AP EAMCET · Chemistry · d and f Block Elements
Which of the following is a correct statement?
- A Aqueous solutions of \(\mathrm{Cu}^{+}\)and \(\mathrm{Zn}^{2+}\) are colourless
- B Aqueous solutions of \(\mathrm{Cu}^{2+}\) and \(\mathrm{Zn}^{2+}\) are colourless
- C Aqueous solution of \(\mathrm{Fe}^{3+}\) is green in colour
- D Aqueous solution of \(\mathrm{MnO}_4^{-}\)is colourless
Answer & Solution
Correct Answer
(A) Aqueous solutions of \(\mathrm{Cu}^{+}\)and \(\mathrm{Zn}^{2+}\) are colourless
Step-by-step Solution
Detailed explanation
(a) \(\mathrm{Cu}^{+}=[\mathrm{Ar}] 3 d^{10}\) (No unpaired electrons, so it is colourless) \(\mathrm{Zn}^{2+}=[\mathrm{Ar}] 3 d^{10}\) (No unpaired electrons, so it is colourless) (b) \(\mathrm{Cu}^{2+}=[\mathrm{Ar}] 3 d^9\) (One unpaired electron is present, so it is coloured)…
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