Contents
Independent final check
Explain without the key
identify
Final check
Drops of four solutions, J, K, L and M, are put on universal indicator paper. J turns it green, K purple, L red and M yellow. Which row is correct?
identify: name or select.
| Row | Most acidic, highest concentration of H⁺ ions | Neutral | Most alkaline |
|---|---|---|---|
| A | M | J | K |
| B | L | J | K |
| C | L | M | K |
| D | K | J | L |
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Scope and sources
Cambridge IGCSE Chemistry 0620 · 2026–2028 v2 · Original learning materials.
The characteristic properties of acids and bases (7.1 Core 1 to 8; Supplement 9 to 12): indicator colours, acids and bases with metals, bases, carbonates and ammonium salts, H⁺ and OH⁻ ions, the pH scale and universal indicator, neutralisation, proton donors and acceptors, and strong and weak acids. Acidic, basic and amphoteric oxides are in the module Oxides, preparing salts in Making salts and titration in Titration.
Apparatus, amounts and times in the experiment are illustrative. Real practical work follows a teacher-approved safety method.
Official Cambridge syllabus