LBS Centre for Science & Technology State Eligibility Test Chemistry Question Paper : lbscentre.info
Name of the Organisation : LBS Centre for Science & Technology
Exam : State Eligibility Test
Subject : Chemistry
Year : 2017 Feb
Document Type : Model & Past Question Papers
Website : https://lbscentre.in/
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State Eligibility Test Chemistry Question Paper :
Time : 120 Minutes :
1. The second ionization enthalpies of the 13th group elements follow the order
A) B > Al > Ga > In > Tl
B) B > Ga > Tl > In > Al
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C) B > Al > Ga > Tl > In
D) B > Ga > Tl > Al > In
2. The carborane C2B4H6 has the structure
A) Closo – tetrahedron
B) Nido – trigonalbipyramid
C) Closo – octahedron
D) Arachno – icosahedron
3. Which among the following statement is correct regarding the structures of CF4, SF4 and XeF4?
A) Structures are same with 0, 2 and 1 lone pairs of electrons respectively
B) Structures are different with 0, 1 and 2 lone pairs of electrons respectively
C) Structures are same with 0, 1 and 2 lone pairs of electrons respectively
D) Structures are different with 0, 2 and 1 lone pairs of electrons respectively
4. Which among the following is thermochromic?
A) S4N4
B) SiC
C) Al2Se3
D) XeOF4
5. Three most abundant transition metals on earth crust are
A) Fe, Co & Ti
B) Cr, Mn & Ag
C) Fe, Ti & Mn
D) V, Mn & Cu
6. Tungsten bronzes used in the production of metallic paints are non stoichiometric MxWO3. Where M is
A) Na or K
B) An alkaline earth metal
C) A lanthanide
D) All the above
7. Which among the following lanthanide ions show spin only magnetic moment?
A) Ce4+, Gd3+, Lu3+
B) Gd3+, Pm3+, Er3+
C) Ce3+, Pm3+, Er3+
D) Eu3+ Gd3+, Lu4+
8. The acidity of oxides of Mn follows the order
A) MnO < MnO2< Mn2O3 < Mn2O7
B) MnO < MnO2 < Mn2O7 < Mn2O3
C) Mn2O7 < MnO2 < Mn2O3 < MnO
D) MnO < Mn2O3 < MnO2 < Mn2O7
9. Which among the following complexes show both linkage isomerism and stereo isomerism?
(i) [Pt (Cl2) (NH3)4] Br2 (ii) [Pt(NH3)4][PtCl4]
(iii) [Co Cl(en)2NO2] Br (iv) [Co(NH3)5SCN] Cl2
A) Both (i) and (ii) only
B) (i) , (ii) & (iv) only
C) (iii) only
D) Both (iii) and (iv) only
10. Which of the following complexes show M L charge transfer?
A) [Co(CO)6]
B) KMnO4
C) [Co(NH3)6]3+
D) [Ni(H2O)6]2+
11. The ground term symbols of V3+ and Co2+ ions are respectively
A) 3F4, 4F3/2
B) 3F2, 4F7/2
C) 4F3/2
D) 3F2, 4F4/3
12. In the reaction of [Co(NCS)(NH3)5] 2+ with [Cr(H2O)6] 2+ in water as solvent, the final chromium based product/s
A) is exclusively [Cr(NCS)(H2O)5] 2+
B) contain [Cr(SCN)(H2O)5] 2+ as major component and [Cr(NCS)(H2O)5] 2+ as minor component
C) is exclusively [Cr(SCN)(H2O)5] 2+
D) contain [Cr(NCS)(H2O)5] 2+ as major component and [Cr(SCN)(H2O)5] 2+ as minor component
13. Which among the following complexes obey the 18 electron rule?
(i) IrCl2(CH3)(CO)(PPh3), (ii) Cr(?6 –C6H6)2, (iii) V(CO)6, (iv) Mn2(CO)10
A) i, ii & iv only
B) i, iii & iv only
C) i & iii only
D) ii & iv only
14. The three trinuclear carbonyls known are, Fe3(CO)12, Os3(CO)12 and Ru3(CO)12 .Choose the correct statement regarding their structures.
A) All are iso-structural.
B) Os3(CO)12 and Ru3(CO)12 are iso-structural and Fe3(CO)12 has a different structure.
C) Fe3(CO)12 and Os3(CO)12 are iso-structural and Ru3(CO)12 has a different structure.
D) Fe3(CO)12 and Ru3(CO)12 are iso-structural and Os3(CO)12 has a different structure.
15. Which among the following is a fluxional organometallic compound?
A) Mn(?5 –C5H5)2
B) Fe2(CO)9
C) Co4(CO)12
D) PdCl2(cod)