Chemistry · General trends in properties of the first-row transition elements: physical properties, ionization enthalpy, oxidation states, atomic radii, colour, catalytic behaviour, magnetic properties, complex formation, interstitial compounds, alloy formation
Generally transition elements for coloured salts due to the presence of unpaired
Generally transition elements for coloured salts due to the presence of unpaired electrons. Which of the following compound will be coloured in solid state?
- A. \( A g_{2} S O_{4} \)
- B. \( C u F_{2} \)
- C. \( C u_{2} C l_{2} \)
- D. \( Z n F_{2} \)
Step-by-step solution
CuF2 contains Cu2+ with d9 configuration, which has one unpaired electron. This allows d-d transitions, giving colour to the solid. Ag2SO4 and Cu2Cl2 contain d10 ions (Ag+ and Cu+ respectively) with no unpaired electrons, so they are colourless. ZnF2 contains Zn2+ with d10 configuration, also colourless.
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