Home/Transition Elements
General Features (Atomic radius, Electronic structure, Binding energy, Variable oxidation state, paramagnetic and diamagnetic behavior, Color complexes)
Question#1
The Calculated spin only magnetic moment of Cr2+ ion is ? [NEET-2020]
Electronic configuration of Cr _ [Ag]3d54s1
Electronic configuration of Cr- [Ag]3d4
Number of unpaired e_ = 4
Spin only magnetic moment = \( \sqrt{n(n+2} \)
n = Number of unpaired e_
Spin only magnetic moment = \( \sqrt{4(4+2} \) = \( \sqrt{24} \ BM \)
= 4.9 BM
Question#2
Which of the following transition metal show 3d5 configuration in its +2 oxidation state [MDCAT2023]
Mn = [Ar]4s2,3d5
Mn+2 = [Ar],3d5
Question#3
The coordination number of a metal in coordination compounds is [MP PET 1996; KCET (Engg./Med.) 1999]
Question#4
The coordination number of Pt in \( [Pt(NH_3)_4Cl_2]^{++} \) ion is [MP PET 1995]
Question#5
Scandium has the atomic number 21, which one will be its electronic configuration MDCAT2017
Question#6
Which element of 3-d series of periodic table show electronic configuration of \( 3d^8 . 4s^2 \) MDCAT2016
Question#7
The electronic configuration of [Au79] is MDCAT2015
Question#8
Which pair of transition elements shows the abnormal electronic configuration? MDCAT2012
Question#9
The Highest oxidation state of Manganese \( 3s^23p^63d^54s^2 \) is ETEA2011
Question#10
The oxidation number of Cobalt in \( [Co(en)_2H_2O(CN)]^{+2} \) ETEA2011Med
Question#11
The oxidation state of Iron in \( [Fe(CN)_6]^{-4} \) is ETEA2008
Question#12
The element which has the smallest atomic radius is ETEA2013
Sc
Ti
V
Cr Mn Zn
Fe Cu
Co Ni
Atomic radius decreases up to Ni and then increases
Question#13
Chromium compound in which oxidation is +6 behaves as ETEA2015
Cr+6 wouldn't be able to donate electrons as it has donated all of them from the valence shell.
Question#14
Colour of \( MnO_4^{-1} \) and \( Mn^{+2} \) solution in water are respectively ETEA2016