Example: biology

Mark scheme (A-level) : Paper 3 - June 2019

MARK SCHEME – A-LEVEL CHEMISTRY – 7405/3 – JUNE 2019 6 the Ag(NH 3) 2 + ion when the reagent should be Tollens’ reagent (or ammoniacal silver nitrate). In this example, no credit is given for the ion, but credit could be given for a correct observation following on from the use of the ion. Specific details will be given in mark schemes.

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  June, 2019, June 2019

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