Term : II Course Code : CHE101 Course Title: Chemistry Max. Marks: 7

Term : II Course Code : CHE101 Course Title: Chemistry Max. Marks: 7 Part A
Q.1 a) By metal plating of iron how can we prevent it from corrosion? Which things we need to keep in mind for selecting these coating metals?
b) Sc Ti can have both +2 and +3 oxidation state easily but why it is not possible for Ni and Cu to have +3 oxidation state?
Q.
HOME WORK: 3Term : II Course Code : CHE101 Course Title: Chemistry Max. Marks: 7 Part A
Q.1 a) By metal plating of iron how can we prevent it from corrosion? Which things we need to keep in mind for selecting these coating metals?
b) Sc Ti can have both +2 and +3 oxidation state easily but why it is not possible for Ni and Cu to have +3 oxidation state?
Q.2 Name the coordination complexes and find oxidation number of the metal ion in following complexes:
i) [Pt(NH3)5Cl]Br3 v) [CoCl(NH3)5]Cl2
ii) [Co(NH3)5 Cl]Cl2 vi) Na2[NiCl4]
iii) K4 [Fe(CN)6] vii) [Co(SO4)(NH3)5]+
iv) (NH4)2[Ni(C2O4)2(H2O)2]
Q.3 Write the formula of each of the following complexes:
i) hexaammineiron(III) hexacyanochromate (III) ii) potassium tetracyanocuprate(II)
iii) pentaaquahydroxoiron(III) ion iv) potassium trioxalatoaluminate(III)
v) sodium monochloropentacyanoferrate(III) vi) pentaamminebromocobalt(III) sulfate
vii) tris(ethylenediamine)cobalt(III) sulfatePart B
Q.4 a) As we move from scandium to copper atomic radii are decreasing very gradually but when we move from sodium to argon atomic radii are decreasing very rapidly. Explain your reason.
b) Write electronic configuration of following transition metal ions:
Cu+ Fe2+ Mn2+ Cr3+ Ni2+ Sc3+ Co2+
Q.5 a) The [Ni(CN)4]2- ion is having square planar geometry whereas [Ni(Cl)4]2- ion has tetrahedral geometry. On the basis of crystal field splitting diagram of both these complexes explain their magnetic nature.
b) Predict the number of unpaired electrons in the following complex ions:
i) [Cr (H2O)6]3+ ii) [Cr (H2O)6]2+ iii) [FeF6]3-
Q6. Calculate the CFSE for the following complexes:
d5 high spin octahedral v) [Cr(CN)6]4-
d6 low spin octahedral vi) [Co(NH3)6]3+
d7 tetrahedral vii) [CuCl4]2-
d3 tetrahedralrom scandium to copper atomic radii are decreas
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