MCQ
Which of the following statements is incorrect?
- ✓Mercurous ion exists as $Hg^+$
- BMercurous ion is diamagnetic and exists as dimer $Hg_2^{2+}$
- CMercurous ion is colourless
- DThere is a metallic bond between two $Hg^+$ ions
✓
Answer
Correct option: A.
Mercurous ion exists as $Hg^+$
a
For $Hg^+$, the electron configuration should be $5 d^{10}6 s^1$ with a spin free electron which would make the mercurous compound paramagnetic. However, mercurous compounds are diamagnetic which indicates the absence of any spin free electron [loss of two s electrons not one, to a configuration of dio (noble gas).
For $Hg^+$, the electron configuration should be $5 d^{10}6 s^1$ with a spin free electron which would make the mercurous compound paramagnetic. However, mercurous compounds are diamagnetic which indicates the absence of any spin free electron [loss of two s electrons not one, to a configuration of dio (noble gas).
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