Qa Test Marking Scheme
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Sec 3 Express: QA Analysis MARKING SCHEME Section A: Q1 Q2 Q3 Q4 Q5
C C D B C
Section B: Q1
Q2
Q3
P - copper (II) nitrate Q- Copper (II) hydroxide R- Ammonia S – Sulfuric acid T – Copper (II) sulfate V – Barium Sulfate (i) Chloride ion (ii) The acid is added to react with and remove other substances which might also produce precipitates with silver nitrate solution. Mainly carbonates Add potassium dichromate (VI). Green orange
[6m]
[1m] [2m] [2m]
C C D B C
Section B: Q1
Q2
Q3
P - copper (II) nitrate Q- Copper (II) hydroxide R- Ammonia S – Sulfuric acid T – Copper (II) sulfate V – Barium Sulfate (i) Chloride ion (ii) The acid is added to react with and remove other substances which might also produce precipitates with silver nitrate solution. Mainly carbonates Add potassium dichromate (VI). Green orange
[6m]
[1m] [2m] [2m]
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