KCET · Chemistry · d and f Block Elements
Which of the following does not represent property stated against it?
- A \(\mathrm{CO}^{2+} < \mathrm{Fe}^{2+} < \mathrm{Mn}^{2+}\) - Ionic size
- B \(\mathrm{Ti} < \mathrm{V} < \mathrm{Mn}-\) Number of oxidation states
- C \(\mathrm{Cr}^{2+} < \mathrm{Mn}^{2+} < \mathrm{Fe}^{2+}\) - Paramagnetic behaviour
- D \(\mathrm{Sc}>\mathrm{Cr}>\mathrm{Fe}\) - Density
Answer & Solution
Correct Answer
(C) \(\mathrm{Cr}^{2+} < \mathrm{Mn}^{2+} < \mathrm{Fe}^{2+}\) - Paramagnetic behaviour
Step-by-step Solution
Detailed explanation
The property stated against option (c) is incorrect.
The electronic configuration of given elements (ions) are
It is clear from above electronic configuration that \(\mathrm{Mn}^{2+}\) has maximum number of unpaired electrons (5).
\(\therefore\) It shown maximum paramagnetic behaviours among the given ions.
The electronic configuration of given elements (ions) are
It is clear from above electronic configuration that \(\mathrm{Mn}^{2+}\) has maximum number of unpaired electrons (5).
\(\therefore\) It shown maximum paramagnetic behaviours among the given ions.
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