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Delhi University Entrance Test (DUET) 2020 Previous Year Question Paper With Answer Key

This post was last modified on 27 December 2020

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DUET Last 10 Years 2011-2021 Question Papers With Answer Key || Delhi University Entrance Test conducted by the NTA

Topic: - CHEM MSC S2

The oxo-acid of phosphorus having P-atoms in +4, +3, and + 4 oxidation states respectively, is [Question ID = 9737]
1. H5P3O10 [Option ID = 38942]
2. H5P3O7 [Option ID = 38944]
3. H5P3O8 [Option ID = 38946]
4. H5P3O9 [Option ID = 38948]
Correct Answer :-

• H5P3O8 [Option ID = 38946]

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According to Wade's theory the anion [B12H12]2- adopts [Question ID = 9740]
1. closo-structure [Option ID = 38951]
2. arachno-structure [Option ID = 38953]
3. hypo- structure [Option ID = 38955]
4. nido- structure [Option ID = 38957]
Correct Answer :-
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• closo-structure [Option ID = 38951]
Which one of the following species has the magnetic moment value of 3.87 BM? [Question ID = 9741]
1. Fe3+ [Option ID = 38958]
2. Cr2+ [Option ID = 38960]
3. Co2+ [Option ID = 38962]
4. Au³+ [Option ID = 38964]
Correct Answer :-

• Co2+ [Option ID = 38962]
Which of the following complexes does not show optical activity? [Question ID = 9743]
1. [Co(EDTA)] [Option ID = 38966]
2. [Pt(bn)2]2+ [Option ID = 38968]
3. [Pt(pn)2]2+ [Option ID = 38970]
4. [Pt(en)2]2+ [Option ID = 38972]
Correct Answer :-

• [Pt(en)2]2+ [Option ID = 38972]
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The expected H-H-H bond angle in [H3]+ [Question ID = 9745]
1. 180° [Option ID = 38974]
2. 120° [Option ID = 38976]
3. 60° [Option ID = 38978]
4. 90° [Option ID = 38980]
Correct Answer :-

• 60° [Option ID = 38978]
The metallic radii are abnormally high for which of the following pairs? [Question ID = 9747]
1. Eu, Yb [Option ID = 38982]
2. Sm, Tm [Option ID = 38984]
3. Gd, Lu [Option ID = 38986]
4. Nd, Ho [Option ID = 38988]
Correct Answer :-

• Eu, Yb [Option ID = 38982]

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The least basic among the following is [Question ID = 9750]
1. Al(OH)3 [Option ID = 38991]
2. La(OH)3 [Option ID = 38993]
3. Ce(OH)3 [Option ID = 38995]
4. Lu(OH)3 [Option ID = 38997]

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According to VSEPR theory, the molecule is [Question ID = 9751]
1. SO42- [Option ID = 38998]
2. SF4 [Option ID = 39000]
3. S2Cl2 [Option ID = 39003]
4. SO2Cl2 [Option ID = 39005]
Correct Answer :-
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• SO42- [Option ID = 38998]
According to MO theory, for the diatomic species, C2 [Question ID = 9754]
1. Bond order is zero and it is diamagnetic [Option ID = 39007]
2. Bond order is two and it is paramagnetic [Option ID = 39009]
3. Bond order is two and it is diamagnetic [Option ID = 39011]
4. Bond order is zero and it is paramagnetic [Option ID = 39013]
Correct Answer :-

• Bond order is two and it is diamagnetic [Option ID = 39011]
The number of microstates present in 3F term is [Question ID = 9755]
1. 3 [Option ID = 39014]
2. 21 [Option ID = 39016]
3. 9 [Option ID = 39018]
4. 28 [Option ID = 39020]
Correct Answer :-

• 21 [Option ID = 39016]
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Consider the following statements:
According the Werner's theory

A. Ligands are connected to the metal ions by covalent bonds

B. Secondary valence is have directional properties

C. Secondary valences are non-ionisable of these statements
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Choose the correct answer from the options given below:
[Question ID = 9757]
1. A, B and C only [Option ID = 39022]
2. B and C only [Option ID = 39024]
3. A and C only [Option ID = 39026]
4. A and B only [Option ID = 39028]
Correct Answer :-

