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प्रश्न
Out of Mn3+ and Cr3+, which is more paramagnetic and why ?
(Atomic nos. : Mn = 25, Cr = 24)
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उत्तर १
Mn3+ has four unpaired electrons (d4) in its valence shell whereas Cr3+ (d3) has three unpaired electrons. Thus, Mn3+ is more paramagnetic than Cr3+.
उत्तर २
Mn+3 = [Ar] 4s0 3d4 (4 unpaired e-)
Cr+3 = [Ar] 4s0 3d3 (3 unpaired e-)
Mn+3 has more no. of unpaired e- than Cr+3
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संबंधित प्रश्न
What may be the stable oxidation state of the transition element with the following d electron configurations in the ground state of its atom?
3d3
How is the variability in oxidation states of transition metals different from that of the non-transition metals? Illustrate with examples.
For M2+/M and M3+/M2+ systems, the EΘ values for some metals are as follows:
| Cr2+/Cr | −0.9 V |
| Mn2+/Mn | −1.2 V |
| Fe2+/Fe | −0.4 V |
| Cr3/Cr2+ | −0.4 V |
| Mn3+/Mn2+ | +1.5 V |
| Fe3+/Fe2+ | +0.8 V |
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Reason (R): Because it has positive electrode potential.
Among the following pairs of ions, the lower oxidation state in aqueous solution is more stable than the other in:-
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Transition metals and most of their compounds show paramagnetic behaviour.
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Zn, Cd, and Hg are soft metals.
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Ce4+ is a strong oxidising agent.
