Chemistry Practice Paper-1 NET/GATE/SET with Answer key

By Dr. A. K. Singh Sir

Q1.    The reactions of Ni(CO)₄ with the ligand L (L=PMe₃ or P(OMe)₃) yields NiCO₃L. The reaction is:

(A)  Associative         (B) Dissociative         (C) Interchange (I_a)         (D) Interchange (I_d)

Q2.    As a ligand Cl^- is:

(A) only a σ-donor

(B) only a p-donor

(C) both a σ-donor and a p-donor

(D) a σ-donor and a p-acceptor

Q3.    In IR spectra, the stretching frequency (in cm^–1) of the carbonyl group of the following compounds is in the order:

(A)   b>a>c                   (B) a>c>b                  (C) b>c>a                  (D) c>b>a

Q4.    The light pink color of  [Co(H₂O)₆]²⁺ and the deep blue color of [CoCl4]^2- are due to

(A) MLCT transition in the first and d-d transition in the second

(B)  LMCT transition in both

(C)  d-d transitions in both

(D) d-d transition in the first and MLCT transition in the second

Q5.    In the vibrational spectrum of CO₂, the number of fundamental vibrational modes common in both infrared and Raman are

(A) three             (B) two             (C) one              (D) zero

Q6.    Which ones among CO₃^2- , SO₃, XeO₃ and NO3^2- have planar structure?

(A) CO₃^2- , SO₃, and XeO₃

(B) SO₃, XeO₃ and NO3^2-

(C) CO₃^2-, XeO₃ and NO3^2-

(D) CO₃^2- , SO₃, and NO3^2-

Q7.    The molecular that has an S₆  symmetry element is

(A) B₂H₆                (B) CH₄                (C) PH₅                 (D) SF₆

Q8.    In the IR spectrum of p-nitrophenyl acetate, the carbonyl absorption band appears at

(A) 1670 cm^-1             (B) 1700 cm^-1             (C) 1730 cm^-1             (D) 1760 cm^-1

Q9.    Consider the following statements for [18]-annulene

(a)  It is aromatic

(b)  The inner protons resonate at d 9.28 in its ¹H NMR spectrum

(c)  There are six protons in the shielded zone

(A)   a, b, c  (B) a & b only (C) b & c only (D) a & c only

Q10.  Complexes of general formula, fac-[Mo(CO)₃(phosphite)₃] have the C—O stretching bands as given below.

Phosphines: PF₃(a); PCl₃(b); P(Cl)Ph₂(c); PMe₃(d)

v(CO), cm^–1: 2090(i); 2040(ii); 1977(iii); 1945(iv)

The correct combination of the phosphine and the stretching frequency is,

(A) (a–i), (b–ii), (c–iii), (d–iv)

(B) (a–ii), (b–i), (c–iv), (d–iii)

(C) (a–iv), (b–iii), (c–ii), (d–i)

(D) (a–iii), (b–iv), (c–i), (d–ii)

Q11.  Structure of a carborane with formula, C₂B₄H₈ is formally derived from

(A) Closo-borane     (B) Nido-borane     (C) Arachno-borane     (D) Conjuncto-borane

Q12.  In the cluster [Co₃(CH)(CO)₉]  obeying 18e rule, the number of metal-metal bonds and the bridging ligands respectively, are

(A) 3 and 1 CH         (B) 0 and 3 CO         (C) 3 and 1 CO         (D) 6 and 1 CH

Q13.  Consider the ions Eu(III), Gd(III), Sm(II) and Lu(III). The observed and calculated magnetic moment values are closest for the pair

(A) Gd(III), Lu(III)       (B) Eu(III), Lu(III)      (C) Sm(III), Gd(III)       (D) Sm(III), Eu(III)

Q14.  In the solid state, the CuCl₃^5- ion has two types of bonds. These are

(A) Three long and two short        (B) Two long and three short

(C) One long and four short         (D) Four long and one short

Q15.  The platinum complex of NH₃ and Cl^– ligands is an anti-tumour agent. The correct isomeric formula of the complex and its precursor are

(A) cis-Pt(NH₃)₂Cl₂ and PtCl₄^2–                (B) trans-Pt(NH₃)₂Cl₂ and PtCl₄^2–

(C) cis-Pt(NH₃)₂Cl₂ and Pt(NH₃)₄²⁺                (D) trans-Pt(NH₃)₂Cl₂ and Pt(NH₃)₄²⁺

Q16.  Which one of the following will NOT undergo oxidative addition by methyl iodide?

(A) [Rh(CO)₂I₂]^-                               (B) [Ir(PPh₃)₂(CO)Cl]

(C) [h²-CpRh(CO)₂]                        (D) [h⁵‑Cp2Ti(Me)Cl]

Q17.  In hydrofomylation reaction using [Rh(PPh₃)₃(CO)H] as the catalyst, addition of excess PPh₃ would

(A) increase the rate of reaction                (B) decrease the rate of reaction

(C) not influence of the rate of reaction   (D) stop the reaction

Q18.  The vibrational frequency and anharmonicity constant of an alkali halide are 300 cm^–1 and 0.0025 respectively. The positions (in cm^–1) of its fundamental mode and first overtone are respectively

(A) 300, 600         (B) 298.5, 595.5         (C) 301.5, 604.5         (D) 290, 580

Q19.  4-Hydroxybenzoic acid exhibited signals at d 171, 162, 133, 122 and 116 ppm in its broadband decoupled ¹³C NMR spectrum. The correct assignment of the signals is

(A) d  171 (C-4) ,162 (COOH) ,133 (C-3 & 5) ,122 (C-1) and 116 (C-2 & 6)

(B) d  171 (COOH) ,162 (C-4) ,133 (C-2 & 6) ,122 (C-1) and 116 (C-3 & 5)

(C) d  171 (C-4) ,162 (COOH) ,133 (C-2 & 6) ,122 (C-1) and 116 (C-3 & 5)

(D) d  171 (COOH) ,162 (C-4) ,133 (C-3 & 5) ,122 (C-1) and 116 (C-2 & 6)

Q20.  Consider the following reaction mechanism The steps A, B and C, respectively, are

(A) Oxidative addition; transmetallation; reductive elimination

(B) Oxidative addition; carbopalladation; b-hydride elimination

(C) Carbopalladation; transmetallation; reductive elimination

(D) Metal halogen exchange; transmetallation; metal extrusion

Q21.  The osazone A could be obtained from

                  

(A) glucose and mannose            (B) mannose and galactose

(C) gulcose and fructose              (D) galactose and fructose

Q22.  The electronic ground state term for the chromium ion in [Cr(CN)₆]^4- is

(A) ³F                (B) ³H                 (C) ³G                 (D) ⁵D

Q23.  The lanthanide ion that exhibits  color in aqueous solution is

(A) La(III)               (B) Eu(III)               (C) Gd(III)               (D) Lu(III)

Q24.  The hapticity of  cycloheptatriene, (C₇H₈), in Mo(C₇H₈)(CO)₃ is

(A) 3                   (B) 4                   (C) 6                  (D) 7

Q25.   P, F, and I represent primitive, face-centered, and body-centered lattices, respectively. The lattice type of NaCl and CsCl, respectively, are

(A) F & I            (B) F & P            (C) I & P           (D) P & I

Q26.  The ¹³C-NMR spectrum of acetone-d6 has a signal at 30 ppm as a septet in the intensity ratio:

(A) 1:6:15:20:15:6:1

(B) 1:3:6:7:6:3:1

(C) 1:2:3:5:3:2:1

(D) 1:3:7:10:7:3:1

Q27.  In isoelectronic series VO₄^3-, CrO₄^2-, and MnO₄^- all members have intense charge transfer transition. The INCORRECT statement is

(A) The charge on the metal nucleus increases in the order VO₄^3- <CrO₄^2- <MnO₄^-

(B) The wavelengths of transitions increase in the order VO₄^3- <CrO₄^2- <MnO₄^-

(C) Charge transfer transitions are attributed to excitations of electrons from ligand to metal

(D) MnO₄ ^- exhibits charge transfer at shortest wavelength amongst the three

Q28.  The clusters Sn₅^2-, Ge₉^4-, and Rh₆(CO)₁₆  have structure respectively:

(A) nido, closo, and closo             (B) closo, nido, and arachno

(C) arachno, closo, and nido        (D) closo, nido, and closo

Q29.  While the vibrational energy of an oscillator in v = 0 state (ground state) is nonzero, the rotational energy of a rigid rotor in J = 0 state (ground state) can be zero. Pick the correct reason.

(A) Vibrational energy of an oscillator consists of both potential as well as kinetic energy whereas the rotational energy of the rotor has only the kinetic energy

(B) It is a rigid rotor

(C) Vibrational and rotational degrees of freedom are decoupled from each other

(D) None of the above

Q30.  Predict the reaction condition for the following synthetic transformation?

(A) Acid             (B) Heat             (C) Base             (D) Light

 

 

Anskey_NET-1 Questions paper

1	2	3	4	5	6	7	8	9	10
B	C	C	C	D	D	D	D	D	A
11	12	13	14	15	16	17	18	19	20
B	A	A	A	A	D	B	B	B	A
21	22	23	24	25	26	27	28	29	30
A	B	B	C	A	B	D	D	A	B