CBSE
Multiple Choice QuestionsThe 3rd transitional series contain elements having atomic numbers from:
21 to 29
21 to 30
20 to 30
21 to 31
Which one of the following represents d-block elements?
[Rn]6d2 , 7s2
[Xe]4f1 , 5d1 , 6s2
[Xe]4f14 , 5d1 , 6s2
[Xe]5d1 , 6s2
The transition metals mostly are
paramagnetic
diamagnetic
both 'a' and 'b'
neither diamagnetic nor paramagnetic
Pd has exceptional outer electronic configuration as 4d10 , 5s0. It belongs to:
4th period , group 11
5th period , group 10
6th period , group 9
3th period , group 16
For the same transition metal ion, the colour of its compounds will depend upon:
temperature of the reaction
pressure of the reaction
nature of ligands or Lewis bases attached to the metal ion
concentration of the ligands
Yellow colour of aqueous solution of potassium chromate changes to orange if dil. H2SO4 is added. It indicates:
chromate ions are reduced
chromate ions are oxidised
monocentric complex is converted into dicentric complex
oxygen gets removed from chromate ions
Which of the following dissolves in hot conc. NaOH solution?
Fe
Zn
Cu
Ag
Which of the following turns potassium dichromate paper green?
NO2
HCl
NH3
SO2
Among the oxides, Mn2O7 (I) , V2O3 (II) , V2O5 (III) , CrO (IV) , Cr2O3 (V) the basic oxides are :
I and II
II and III
III and IV
II and IV
The oxygen carrying pigment , oxyhaemocyanin containing two copper ions is diamagnetic , because :
the two copper ions are in + 1oxidation state
one copper ion is in + 1oxidation state while other is in + 2 oxidation state
of the strong antiferromagnetic interactions between two copper ions
of the ferromagnetic interactions between the two copper ions
