Alloy or brass as a solid in solid solution

The same question, asked 2 times: 10 May 2023 S1, 16 Apr 2026 S2. Every wording below, oldest first.

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Question 1
10 May 2023 S1
57 $What type of solution is an alloy?$
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Question 2
16 Apr 2026 S2
25 $What type of solution is a brass ?$
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