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प्रश्न
The paramagnetic character in-3d-transition series elements increases-: up to Mn and then decreases.
उत्तर
Paramagnetic character increases with the increase in the number of unpaired electrons. The larger is the number of unpaired e– in central atom or ion greater is the paramagnetic character
Hence from Sc to Mn number of unpaired e– increases and then from Fe to Zn decreases. Hence paramagnetic character also increases from Sc to Mn and then decreases from Fe to Zn.
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संबंधित प्रश्न
The elements of 3d transition series are given as: Sc Ti V Cr Mn Fe Co
Answer the following: Which element shows only +3 oxidation state?
How would you account for the following : Transition metals form coloured compounds
How would you account for the following?
Zr (Z = 40) and Hf (Z = 72) have almost identical radii.
Give reasons: E° value for the Mn3+/Mn2+ couple is much more positive than that for Fe3+/Fe2+.
Transition elements form binary compounds with halogens. Which of the following elements will form \[\ce{MF3}\] type compounds?
(i) \[\ce{Cr}\]
(ii) \[\ce{Co}\]
(iii) \[\ce{Cu}\]
(iv) \[\ce{Ni}\]
Transition metals can act as catalysts because these can change their oxidation state. How does \[\ce{Fe(III)}\] catalyse the reaction between iodide and persulphate ions?
Which does not belong to first transition series?
The given graph shows the trends in melting points of transition metals:
Explain the reason why Cr has the highest melting point and manganese (Mn) has a lower melting point.
Write the number of unpaired electrons in Cr3+.
(Atomic number of Cr = 24)
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:
Atomic sizes
