TS EAMCET · Chemistry · d and f Block Elements
Which of the following molecules is colourless?
- A \(\mathrm{CuSO}_4 \cdot 5 \mathrm{H}_2 \mathrm{O}\) (crystal)
- B \(\mathrm{CuSO}_4\) (anhydrous)
- C \(\left[\mathrm{Cu}\left(\mathrm{NH}_3\right)_4\right]^{2+}(\mathrm{aq})\)
- D \(\left[\mathrm{CuCl}_4\right]^{2-}(\mathrm{aq})\)
Answer & Solution
Correct Answer
(B) \(\mathrm{CuSO}_4\) (anhydrous)
Step-by-step Solution
Detailed explanation
Hydrated copper sulphate \(\mathrm{CuSO}_4 \cdot 5 \mathrm{H}_2 \mathrm{O}\) is blue in colour. The ligand (water) molecules causes splitting of \(d\)-orbitals. This facilitated \(d\) - \(d\) transition and colour. Anhydrous copper sulphate \(\mathrm{CuSO}_4\) is colourless. In…
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