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
The listed standard tests overlap, but nitrate, sulfite/SO₂, Al³⁺, Cr³⁺ and extra flame colours extend the Combined Science list.
Easy, Normal and Difficult describe practice demand; they are not the official Core and Extended tiers.
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