• B and C only [Option ID = 39024]
Among the following, the correct order of acidity is? [Question ID = 9760]
1. HCIO < HCIO2 < HCIO3 < HCLO4 [Option ID = 39031]
2. HCIO4 < HCIO3 < HCIO2 < HCIO [Option ID = 39033]
3. HCIO < HCIO4 < HCIO3 < HCIO2 [Option ID = 39035]
4. HCIO2 < HCIO2 < HCIO < HCLO4 [Option ID = 39036]
Correct Answer :-

• HCIO < HCIO2 < HCIO3 < HCIO4

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Which of the following nonaqueous solvents has the longest liquid range? [Question ID = 9761]
1. H2SO4 [Option ID = 39038]
2. N2O4 [Option ID = 39040]
3. NH3 [Option ID = 39042]
4. HCl [Option ID = 39044]
Correct Answer :-
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• H2SO4 [Option ID = 39038]
The following compounds are Pd (C6H5)2(SCN)2] and [Pd (C6H5)2(NCS)2] [Question ID = 9764]
1. Linkage isomers [Option ID = 39046]
2. Co-ordination isomers [Option ID = 39047]
3. Ionization isomers [Option ID = 39049]
4. Geometrical isomers [Option ID = 39051]
Correct Answer :-

• Linkage isomers [Option ID = 39046]
Which of the following elements found in native state [Question ID = 9765]
1. Al [Option ID = 39054]
2. Au [Option ID = 39055]
3. Cu [Option ID = 39056]
4. Na [Option ID = 39058]
Correct Answer :-

• Au [Option ID = 39055]
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Element with outer electronic configuration ns2 np6 are [Question ID = 9768]
1. Alkaline earth metals [Option ID = 39063]
2. Transition elements [Option ID = 39065]
3. Chalcogens [Option ID = 39067]
4. Noble gases [Option ID = 39069]
Correct Answer :-

• Noble gases [Option ID = 39069]
Which one of the following elements is least likely to participate in a hydrogen bond? [Question ID = 9769]
1. O [Option ID = 39070]
2. S [Option ID = 39073]
3. F [Option ID = 39075]
4. N [Option ID = 39077]
Correct Answer :-

• S [Option ID = 39073]

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Which one of the following terms describes a positive and negative charge, which are separated in space within a molecule? [Question ID = 9771]
1. Salt bridge [Option ID = 39078]
2. Polar bond [Option ID = 39080]
3. Dipole [Option ID = 39082]
4. Van der Waals interaction [Option ID = 39084]
Correct Answer :-
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• Dipole [Option ID = 39082]
Choose the correct lattice energy order [Question ID = 9773]
1. LiH < NaH < KH [Option ID = 39086]
2. MgH2 > CaH2 < SrH2 [Option ID = 39088]
3. MgH2 > CaH2 > SrH2 [Option ID = 39090]
4. LiH< NaH > KH
XeF2 is isostructural with [Question ID = 9775]
1. ICl2 [Option ID = 39094]
2. SbCl3 [Option ID = 39096]
3. BaCl2 [Option ID = 39099]
4. TeF2 [Option ID = 39101]
Correct Answer :-

• ICl2 [Option ID = 39094]
The pair of species that has the same bond order in the following is [Question ID = 9778]
1. O2, B2 [Option ID = 39103]
2. CO, NO+ [Option ID = 39105]
3. O2, N2 [Option ID = 39107]
4. NO, CN [Option ID = 39109]
Correct Answer :-

• CO, NO+ [Option ID = 39105]
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Total orbital angular momentum of np' electronic system is (a.u.) [Question ID = 9779]
1. 0 [Option ID = 39110]
2. 1 [Option ID = 39112]
3. 2 [Option ID = 39113]
4. 1/2 [Option ID = 39115]
Correct Answer :-

• 1 [Option ID = 39112]
The process of heating the concentrated ore in a limited supply of air or in the absence of air is known as [Question ID = 9782]
1. Roasting [Option ID = 39119]
2. Leaching [Option ID = 39120]
3. Calcination [Option ID = 39122]
4. Cupellation [Option ID = 39124]
Correct Answer :-

• Calcination [Option ID = 39122]

