Advertisements
Advertisements
Question
Explain why is Fe3+ more stable than Fe2+?
Advertisements
Solution
Electronic configuration of Fe2+ : 1s2 2s2 2p6 3s2 3p6 3d6
Electronic configuration of Fe3+ : 1s2 2s2 2p6 3s2 3p6 3d5
Due to the presence of half filled ‘d’ orbital, Fe3+ is more stable than Fe2+.
APPEARS IN
RELATED QUESTIONS
Why do interstitial compounds have higher melting points than corresponding pure metals?
Calculate magnetic moment of `Fe_((aq))^(2+) ion (Z=26).`
Why do the transition elements have higher enthalpies of atomisation?
In 3d series (Sc to Zn), which element has the lowest enthalpy of atomisation and why?
How would you account for the following : Transition metals form coloured compounds
|
`E_((M^(2+)/M)` |
Cr | Mn | Fe | Co | Ni | Cu |
| -0.91 | -1.18 | -0.44 | -0.28 | -0.25 | -0.34 |
From the given data of E0 values, answer the following questions :
(1) Why is `E_(((Cu^(2+))/(Cu)))` value exceptionally positive
(2) Why is `E_(((Mn^(2+))/(Mn)))` value is highly negative as compared to other elements
(3) Which is the stronger reducing agents Cr2+ or Fe2+ ? Give Reason.
Out of Mn3+ and Cr3+, which is more paramagnetic and why ?
(Atomic nos. : Mn = 25, Cr = 24)
How would you account for the following:
Cobalt (II) is stable in aqueous solutions, but in the presence of complexing reagents, it is easily oxidised.
What is meant by ‘disproportionation’?
Calculate the number of unpaired electrons in the following gaseous ions:
Mn3+, Cr3+, V3+ and Ti3+. Which one of these is the most stable in an aqueous solution?
Write the factors which are related to the colour of transition metal ions.
Write the formula of an oxo-anion of Chromium (Cr) in which it shows the oxidation state equal to its group number
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?
How would you account for the following?
Transition metals and their compounds act as catalysts.
Give reason for the following:
The transition metals generally form coloured compounds.
Transition metals with lowest melting point is ______.
Why EΘ values for Mn, Ni and Zn are more negative than expected?
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.
The orientation of an atomic orbital is governed by
On adding NaOH, solution to the aqueous solution of K2CrO7 the colour of the solution changes from
Why are all copper halides known except that copper iodide?
Which of the following characteristics of transition metals is associated with their catalytic activity?
Which one among the following metals of the 3d series has the lowest melting point?
Which of the following transition metals shows +1 and +2 oxidation states?
The trend of which property is represented by the following graph?
Explain the magnetic properties of d-block (or transition) elements.
The E° value for the Mn2+/Mn2+ couple is more positive than that of Cr3+/Cr2+ or Fe3+/Fe2+ due to the change of:
