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Which of the following is a true solution?

1. Copper in gold
2. Sulphur in water
3. мilk
4. water in sulphur dioxide

Correct answer: Copper in gold

Solution

Copper in gold forms a solid solution (an alloy), where copper atoms are uniformly distributed in the gold lattice. The other options are not true solutions in the same sense: milk is a colloid, and the gas/liquid combinations listed do not fit a true solution here.

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