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Bond order of He molecule is [Question ID = 9783]
1. 2 [Option ID = 39126]
2. 1/2 [Option ID = 39128]
3. 1 [Option ID = 39130]
4. 0 [Option ID = 39132]
Correct Answer :-
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• 0 [Option ID = 39132]
Which of the following structures represents the conjugate acid of H?42- [Question ID = 9786]
1. H2PO4 [Option ID = 39135]
2. H3PO4 [Option ID = 39137]
3. H4PO4+ [Option ID = 39139]
4. PO43 [Option ID = 39141]
Correct Answer :-

• H2PO4 [Option ID = 39135]
(NH4)2Cr2O7 On heating gives a gas which is also given by [Question ID = 9787]
1. heating NH4NO2 [Option ID = 39142]
2. heating NII4NO3 [Option ID 39144]
3. Mg3N2 + H2O [Option ID = 39146]
4. Na (comp.) + H2O2 [Option ID = 39148]
All metals form oxides of the type MO except [Question ID = 9790]
1. Copper [Option ID = 39151]
2. Barium [Option ID = 39153]
3. Silver [Option ID = 39155]
4. Lead [Option ID = 39157]
Correct Answer :-

• Silver [Option ID = 39155]
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Which of the following represents the order of the extent of intensity of scattering of X-rays from the ions Na+, Li+, Cl-, Br: [Question ID = 9791]
1. Li+ < Na+ < Cl- < Br- [Option ID = 39158]
2. Br < Cl- < Na+ < Li+ [Option ID = 39160]
3. Na+ < Li+ < Br < Cl- [Option ID = 39162]
4. Li+ < Cl < Na+ < Br [Option ID = 39164]
Correct Answer :-

• Li+ < Na+ < Cl < Br [Option ID = 39158]
Which ordering correctly shows the variation in rates of water exchange in high-spin aqua complexes [M(OH2)6]n+? [Question ID = 9794]
1. Cr3+ > Fe3+ [Option ID = 39167]
2. Cr2+ > Cr3+ [Option ID = 39169]
3. Co2+ > Cr2+ [Option ID = 39171]
4. V2+ > Co2+ [Option ID = 39172]
Correct Answer :-

• Cr2+ > Cr3+ [Option ID = 39169]

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Which ordering correctly describes the tendency of a ligand to direct ligand substitution in a square planar complex to a position opposite to itself? [Question ID = 9795]
1. [CN] > Br > NH3 > [NO2] [Option ID = 39174]
2. [CN] > [NO2] > Br¯ > NH3 [Option ID = 39176]
3. Br > [CN] > NH3 > [NO2] [Option ID = 39178]
4. [NO2] > [CN] > NH3 > Br [Option ID = 39180]
Correct Answer :-
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• [CN] > [NO2] > Br¯ > NH3 [Option ID = 39176]
Identify the wrong statement in the following [Question ID = 9798]
1. Atomic radius of the elements increases as one moves down the first group of the periodic table [Option ID = 39183]
2. Atomic radius of the elements decreases as one moves across from left to right in the 2nd period of the periodic table [Option ID = 39185]
3. Amongst isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius [Option ID = 39187]
4. Amongst isoelectronic species, larger the negative charge on the anion, larger is the ionic radius [Option ID = 39189]
Rare gases are [Question ID = 9799]
1. mono atomic [Option ID = 39190]
2. di atomic [Option ID = 39191]
3. tri atomic [Option ID = 39193]
4. All of these [Option ID = 39196]
Correct Answer :-

• mono atomic [Option ID = 39190]
Who proposed first atomic theory? [Question ID = 9801]
1. E. Rutherford [Option ID = 39198]
2. De Broglie [Option ID = 39199]
3. John Dalton [Option ID = 39200]
4. D.I. Mendeleev [Option ID = 39201]
Correct Answer

• John Dalton [Option ID = 39200]
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Which one of the following is the softest? [Question ID = 9802]
1. sodium [Option ID = 39202]
2. iron [Option ID = 39203]
3. aluminium [Option ID = 39204]
4. lithium [Option ID = 39205]
Correct Answer :-

• sodium [Option ID = 39202]
In a mixture of the five proteins listed below, which should elute second in size-exclusion (gel-filtration) chromatography?
A. cytochrome c Mr = 13,000

