Advertisements
Advertisements
प्रश्न
Why do the transition elements have higher enthalpies of atomisation?
Explain giving reason:
The enthalpies of atomisation of the transition metals are high.
How would you account for the following?
The transition elements exhibit high enthalpies of atomization.
How would you account for the following:
The transition elements have high enthalpies of atomization?
Give a reason for the following:
Transition elements have high enthalpies of atomization.
Advertisements
उत्तर
- Transition elements have high enthalpies of atomization due to the presence of many unpaired electrons in their atoms.
- Unpaired electrons lead to strong interatomic interactions and stronger metallic bonding between atoms.
- The stronger the metallic bonds, the more energy is required to break these bonds, resulting in higher enthalpies of atomization.
- Elements of the second and third transition series have even higher enthalpies due to more frequent metal-metal bonding.
- This strong bonding also explains their high melting and boiling points.
APPEARS IN
संबंधित प्रश्न
ln which pair highest oxidation states of transition metals are found:
Account for the following:
Cr2+ is a strong reducing agent.
In what way is the electronic configuration of the transition elements different from that of the non-transition elements?
What is meant by ‘disproportionation’?
Write the factors which are related to the colour of transition metal ions.
Following are the transition metal ions of 3d series:
Ti4+, V2+, Mn3+, Cr3+
(Atomic numbers: Ti = 22, V = 23, Mn = 25, Cr = 24)
Answer the following:
1) Which ion is most stable in an aqueous solution and why?
2) Which ion is a strong oxidising agent and why?
3) Which ion is colourless and why?
Why does the density of transition elements increase from Titanium to Copper? (at. no. Ti = 22, Cu = 29)
How is potassium dichromate prepared from chrome iron ore?
Why EΘ values for Mn, Ni and Zn are more negative than expected?
The orientation of an atomic orbital is governed by
Which of the following statements is not correct?
Which of the following maxm magnetic moment?
Which one of the following characters tie of the transition metal is associated with higher catalytic activity?
On adding NaOH, solution to the aqueous solution of K2CrO7 the colour of the solution changes from
Why Zn, Cd and Hg are not called transition metals?
Which of the following characteristics of transition metals is associated with their catalytic activity?
Account for the following:
Ce4+ is a strong oxidising agent.
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?
A transition element X has an electronic configuration [Ar]4s23d3. Predict its likely oxidation states.
Describe the oxidising action of potassium dichromate and write the ionic equation for its reaction with iron (II) solution.
