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.
Explain giving reason:
Zn, Cd and Hg are not regarded as transition elements.
Why are Zn, Cd and Hg not regarded as transition elements?
Advertisements
उत्तर १
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.
उत्तर २
- Zn, Cd, and Hg have completely filled d-orbitals in their atoms and common ions (Zn2+, Cd2+, Hg2+).
- Their electronic configurations show no partly filled d-orbitals.
- Transition elements are defined as d-block elements having partly filled d-orbitals in their atoms or common ions.
- Since Zn, Cd, and Hg lack partly filled d-orbitals, they do not meet the definition of transition elements.
- Hence, Zn, Cd, and Hg are not regarded as transition elements.
Notes
Students can refer to the provided solutions based on their preferred marks.
APPEARS IN
संबंधित प्रश्न
Complete the following chemical equations:
`(i) Cr_2O_7^(2-)+6Fe^(2+)+14H^+ ->`
`(ii) 2CrO_4^(2-)+2H^+ ->`
`(iii) 2MnO_4^-+5C_2O_4^(2-)+16H^+ ->`
What can be inferred from the magnetic moment value of the following complex species?
| Example | Magnetic Moment (BM) |
| K2[MnCl4] | 5.9 |
Write balanced chemical equations for the conversion of `CrO_4^(2-)` to `Cr_2O_7^(2-)` in acidic medium and `Cr_2O_7^(2-)` to `CrO_4^(2-)`
in basic medium.
Which among the following transition metal has the lowest melting point?
A solution of \[\ce{KMnO4}\] on reduction yields either a colourless solution or a brown precipitate or a green solution depending on pH of the solution. What different stages of the reduction do these represent and how are they carried out?
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?
Passing H2S gas into a mixture of Mn2+ and Ni2+, Cu2+, ions in an acidified aqueous solution precipitates.
Match List - I with List - II.
| List - I | List - II | ||
| (A) | [Fe(CN)6]3− | (i) | 5.92 BM |
| (B) | [Fe(H2O)6]3+ | (ii) | 0 BM |
| (C) | [Fe(CN)6]4− | (iii) | 4.90 BM |
| (D) | [Fe(H2O)6]2+ | (iv) | 1.73 BM |
Choose the correct answer from the options given below.
Consider the following standard electrode potential values:
\[\ce{Fe^{3+}_{ (aq)} + e^- -> Fe^{2+}_{ (aq)}}\], E0 = +0.77 V
\[\ce{MnO^{-4}_{ (aq)} + 8H^+ + 5e^- -> Mn^{2+}_{ (aq)} + 4H2O_{(l)}}\], E0 = +1.51 V
What is the cell potential for the redox reaction?
The compounds of \[\ce{Ti^4+}\] ions are colourless due to ______.
