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प्रश्न
Answer the following question:
Which element of the first transition series has lowest enthalpy of atomisation?
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उत्तर
Zinc is the element of the first transition series that has the lowest enthalpy of atomisation. The electronic configuration of zinc is: \[\ce{3d^10 4s^2}\]. This is because it has filled 3d-subshell and filled 4s-subshell so no unpaid electron is available for metallic bonding.
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संबंधित प्रश्न
Why is Sc3+ colourless while Ti3+ coloured? (Atomic number Sc = 21, Ti =22)
Why +2 oxidation state of manganese is more stable?
Why do the transition elements have higher enthalpies of atomisation?
Account for the following:
Zn is not considered as a transition element.
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.
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?
Comment on the statement that elements of the first transition series possess many properties different from those of heavier transition elements.
Complete and balance the following chemical equations
`MnO_4^(-) + H_2O + I^(-) ->`
Dissociation of H2S is suppressed in acidic medium.
Electronic configuration of a transition element X in +3 oxidation state is [Ar]3d5. What is its atomic number?
Why EΘ values for Mn, Ni and Zn are more negative than expected?
Although \[\ce{Cr^3+}\] and \[\ce{Co^2+}\] ions have same number of unpaired electrons but the magnetic moment of \[\ce{Cr^3+}\] is 3.87 B.M. and that of \[\ce{Co^2+}\] is 4.87 B.M. Why?
Why are fluorides of transition metals more stable in their higher oxidation state as compared to the lower oxidation state?
Which of the following is non-metallic?
On adding NaOH, solution to the aqueous solution of K2CrO7 the colour of the solution changes from
Account for the following:
Sc3+ is colourless whereas Ti3+ is coloured in an aqueous solution.
Account for the following:
Copper has an exceptionally positive `"E"_("M"^(2+)//"M")^0` value.
Account for the following:
Zirconium (Zr) and Hafnium (Hf) are difficult to separate.
