The d-And-f-Block Elements

Short Answer Type

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Explain why Cu+ ion is not stable in aqueous solutions?

 Cu+ in aqueous solution undergoes disproportionation i.e.,
2Cu+(aq) → Cu2+(aq) + Cu(s)
The E°, value for this is favourable.

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    Calculate the 'spin only' magnetic moment of M2+(aq) ion (Z = 27).
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    How would you account for the irregular variation of ionisation enthalpies (first and second) in the first series of the transition elements?

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    On what ground can you say that scandium (Z = 21) is a transition element but zinc (Z = 30) is not?
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    Which is a stronger reducing agent Cr2+ or Fe2+ and why?

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    The E° (M2+/M) value for copper is positive (+ 0.34 V). What is possibility the reason for this? 
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    Why is the highest oxidation state of a metal exhibited in its oxide or fluoride only?
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    In the series Sc (Z = 21) to Zn(Z = 30), the enthalpy of atomisation of zinc is the lowest i.e., 26, kJ mol. Why?
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    Actinoid contraction is greater from element to element than lanthanoid contraction. Why?
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    Silver atom has a completely filled d orbitals (4d10) in its ground state. How can you say that it is a transition element?
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