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प्रश्न
Answer the following question:
Which element of the first transition series has highest third ionisation enthalpy?
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उत्तर
Among the elements of first transition series zinc has the highest third ionisation enthalpy. Electronic configuration of zinc is: \[\ce{3d^10 4s^2}\]
After the loss of two electrons from 4s orbital, Z and +2 Ion acquires \[\ce{3d^10}\] fully filled configuration which is highly stable therefore removal of third electron from \[\ce{3d^10}\] orbital will be more difficult and requires a large amount of energy.
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संबंधित प्रश्न
Which metal in the first transition series (3d series) exhibits + 1 oxidation state most frequently and why?
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^+ ->`
Account for the following:
Mn shows the highest oxidation state of +7 with oxygen but with fluorine, it shows oxidation state of +4.
|
`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.
How is the variability in oxidation states of transition metals different from that of the non-transition metals? Illustrate with examples.
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 are inner transition elements?
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 down the number of 3d electrons in the following ion:
Cu2+
Indicate how would you expect the five 3d orbitals to be occupied for this hydrated ions (octahedral).
Which one of the following ions is coloured?
Complete and balance the following chemical equations
`MnO_4^(-) + H_2O + I^(-) ->`
Explain why transition elements form alloys.
Explain why transition metals and their compounds act as a catalyst.
The second and third rows of transition elements resemble each other much more than they resemble the first row. Explain why?
Catalytic hydrogenation of benzene gives
Which one of the following characters tie of the transition metal is associated with higher catalytic activity?
Agcl is soluble in NH4OH. The solubility is due to the information of:-
Which of the following transition metal is not coloured?
Which of the following characteristics of transition metals is associated with their catalytic activity?
The second ionization enthalpies of chromium and manganese are 1592 and 1509 kJ/mol respectively. Explain the lower value of Mn.
