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Transition elements and Co-ordination chemistry

1. [Ni(CN)4]2- and [NiCl4]2- complex ions are

1) both diamagnetic                  2) both paramagnetic

3) diamagnetic  and paramagnetic respectively

4) antiferromagnetic and paramagnetic respectively

 

2. For magnesium complex of EDTA2- the number of  N - donor and O - donor centres are respectively

1) two and four              2) two and two             3) two and six            4) two and eight

 

3. Two complexes [Cr(H2O)6]Cl3 (A) and [Cr(NH3)6]Cl3 (B) are violet and yellow coloured respectively. The incorrect statement regarding them is

1) ∆0 value of (A) is less than that of (B)

2) ∆0 value of (A) and (B) are calculated from the energies of violet and yellow light respectively

3) Both absorb energies corresponding to their complementary colours

4) Both are paramagnetic with three unpaired electrons
 

4. The complex that has highest crystal field splitting energy (∆) is

1) K3[Co(CN)6]            2) [Co(NH3)5(H2O)]Cl3

3) K2[CoCl4]               4) [Co(NH3)5Cl]Cl2
 

5. Hybridisation of Co in [Co(NH3)6]3+ and Ni in [Ni(NH3)6]2+ respectively

1) d2sp3, sp3d2             2) sp3d2, d2sp3

3) d2sp3, d2sp3         4) sp3d2, sp3d2
 

6. In the complex ion [Fe(H2O)5NO]2+

1) Fe is in the +1 O.S and NO coordinates as NO+ (Nitrosonium ion)

2) Fe is in the +1 O.S and NO coordinates as neutral NO (Nitrosyl radical)

3) Fe is in the +3 O.S and NO coordinates as NO-

4) Fe is in the +2 O.S and NO coordinates as NO+
 

7. Cinnabar is the ore of

1) Zn             2) Cd           3) Hg              4) Ag
 

8. The transition element that has lowest enthalpy of atomization is

1) Zn          2) Cu          3) V          4) Fe
 

9. One mole of the complex compound CoCl3. 5 NH3 gives 3 moles of ions on dissolution in water. One mole of the same complex reacts with two moles of AgNO3 solution to yield two moles of AgCl. The structure of the complex is

1) [Co(NH3)4Cl]Cl2. NH3          2) [Co(NH3)4Cl2]Cl.NH3

3) [Co(NH3)5Cl]Cl2                4) [Co(NH3)3Cl3].2NH3
 

10. Of the following outer electronic configuration of atoms, the highest oxidation state is achieved by which one of them?

1) (n - 1)d8ns2             2) (n - 1)d5ns1

3) (n - 1)d3ns2            4) (n - 1)d5ns2
 

11. The ligand system present in vitamin B12 is

1) porphyrin            2) corrin

3) phthalocyanine       4) crown ether
 

12. Na2S give purple colour with sodium nitroprusside, purple colour has formulae
1) Na2[Fe(CN)6S]                2) Na2[Fe(CN)5NOS]
3) Na4[Fe(CN)5NOS]        4) KFe[Fe(CN)5COS]

 

13. The oxidation number of the central metal ion in Wilkinson’s catalyst is
1) +1         2) +4           3) +2             4) +6

 

14. If the transition elements exist in more than one oxidation states, their relative stabilities can be known from
1) Elecronegativity values
2) Standard electrode potential
3) Heat of formation
4) Ionic radii

 

15. The correct order of d−orbital splitting in a square planar geometry is
1) dxz ∼ dyz < dx2-y2 < dxy < dz2
2) dxz ∼ dyz < dxy < dz2 < dx2-y2
3) dxz ∼ dyz < dz2 < dxy < dx2-y2
4) dz2 < dxy < dxz ∼ dyz < dx2-y2

 

16. For which pair of complexes, the order of values of ∆0 is correct?
1) [Rh(NH3)6]3+ > [Co(NH3)6]3+
2) [Fe(CN)6]4- > [Fe(CN)6]3- 
3) [Cr(CH2)6]2+ > [Cr(OH)2]3+
4) [CrF6]3- > [Cr(CN)6]3- 

 

17. The highest value of the calculated spin only magnetic moment (in BM) among all the transition metal complex is
1) 5.92             2) 3.87            3) 6.93            4) 4.90

 

18. Match the catalysts (Column I) with product (Column II).
Column I                     Column II
Catalysts                       Product
A) V2O5                     i) Polyethylene
B) TiCl3/Al(Me)3        ii) Ethanol
C) PdCl2                iii) H2SO4
D) Iron oxide         iv) NH3
1) A-ii, B-iii, C-i, D-iv          2) A-iii, B-iv, C-i, D-ii  
3) A-iv, B-iii, C-ii, D-i          4) A-iii, B-i, C-ii, D-iv

 

19. The number of water molecule(s) not coordinated to copper ion directly in CuSO4.5H2O is
1) 3              2) 4             3) 5                4) 1

 

20. Which of the following is considered to be anti cancer species? 

 

ANSWERS: 1-3; 2-1; 3-2; 4-1; 5-1; 6-1; 7-3; 8-2; 9-3; 10-4; 11-2; 12-3; 13-1; 14-2; 15-3; 16-1; 17-1; 18-4; 19-4; 20-2.

Posted Date : 25-08-2021

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