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प्रश्न
The second and third rows of transition elements resemble each other much more than they resemble the first row. Explain why?
उत्तर
Due to lanthanide contraction, the atomic radii of the second and third row transition elements are almost same. So, they resemble each other much more as compared to first row elements.
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संबंधित प्रश्न
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 |
Use this data to comment upon:
The stability of Fe3+ in acid solution as compared to that of Cr3+ or Mn3+.
What are inner transition elements?
Compare the general characteristics of the first series of the transition metals with those of the second and third series metals in the respective vertical columns. Give special emphasis on the following point:
Electronic configurations
Explain why transition metals and their compounds act as a catalyst.
Which of the following species has maximum magnetic momentum?
Which of the following transition metal is not coloured?
The oxidation state of Fe in [Fe(CO)5] is ______.
Which property of transition metals enables them to behave as catalysts?
Write the number of unpaired electrons in Cr3+.
(Atomic number of Cr = 24)
The second ionization enthalpies of chromium and manganese are 1592 and 1509 kJ/mol respectively. Explain the lower value of Mn.
