Multiple Choice QuestionsThe pair in which both species have same magnetic moment (spin only value) is
[Cr(H2O)6]2+,[CoCl4]2+
[Cr(H2O)6]2+,[Fe(H2O)6]2+
[Mn(H2O)6]2+, [Cr(H2O)6]2+
[CoCl4]2-, [Fe(H2O)6]2+
The colour imparted by Co(II) compounds to glass is
green
deep-blue
yellow
red
B.
deep-blue
Glass is an amorphous and transparent or translucent solid obtained by solidification of a mixture of silicates of different metals, one of which is always an alkali metal. Addition of small amounts of transition metal salts to the glass mixture imparts colour to the glass. For example, addition of small amounts of Fe3+,Fe2+ ,Co2+ ,Cr3+and Mn4+ salts imparts yellow-brown, light blue, deep blue, green or violet colour respectively.
The magnetic moment of K3[Fe(CN)6] is found to be 1.7 BM .How many unpaired electron (s) is/are present per molecule ?
1
2
3
4
An aqueous solution of CoCl2 on addition of excess of concentrated HCl turns blue due to formation of
[Co(H2O)4Cl2]
[Co(H2O)2Cl4]2-
[CoCl4]2-
[Co(H2O)2Cl2]
In which of the following pairs both the complexes show optical isomerism?
cis-[Cr(C2O4)2Cl2]3-, cis-[Co(NH3)4Cl2]
[Co(en)3]Cl3, cis-[Co(en)2Cl2]Cl
[PtCl(dien)]Cl, [NiCl2Br2]2-
[Co(NO3)3(NH3)3], cis-[Pt(en)2Cl2]
The correct order for the wavelength of absorption in the visible region is
[Ni(NO2)6]4- < [Ni(NH3)6]2+ < [Ni(H2O)6]2+
[Ni(NO2)6]4- < [Ni(H2O)6]2+ < [Ni(NH3)6]2+
[Ni(H2O)6]2+ < [Ni(NH3)6]2+ < [Ni(NO2)6]4-
[Ni(NH3)6]2+ < [Ni(H2O)6]2+ < [Ni(NO2)6]4-
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