Advertisements
Advertisements
प्रश्न
What are inner transition elements?
Advertisements
उत्तर
Lanthanoids and actinoids are called inner transition elements because inner f-orbitals are progressively filled and the last electron goes to the anti-penultimate f-orbital.
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^+ ->`
Give reasons:
Transition metals show variable oxidation states.
Which is a stronger reducing agent, Cr2+ or Fe2+ and why?
Why are Mn2+ compounds more stable than Fe2+ towards oxidation to their +3 state?
How is the variability in oxidation states of transition metals different from that of the non-transition metals? Illustrate with examples.
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 is the most stable oxidation state of iron?
Why EΘ values for Mn, Ni and Zn are more negative than expected?
Ionisation enthalpies of Ce, Pr and Nd are higher than Th, Pa and U. Why?
Mention any three processes where transition metals act as catalysts.
On the basis of the figure given below, answer the following questions:
- Why Manganese has lower melting point than Chromium?
- Why do transition metals of 3d series have lower melting points as compared to 4d series?
- In the third transition series, identify and name the metal with the highest melting point.
Photographic film and plates have - au essential ingredient of
Which of the following transition metal is not coloured?
Why are all copper halides known except that copper iodide?
The value of Δ0 for \[\ce{RhCl^{3-}6}\] is 243 KJ/mol which wavelength of light will promote an electron from. The colour of the complex is ______.
The trend of which property is represented by the following graph?
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.
Describe the oxidising action of potassium dichromate and write the ionic equation for its reaction with H2S.
Decide which of the following atomic numbers are the atomic numbers of the inner transition elements:
29, 59, 74, 95, 102, 104
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:
Oxidation states
