CBSE
Multiple Choice QuestionsA magnetic moment of 1.73 BM will be shown by one among the following
[Cu(NH3)4]2+
[Ni(CN)4]2-
TiCl4
[CoCl6]4-
The stable bivalency of Pb and trivalencey of Bi is:
due to d contraction in Pb and Bi
due to relativistic contraction of the 6s orbitals of Pb and Bi, leading to inert pair effect
due to screening effect
due to the attainment of noble liquid configuration
Short Answer TypeExplain briefly the cause of Lanthanoid contraction.
Multiple Choice QuestionsWhich of the following compound is not coloured?
Na2[CuCl4]
Na2[CdCl4]
K4[Fe(CN)6]
K3[Fe(CN)6]
Assertion: Cuprous ion (Cu+) is colorless whereas cupric ion (Cu2+) is blue in the aqueous solution.
Reason: Cuprous ion (Cu+) has unpaired electrons while cupric ion (Cu2+) does not.
If both assertion and reason are true and reason is a correct explanation of the assertion.
If both the assertion and reason are true but the reason is not a correct explanation of the assertion.
If the assertion is true but the reason is false.
If both the assertion and reason are false.
Which ofthe following lanthanoid ions is diamagnetic?
(At. nos. Ce = 58, Sm = 62, Eu = 63, Yb= 70)
Ce2+
Sm2+
Eu2+
Yb2+
The electronic configuration of Cu is
[Ne] 3s2, 3p6, 3d9, 4s2
[Ne] 3s2, 3p6, 3d10, 4s1
[Ne] 3s2, 3p6, 3d3, 3d9, 4s2, 4p6
[Ne] 3s2, 3p6, 3d5, 4s2, 4p4
Which of the following does not give oxygen on heating?
KClO3
Zn(ClO3)2
K2Cr2O7
(NH4)2Cr2O7
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+
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
