Advertisements
Advertisements
प्रश्न
The magnetic moment is associated with its spin angular momentum and orbital angular momentum. Spin only magnetic moment value of \[\ce{Cr^{3+}}\] ion is ______.
पर्याय
2.87 B.M.
3.87 B.M.
3.47 B.M.
3.57 B.M.
Advertisements
उत्तर
The magnetic moment is associated with its spin angular momentum and orbital angular momentum. Spin only magnetic moment value of \[\ce{Cr^{3+}}\] ion is 3.87 B.M..
Explanation:
\[\ce{Cr -> (Z = 24)}\]
\[\ce{Cr^{3+} -> (Z = 21)}\]
\[\ce{1s^2 2s^2 2P^6 3s^2 3p^6 3d^3 4s^0}\]
n = 3(3 unpaired electrons)
`mu = sqrt(n(n + 2))`
`mu = sqrt(3(3 + 2))`
`mu = sqrt(3(5))`
`mu = sqrt(15)` = 3.87 B.M.
APPEARS IN
संबंधित प्रश्न
What are interstitial compounds?
Why do interstitial compounds have higher melting points than corresponding pure metals?
How would you account for the following?
Transition metals exhibit variable oxidation states.
The elements of 3d transition series are given as: Sc Ti V Cr Mn Fe Co
Answer the following: Which element has the highest m.p?
What are the characteristics of the transition elements and why are they called transition elements?
For M2+/M and M3+/M2+ systems, the E° values for some metals are as follows:
| Cr2+/Cr | −0.9 V |
| Mn2+/Mn | −1.2 V |
| Fe2+/Fe | −0.4 V |
| Cr3/Cr2+ | −0.4 V |
| Mn3+/Mn2+ | +1.5 V |
| Fe3+/Fe2+ | +0.8 V |
Use this data to comment upon:
- The stability of Fe3+ in acid solution as compared to that of Cr3+ or Mn3+ and
- the ease with which iron can be oxidised as compared to a similar process for either chromium or manganese metal.
Compare the stability of +2 oxidation state for the elements of the first transition series.
Write the formula of an oxo-anion of Chromium (Cr) in which it shows the oxidation state equal to its group number
An analysis shows that FeO has a non-stoichiometric composition with formula Fe0.95O. Give reason.
Why do transition metal ions possess a great tendency to form complexes?
Which of the following will not act as oxidising agents?
(i) \[\ce{CrO3}\]
(ii) \[\ce{MoO3}\]
(iii) \[\ce{WO3}\]
(iv) \[\ce{CrO^{2-}4}\]
Answer the following question:
Which element of the first transition series has highest second ionisation enthalpy?
It has been observed that first ionization energy of 5 d series of transition elements are higher than that of 3d and 4d series, explain why?
The product of oxidation of I– with \[\ce{MnO^{-}4}\] in alkaline medium is:-
Passing H2S gas into a mixture of Mn2+ and Ni2+, Cu2+, ions in an acidified aqueous solution precipitates.
The complex showing a spin-span magnetic moment of 2.82 B.M. is :-
Account for the following:
Transition metals form alloys.
In order to protect iron from corrosion, which one will you prefer as a sacrificial electrode, Ni or Zn? Why? (Given standard electrode potentials of Ni, Fe and Zn are -0.25 V, -0.44 V and -0.76 V respectively.)
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:
Atomic sizes
