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Figure 3 shows a set-up used by a student to prepare dry chlorine gas in the laboratory.

Identify three mistakes in the set-up, and give a reason for each.

Answer Text:
- Wrong drying agent is used. Chlorine reacts with calcium oxide.
- Wrong method is used to collect chlorine. Chlorine is denser than air hence cannot be collected by upward delivery.
- Wrong reagents were used. Concentrated sulphuric (VI) acid does not produce chlorine with sodium chloride.