2018 NEET Chemistry Solved Paper

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Previous Year Paper Chemistry - 2018
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Chemistry NEET 2018
Exam Year 2018
Study, Assignments, Solved Previous Year Papers .
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• Multiple Choice Questions
• Consider the change in oxidation state of Bromine
  corresponding to di?erent emf values as shown in
  the diagram below
• BrO4- ?1.82BrO3-?1.5 VHBrO?1.595Br2?1.0652 VBr-
• Then the species undergoing disproportionation is
• BrO3- BrO4- HBrO
• Br2 Answer
• Which one of the following conditions will favour
  maximum formation of the product in the reaction,
  A2 (g) B2 (g) ? X2 (g)?r H - XkJ?
• Low temperature and high pressure Low
  temperature and low pressure High temperature
  and low pressure High temperature and high
  pressure
• Answer
• The bond dissociation energies of X2, Y2 and XY
  are in the ratio of 1 0.5 1. ?H for the
  formation of XY is
• 200 kJ mol1. The bond dissociation energy of X2
  will be
• 200 kJ mol-1
• 100 kJ mol-1
• 400 kJ mol-1

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Chemistry NEET 2018
Exam Year 2018
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Total orbital angular momentum of electron in 's'
orbital is equal to zero An orbital is designated
by three quantum numbers while an electron in an
atom is designated by four quantum numbers The
value of m for dz2 is zero The electronic
con?guration of N atom is

• Answer
• Magnesium reacts with an element (X) to form an
  ionic compound. If the ground state electronic
• con?guration of (X) is 1s2 2s2 2p3, the simplest
  formula for this compound is Mg2X3
• MgX2 Mg3X2 Mg2X
• Answer
• In the structure of ClF3, the number of lone pair
  of electrons on central atom Cl is One
• Two
• Three Four
• Answer
• The correct order of atomic radii in group 13
  elements is B lt Al lt In lt Ga lt Tl
• B lt Al lt Ga lt In lt Tl B lt Ga lt Al lt In lt Tl B lt
  Ga lt Al lt Tl lt In
• Answer
• Which of the following oxides is most acidic in
  nature? MgO
• BeO CaO BaO
• Answer

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Chemistry NEET 2018
Exam Year 2018
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• Which oxide of nitrogen is not a common pollutant
  introduced into the atmosphere both due to
  natural and
• human activity?
• N2O5 NO2
• NO N2O
• Answer
• Which of the following molecules represents the
  order of hybridisation sp2, sp2, sp, sp from left
  to right atoms?
• HCC-CCH CH2CH-CCH
• CH3-CHCH-CH3 CH2CH-CHCH2
• Answer
• Which of the following is correct with respect to
  I e?ect of the substituents? (R alkyl)
• -NH2 lt- OR lt - F
• -NR2 lt- OR lt-F
• -NR2 gt-ORgt-F
• -NH2gt-ORgt-F
• Answer
• In which case is a number of molecules of water
  maximum? 18 mL of water
• 0.18 g of water
• 10-3 mol of water

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Chemistry NEET 2018
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15. For the redox reaction MnO4- C2O4-2 H ?
Mn2 CO2 H2O The correct coe?cients of the
reactants for the balanced equation are
H
MnO4-
C2O42-
16
5
2
H
- MnO4
2- C2O4
2
5
16
H
- MnO4
2- C2O4
5
16
2
H
- MnO4
2- C2O4
2
16
5

• Answer
• Which one of the following elements is unable to
  form MF6-3 ion? Ga
• Al In B
• Answer
• Considering the Ellingham diagram, which of the
  following metals can be used to reduce alumina?
  Fe
• Zn Cu Mg
• Answer
• Which of the following statements is not true for
  halogens? All form monobasic oxyacids

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Chemistry NEET 2018
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• All are oxidizing agents
• Chlorine has the highest electron-gain enthalpy
  All but ?uorine show positive oxidation states
• Answer
• A mixture of 2.3 g formic acid and 4.5 g oxalic
  acid is treated with conc. H2SO4. The evolved
  gaseous mixture is passed through KOH pellets.
  Weight (in gram) of the remaining product at STP
  will be
• 1.4
• 3.0
• 4.4
• 2.8
• Answer
• Match the metal ions given in Column I with the
  spin magnetic moments of the ions given in Column
  II and assign the correct code
• Column I Column II

