Short Answer TypeGive Possible reason for the fact that the radii of Mn2+ ions of the first row transition metals. Ti2+ (Z = 22) to Cu2+ (Z = 29) decrease with increasing atomic number.
Explain the catalytic action of Fe(III) between the reaction of I– and persulphate ion S2O82–.
What can be inferred from the magnetic moment values of the following complex species?
|
Example |
Magnetic Moment (BM) |
|
K4[Mn(CN)6] |
2.2 |
|
[Fe(H2O)6]2+ |
5.3 |
|
K3 [Mn Cl4] |
5.9 |
In the crystal lattices of transition metals-small atoms like C, H, B, N etc. are trapped non-stoichiometrically. Such compounds are called interstitial compounds, e.g., TiC, Mn4N, Fe3H, TiH2 etc. Their main characteristics are:
(i) They have high melting points than their metals.
(ii) They become much harder (e.g., borides).
(iii) Metallic conductivity is retained.
(iv) They become chemically inert.
(v) They become less malleable and ductile.
Long Answer TypeShort Answer TypeWhy are transition metal fluorides ionic in nature, whereas bromides and chlorides are covalent in nature.
Why are the ionization enthalpies of 5d elements greater than those of 3d and 4d elements?
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