(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)

Explain, giving reasons, which one of the following pairs exhibits the property indicated : Sc^(3+) or Cr^(3+) exhibits paramagnetism .

(i) With reference to structural variability and chemical reactivity, write the differences between lanthanoids and actinoids. (ii) Name a member of the lanthanoid series which is well known to exhibit + 4 oxidation states. (iii) Complete the following equation: MnO_4^(-) + 8H^(+) + 5e^(-) to (iv) Out of Mn^(3+) and Cr^(3+) , which is more paramagnetic and why? (Atomic nos.: Mn = 25, Cr = 24)

(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

Decide giving reasons which one of the following exhibits the property indicated :L (i) Sc^(3+) and Cr^(3+) exhibit paramanetism (ii) V or Mn exhibits more number of oxidation sates (at. No Sc= 21 , V =23 , Cr = 24 , Mn=25)

Which one of the following exhibits paramagnetism? Sc^(3+),Cr^(3+),Cu^(+),Zn^(2+)

(i)with reference to structural variability and chemical reactivity write the differences between lanthanoids and actinoids (ii) Name a member of the lanthanoid series which is well known to exhibit +4 oxidation state

Which element exhibits highest debsity in 3d series Sc Cr Zn Cu

Give reasons for the following : (i) Metals are good conductors of electricity whereas non-metals are not. (ii) Ionic compounds have usually high melting and boiling points.