Which of the following solutions is blue?
  1. .1 M Cu(NO3)2
  2. .1 M NaNO3
  3. .1 M CaCl2
  4. .1 M KNO3
  5. .1 M MgCl2
Explanation
Answer: .1 M Cu(NO3)2

Solutions containing copper have a blue coloration. In the context of the question, .1 M Cu(NO3)2 is blue.
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