Which of the following is/are true solution/s?
NaCl in Sulphur Dioxide
Copper in Silver
Salt in petrol
Mud in water

Dear student,
Please find below the solution to the asked query:
Alloys form true solutions.
So Copper in Silver is a true solution.

NaCl with sulphur dioxide forms sodium sulphate which is a precipitate.
Mud in water is a suspension.
Salt in petrol is a suspension.

Hence Copper in Silver is the correct answer.

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