced that turns damp red litmus paper blue.
Which ion is present in the unknown solution?
Which ion is present in the unknown solution?
- Cu²⁺
- NH₄⁺
- Fe²⁺
- Zn²⁺
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