B. immunoglobulin G Mr = 145,000
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C. ribonuclease A M1 = 13,700

D. RNA polymerase Mr = 450,000

E. serum albumin Mr = 68,500

Choose the correct answer from the options given below:
[Question ID = 9803]
1. A and B only [Option ID = 39206]
2. B only [Option ID = 39207]
3. C and E only [Option ID = 39208]
4. A and D only [Option ID = 39209]
Correct Answer :-

• B only [Option ID = 39207]
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What is X in the following conversion?
OH

H+
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[Question ID = 9804]
1. [Option ID = 39210]
2. [Option ID = 39211]
3. [Option ID = 39212]
4. 0 [Option ID = 39213]
Correct Answer :-

• [Option ID = 39212]
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The correct order of reactivity of p-halo nitrobenzene in the following reaction is
X

NO2 NaOMe

X= F, Cl, Br, I

MeO
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NO2
[Question ID = 9805]
1. p-chloronitrobenzene> p-iodonitrobenzene>p-fluoronitrobenzene>p-bromonitrobenzene [Option ID = 39214]
2. p-fluoronitrobenzene > p-chloronitrobenzene > p-bromonitrobenzene > p-iodonitrobenzene [Option ID = 39215]
3. p-iodonitrobenzene > p-bromonitrobenzene > p-chloronitrobenzene > p-fluoronitrobenzene [Option ID = 39216]
4. p-bromonitrobenzene > p-fluoronitrobenzene > p-iodonitrobenzene > p-chloronitrobenzene [Option ID = 39217]
Correct Answer :-

• p-fluoronitrobenzene > p-chloronitrobenzene > p-bromonitrobenzene > p-iodonitrobenzene [Option ID = 39215]
What is the relationship between the two structures shown?
CI

Me
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Me

CI
[Question ID = 9806]
1. Constitutional isomer [Option ID = 39218]
2. Stereoisomers [Option ID = 39219]
3. Different drawing of the same conformation of the same compound [Option ID = 39220]
4. Different conformation of the same compound [Option ID = 39221]
Correct Answer :-

• Constitutional isomer [Option ID = 39218]
The number of possible stereoisomer's obtained in the following reaction is
Me
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1. O3, Zn
2. excess PhMgBr
3. H3O+
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[Question ID = 9804]
1. 4 [Option ID = 39222]
2. 6 [Option ID = 39223]
3. 8 [Option ID = 39224]
4. 10 [Option ID = 39225]
Correct Answer :-

• 8 [Option ID = 39224]
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Identify P for the below mentioned reaction
1. CH3l

N(C2H5)2

P

2. NaHCO3, MeOH
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warm
[Question ID = 9808]
1. H3C. [Option ID = 39226]
  N(C2H5)2
2. OCH3 [Option ID = 39227]
  N(C2H5)2
3. [Option ID = 39228]
  CH2
4. [Option ID = 39229]
  C2H5
  
  N
  
  Me
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Correct Answer :-

CH2

[Option ID = 39228]

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The major product M and N formed in the following reactions are
CH2N2

N

CH3I/NaOH

M

OH
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[Question ID = 9809]
1. Me
  
  M =
  
  N
  
  OH
  
  N =
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  N
  
  OCH3
  [Option ID = 39230]
2. M =
  
  N
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  OCH3
  
  N =
  
  N
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3. Me
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  M =
  
  N
  
  N =
  
  N
  
  OCH3
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  [Option ID = 39232]
4. Me
  
  M =
  
  N =
  
  N
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  OH
  [Option ID = 39233]
Correct Answer :-

M =

N =
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N

OCH3

[Option ID = 39232]
When (R)-cyclohex-2-en-1-ol is treated with acid below gives
OH
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m-CPBA
[Question ID = 9810]
1. OH
  [Option ID = 39234]
2. OH
  [Option ID = 39235]
3. OH
  [Option ID = 39236]
4. None of these [Option ID = 39237]
Correct Answer :-

OH
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[Option ID = 39235]
The intermediate formed in the below reaction is
F

+

Br
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Mg

THF
[Question ID = 9811]
1. Grignard reagent forms dihalobenzene, adds to anthracene with displacement of fluorides anions to forms the product [Option ID = 39238]
2. Mg reduces anthracene to a reactive dianion that bonds to the dihalobenzene [Option ID = 39239]
3. A
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This post was last modified on 27 December 2020