Colour in transition metal complexes Quiz
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5 questions, one answer each
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1. Which statement is correct about the d orbitals in a transition metal complex?
- A. They split into groups of different energy because of repulsion from the ligands
- B. They all stay at the same energy in a complex
- C. They split only when the complex is coloured
- D. They merge into one orbital in an octahedral complex
2. An ion absorbs light of wavelength 400 nm. What is ΔE per ion? (h = 6.63 × 10⁻³⁴ J s, c = 3.00 × 10⁸ m s⁻¹)
- A. 4.97 × 10⁻²⁸ J
- B. 1.66 × 10⁻¹⁹ J
- C. 4.97 × 10⁻²⁶ J
- D. 4.97 × 10⁻¹⁹ J
3. Which ion is colourless in aqueous solution?
- A. Co²⁺
- B. Cu²⁺
- C. Zn²⁺
- D. Fe³⁺
4. A solution absorbs green light. What colour does it appear?
- A. Green
- B. Magenta/purple
- C. Blue only
- D. Colourless
5. Why does [CoCl₄]²⁻ differ in colour from [Co(H₂O)₆]²⁺?
- A. The cobalt oxidation number is different
- B. Cobalt has lost its d electrons
- C. The coordination number and ligand differ, so ΔE is different
- D. Chloride ions absorb all visible light