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Why Cu(l) is colourless and Cu(ll) is bl...

Why Cu(l) is colourless and Cu(ll) is blue in colour ?

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`Cu^+` has no unpaired d-electron. So, it is colourless. Whereas `Cu^(2+)` has one unpaired d-electron. Hence, it is blue in aqueous solution.
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OMEGA PUBLICATION-THE D- AND F-BLOCK ELEMENTS-MULTIPLE CHOICE QUESTIONS
  1. Why Cu(l) is colourless and Cu(ll) is blue in colour ?

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  2. Which element belongs to d-block elements ?

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  3. The transition elements have a general electronic configuration of

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  4. The correct ground state electronic configuration of chromium atom (Z...

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  5. Which of the following electronic configuration is that of a transiti...

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  6. Which of the following elements is alloyed with copper to form brass?

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  7. Copper can be extracted from

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  8. Argentite is an ore of

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  9. The process used for the extraction of gold is

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  10. Important ore of zinc is

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  11. The inner transition elements are the elements in which the added elec...

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  12. Transition elements

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  13. The tendency of the transition elements to form coloured compounds is...

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  14. Which of the following is diamagnetic ?

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  15. The common oxidation state of the elements of lanthanide series is

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  16. Which of the following is a lanthanide ?

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  17. For the process Cu(g) to Cu^+ (g) + e^- , the electron is to be...

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  18. Paramagnetism is a property of

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  19. The first ionisation energy of silicon is lower than that of

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  20. Which of the following electronic configurations will have the lowest...

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  21. In general, the melting and boiling point of transition metals

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