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Aqueous Chemistry
2018 Paper One
Question Seven
9 marks available
1. Common errors:
giving chlorine as a product
incorrect balancing
incorrect formula for aluminium chloride.
2. Around 11% didn't attempt this question.
3. Some students stated that carbon dioxide was evolved, but this is not an observation – it is a deduction.
4. Just over 10% of students failed to attempt this part.
A white precipitate forms
effervescence
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