Identification of ions and gases — Difficult
Transfer your understanding to a changed context, justify decisions and check your reasoning. No hints during the test.
Includes extension practice
Several standard ion/gas tests are covered; Al³⁺, Cr³⁺, sulfite/SO₂ and calcium/barium flame tests extend the specified list.
Easy, Normal and Difficult describe practice demand; they are not the official Core and Extended tiers.
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