Bronze, an alloy of copper, is used to make ornaments some of which corrode when exposed to air for a long time. The table gives information about some of the compounds formed when bronze corrodes. (Ar: Cu 64, O 16, H 1, Cl 35.5, C 12)

1. aWrite the symbol for the other element in bronze. [1]
2. bComplete the table for R, Cu₂(OH)₃Cl: mass of 1 mole and percentage copper. [2]
3. cSuggest one substance in the air responsible for the corrosion of bronze. [1]
4. dDescribe a chemical test to show that compound Q contains carbonate ions. [2]

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