Advertisements
Advertisements
प्रश्न
Why Zn, Cd and Hg are not called transition metals?
Account for the following:
Zn, Cd and Hg are not called transition elements.
उत्तर
The orbitals of elements such as Zn, Cd and Hg are totally occupied when they are in their ground state as well as their general oxidation state. As a result, these elements are not considered transition elements.
APPEARS IN
संबंधित प्रश्न
Which of the d-block elements may not be regarded as the transition elements?
How would you account for the following:
Of the d4 species, Cr2+ is strongly reducing while manganese (III) is strongly oxidising.
Why does the density of transition elements increase from Titanium to Copper? (at. no. Ti = 22,
Cu = 29)
Out of \[\ce{Cu2Cl2}\] and \[\ce{CuCl2}\], which is more stable and why?
The halides of transition elements become more covalent with increasing oxidation state of the metal. Why?
Match the catalysts given in Column I with the processes given in Column II.
Column I (Catalyst) | Column II (Process) |
(i) \[\ce{Ni}\] in the presence of hydrogen | (a) Zieglar Natta catalyst |
(ii) \[\ce{Cu2C12}\] | (b) Contact process |
(iii) \[\ce{V2O5}\] | (c) Vegetable oil to ghee |
(iv) Finely divided iron | (d) Sandmeyer reaction |
(v) \[\ce{TiCl4 + Al (CH3)3}\] | (e) Haber's Process |
(f) Decomposition of KCIO3 |
Which of the following is non-metallic?
If enthalpies of formation of C2H4(g), CO2(g) and H2O(l) at 25°C and 1 atm pressure are 52, – 394 and – 286 kJ/mol respectively, the change in ethalpy for combustion of C2H4 is equal to
Which of the following statements is not correct?
A complex in which dsp2 hybridisation takes place is