Multiple Choice QuestionsWhich ofthe following lanthanoid ions is diamagnetic?
(At. nos. Ce = 58, Sm = 62, Eu = 63, Yb= 70)
Ce2+
Sm2+
Eu2+
Yb2+
Platinum, palladium and iridium are called noble metals because:
Alfred Nobel discovered them
they are shining lustrous and pleasing to look at
they are found in native state
they are inert towards many common reagents
Cupric compounds are more stable than their cuprous counterparts in solid state. This is because
the endothermic character of the 2nd IP of Cu is not so high
size of Cu2+ is less than Cu+
Cu2+ has stable electronic configuration as compared to Cu+
the lattice energy released for cupric compounds is much higher than Cu+
A.
the endothermic character of the 2nd IP of Cu is not so high
B.
size of Cu2+ is less than Cu+
D.
the lattice energy released for cupric compounds is much higher than Cu+
Electronic configuration of cuprous (Cu+) and cupric (Cu2+) ions are as follows-
Cu+ = [Ar] 3d104s0
Cu2+ = [Ar] 3d94s0
Electronic configuration of Cu+ is more stable as compared to Cu2+. It is because in Cu2+(small size) the nuclear charge is sufficient to hold 27 electrons whereas in Cu+ such condition is not possible.
Further, the IInd IP of Cu is not very high as compared to its Ist IP. Consequently a large amount of lattice energy is released for cupric compounds as compared to Cu+ compounds.
Short Answer TypeMultiple Choice QuestionsAnhydrous ferric chloride is prepared by:
dissoving Fe(OH)3 in concentrated HCl
dissolving Fe(OH)3 in dilute HCl
passing dry HCl overheated iron scrap
passing dry Cl2 gas overheated iron scrap
When H2S gas is passed in a metal sulphate solution in presence of NH4OH, a white precipitate is produced. The metal is identified as:
Zn
Fe
Pb
Hg
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