CBSE
Which is not true statement ?
Ions of d-block elements are coloured due to d-d transition
Ions of f-block elements are coloured due to f-f transition
[Sc(H2O)6]3+ , [Ti(H2O)6]4+ are coloured complexes
Cu+ is colourless ion
The reaction between metallic silver and aqueous NaCN forming a soluble complex occurs in the presence of :
nitrogen
oxygen
helium
chlorine
Which one is colourless ?
Co2+
Ni2+
Fe3+
Cu+
In first transition series, which element show maximum oxidation states :
Co
Mn
Cr
Fe
The most paramagenetic is :
Cr3+
Co2+
Mn2+
Fe2+
The diamagnetic species is
[Ni(CN)4]2-
[Ni(Cl)4]2-
[CoCl]2-
[CoF6]3-
Enrichment of U235 is done by
IF7
CIF3
IF3
ClF5
Colour imparted by Co(II) compounds to glass is
green
brown
violet
blue
In presence of acidic medium, KMnO4 converts H2S into
Mn only
MnS only
MnS + S
S only
Lanthanides and actinides are also called :
short periods
inner-transition elements
long periods
main transition elements