(a) Write down any three similarities between lanthanoids and actinoids. (b) Out of `Co^(2+)` and `Zn^(2+)` which will be paramagnetic and why? (c) Draw the structure of permanganate ion.

Out of Fe^(2+) and Fe^(3+) which is more paramagnetic and why?

Write any three rational numbers between -2 and 0.

Out of Li^+, Be^(2+) and B^(3+) ions, which has the smallest ionic radius and why?

(a) What is lanthanoid contraction and write its consequences ? (b) Draw the structure of dichromate ion.

(a) Give three points of difference between lanthanoids and actinoids. (b) Give reason and select on one atom/ion which will exhibit asked property: (i) Sc^(3+) or Cr^(3+) (exhibit diamagnetic behaviour) (ii) Cr or Cu (high melting and boiling point)

(i)with reference to structural variability and chemical reactivity write the differences between lanthanoids and actinoids (ii) Mame a member of the lanthanoid series which is well known to exhibit +4 oxidation state (iii) Complete the following equation : MnO_(4)^(-)+8H^(+)+5e^(-)rarr (iv) out of Mn^(3+) and Cr^(3+) which is ore paramagnetic and why? Atomic nos : Mn =25 Cr =24

(a) Give two differences between Lanthanoids and Actinoids. (b) How many unpaired electrons are present in Fe^(3+) and Zn^(2+) (c) Why is La(OH)_3 stronger base while Lu(OH)_3 is weaker base?