This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.

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Here are the answers to the questions based on the flow chart:
b) i) Solid A is Sulfur.
b) ii) One impurity removed by the purifier is dust (or arsenic compounds).
b) iii) It is necessary to remove impurities because they can poison the catalyst in the catalytic chamber, reducing its efficiency or making it inactive.
b) iv) Write chemical equations for the reactions which occur in one:
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b) i) Solid A is Sulfur. b) ii) One impurity removed by the purifier is dust (or arsenic compounds).
This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.