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प्रश्न
In 3d series (Sc to Zn), which element has the lowest enthalpy of atomisation and why?
उत्तर
In the 3d series, from Sc to Zn, only zinc has filled valence shells. The valence shell electronic configuration of Zn is 3d104s2. Due to the absence of unpaired electrons in ns and (n–1)d shells, the interatomic electronic bonding is the weakest in zinc. Consequently, zinc has the least enthalpy of atomisation in the 3d series of transition elements.
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संबंधित प्रश्न
How would you account for the following: Transition metals form complex compounds.
What are the characteristics of the transition elements and why are they called transition elements?
Comment on the statement that elements of the first transition series possess many properties different from those of heavier transition elements.
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) \[\ce{Ni}\]
Match List - I with List - II.
| List - I | List - II | ||
| (a) | \[\ce{[Fe(CN)6]^3-}\] | (i) | 5.92 BM |
| (b) | \[\ce{[Fe(H2O)6]^3+}\] | (ii) | 0 BM |
| (c) | \[\ce{[Fe(CN)6]^4-}\] | (iii) | 4.90 BM |
| (d) | \[\ce{[Fe(H2O)6]^2+}\] | (iv) | 1.73 BM |
Choose the correct answer from the options given below.
Give reasons for the following statement:
\[\ce{Zn}\], \[\ce{Cd}\] and \[\ce{Hg}\] are soft metals.
Account for the following:
Ce4+ is a strong oxidising agent.
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.
Account for the following:
Eu2+ with electronic configuration [Xe]4f76s2 is a strong reducing agent.
A coordination compound has the formula \[\ce{CoCl3.4NH3}\]. It precipitates silver ions as AgCl and its molar conductance corresponds to a total of two ions.
Based on this information, answer the following question:
- Deduce the structural formula of the complex compound.
- Write the IUPAC name of the complex compound.
- Draw the geometrical isomers of the complex compound.
