Transition and InnerTransition Elements - Result Question 82

####8. The correct order of atomic radii is

(2019 Main, 12 Jan II)

(a) Ho>N>Eu>Ce

(b) N>Ce>Eu>Ho

(c) Eu>Ce>Ho>N

(d) Ce>Eu>Ho>N

9A4KOH,O22B( Green )+2H2O

3B4HCl2C (Purple) +MnO2+2H2O

2CH2O,KI2A+2KOH+D

In the above sequence of reactions, A and D, respectively, are

(2019 Main, 11 Jan II)

(a) KI and KMnO4

(c) KI and K2MnO4

(b) MnO2 and KIO3

(d) KIO3 and MnO2

Show Answer

Solution:

  1. The correct order of atomic radii is

Note

(i) N being the member of p-block and second period, have the smallest radii.

(ii) Rest of all the 3 members are lanthanides with Eu having stable half-filled configuration thus with bigger size than rest two.

(iii) Among Ce and Ho, Ce has larger size which can be explained on the basis of “Lanthanoid contraction”.



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