NEET Questions Solved

NEET - 2006

In which of the following pairs are both the ions coloured in aqueous solution?

(a) Ni2+, Ti3+              (b) Sc3+, Ti3+

(c) Sc3+, Co2+            (d) Ni2+, Cu+

(At. no : Sc =21, Ti = 22, Ni = 28, Cu = 29, Co = 27)

Concept Videos :-

#1 | Intro to d-Block
#2 | 3d Series: I
#3 | 3d Series: II
#4 | Properties of 4d & 5d Elements
#5 | Trends of d Block Elements : I
#6 | Trends of d Block Elements: II
#9 | Reactions of d Block

Concept Questions :-

d-Block Elements,Physical and Chemical properties.

(a) 28Ni = 1s2, 2s22p6, 3s23p63d8, 4s2

                          3d8

              

     Ni2+ = 1s2, 2s22p6, 3s23p63d8

     22Ti = 1s2, 2s22p6, 3s23p63d2, 4s2

       

    Ti3+ = 1s2, 2s22p6, 3s23p63d1

    21Sc = 1s2, 2s22p6, 3s23p63d1, 4s2

    Sc3+ = 1s2, 2s22p6, 3s23p6

 (unpaired electron in d-orbital is not possible)

    29Cu = 1s2, 2s22p6, 3s23p63d10, 4s1

       Cu+ = 1s2, 2s22p6, 3s23p63d10

                           (complete d-orbital)

 Hence, in above ions, Ni2+ and Ti3+ ions are coloured ions in aqueous solution due to presence of unpaired electrons in d-subshell.

 

Difficulty Level:

  • 65%
  • 13%
  • 9%
  • 14%
Crack NEET with Online Course - Free Trial (Offer Valid Till September 23, 2019)