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Which of the following ions is colored in solution?

Practice Questions

Q1
Which of the following ions is colored in solution?
  1. Na+
  2. Ca2+
  3. Cu2+
  4. Mg2+

Questions & Step-by-Step Solutions

Which of the following ions is colored in solution?
Correct Answer: Cu2+
  • Step 1: Understand that some metal ions can produce color when dissolved in water.
  • Step 2: Identify that transition metal ions, like Cu2+, often have color due to their electronic structure.
  • Step 3: Learn about d-d transitions, which are movements of electrons between different energy levels in the d-orbitals of transition metals.
  • Step 4: Recognize that when light hits these ions, some wavelengths are absorbed, and the remaining light is what we see as color.
  • Step 5: Conclude that Cu2+ ions are colored in solution because they can undergo d-d transitions.
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