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प्रश्न
What may be the stable oxidation state of the transition element with the following d electron configurations in the ground state of their atoms?
3d3, 3d5, 3d8 and 3d4
उत्तर
3d3: Stable oxidation state will be +5 due to outer electronic configuration 3d3 4s2 (+2, +3, +4, +5).
3d5: Stable oxidation states will be +2 and +7 due to outer electronic configuration 3d5 4s2 (+2, +3, +4, +6, +7).
3d8: Stable oxidation state will be +2 due to outer electronic configuration 3d8 4s2 (+2, +3, +4).
3d4: Stable oxidation states will be +3 and +6 due to the outer electronic configuration 3d4 4s2.
There is no d4 configuration in ground state, as it becomes 3d5 4s1.
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संबंधित प्रश्न
Why are Mn2+ compounds more stable than Fe2+ towards oxidation to their +3 state?
For M2+/M and M3+/M2+ systems, the EΘ 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+.
How would you account for the following:
The d1 configuration is very unstable in ions.
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:
Electronic configurations
Write the factors which are related to the colour of transition metal ions.
Explain why transition elements form alloys.
When acidified \[\ce{K2Cr2O7}\] solution is added to \[\ce{Sn^{2+}}\] salts then \[\ce{Sn^{2+}}\] changes to ______.
Transition elements show magnetic moment due to spin and orbital motion of electrons. Which of the following metallic ions have almost same spin only magnetic moment?
(i) \[\ce{Co^{2+}}\]
(ii) \[\ce{Cr^{2+}}\]
(iii) \[\ce{Mn^{2+}}\]
(iv) \[\ce{Cr^{3+}}\]
Which of the following ions show higher spin only magnetic moment value?
(i) \[\ce{Ti^3+}\]
(ii) \[\ce{Mn2+}\]
(iii) \[\ce{Fe2+}\]
(iv) \[\ce{Co3+}\]
Identify the metal and justify your answer.
Carbonyl \[\ce{M(CO)5}\]
The standard electrode potentials of four elements A, B, C and D are – 3.05, – 1.66, – 0.40 and + 0.80. The highest chemical reactivity will be exhibited by
Which of the following maxm magnetic moment?
On adding NaOH, solution to the aqueous solution of K2CrO7 the colour of the solution changes from
Which of the following transition metal is not coloured?
Account for the following:
Ce4+ is a strong oxidising agent.
Which property of transition metals enables them to behave as catalysts?
A transition element X has an electronic configuration [Ar]4s23d3. Predict its likely oxidation states.
Write the ionic equation for reaction of KI with acidified KMnO4.
The compounds of \[\ce{Ti^4+}\] ions are colourless due to ______.
For M2+/M and M3+/M2+systems, the EΘ 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 ease with which iron can be oxidised as compared to a similar process for either chromium or manganese metal.