Co3
a.
i.
8 BM
Cr3
b.
ii.
35 BM
Fe3
c.
iii.
3 BM
Ni2
d.
iv.
24 BM
v.
15 BM
a b c d iv v ii i a b c d i ii iii iv a b c d
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Chemistry NEET 2018
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• iii v i ii
• a b c d iv i ii iii
• Answer
• Which one of the following ions exhibits d-d
  transition and paramagnetism as well? CrO42-
• Cr2O72- MnO42- MnO4-
• Answer
• Iron carbonyl, Fe(CO)5 is
• Tetranuclear Mononuclear Dinuclear Trinuclear
• Answer
• The type of isomerism shown by the complex
  CoCl2(en)2 is Geometrical isomerism
• Coordination isomerism
• Linkage isomerism Ionization isomerism
• Answer
• The geometry and magnetic behaviour of the
  complex Ni(CO)4 are Square planar geometry and
  diamagnetic
• Tetrahedral geometry and diamagnetic
• Tetrahedral geometry and paramagnetic Square
  planar geometry and paramagnetic
• Answer
• Following solutions were prepared by mixing
  di?erent volumes of NaOH and HCl of di?erent
  concentrations

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Chemistry NEET 2018
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• aOHd) 100 mL M10 HCl 100 mLM10 NaOH
• pH of which one of them will be equal to 1?
• b a c d
• Answer
• On which of the following properties does the
  coagulating power of an ion depend? The
  magnitude of the charge on the ion alone
• Size of the ion alone
• The sign of the charge on the ion alone
• Both magnitude and sign of the charge on the ion
  Answer
• Given van der Waals constant for NH3, H2, O2 and
  CO2 are respectively 4.17, 0.244, 1.36 and 3.59,
  which one of the following gases is most easily
  lique?ed?
• NH3
• H2 CO2 O2
• Answer
• The solubility of BaSO in water is 2.42 103
  gL1 at 298 K. The value of its solubility
  product (K will be
• 4 sp)
• (Given the molar mass of BaSO 233 g mol1)
• 4

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Chemistry NEET 2018
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• The rate of a ?rst-order reaction does depend on
  reactant concentrations the rate of a
  second-order
• reaction does not depend on reactant
  concentrations
• A ?rst-order reaction can catalyzed a
  second-order reaction cannot be catalyzed Answer
• When initial concentration of the reactant is
  doubled, the half-life period of a zero order
  reaction Is halved
• Is doubled
• Remains unchanged Is tripled
• Answer
• Iron exhibits bcc structure at room temperature.
  Above 900C, it transforms to fcc structure. The
  ratio of density of iron at room temperature to
  that at 900C (assuming molar mass and atomic
  radii of iron remains constant with temperature)
  is
• 32
• 4332
• 1/2
• 3342
• Answer
• Consider the following species
• CN, CN, NO and CN
• Which one of these will have the highest bond
  order?
• NO

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Chemistry NEET 2018
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Answer 35. Which of the following compounds can
form a zwitter ion?
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Chemistry NEET 2018
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• Aniline
• Acetanilide Glycine Benzoic acid
• Answer
• Regarding cross-linked or network polymers, which
  of the following statements is incorrect? They
  contain covalent bonds between various linear
  polymer chains.
• They are formed from bi- and tri-functional
  monomers. They contain strong covalent bonds in
  their polymer chains. Examples are bakelite and
  melamine.
• Answer
• Nitration of aniline in strong acidic medium also
  gives m-nitroaniline because Inspite of
  substituents nitro group always goes to only
  m-position.
• In electrophilic substitution reactions amino
  group is meta directive. In acidic (strong)
  medium aniline is present as anilinium ion.
• In absence of substituents nitro group always
  goes to m-position.
• Answer
• The di?erence between amylose and amylopectin is
  Amylopectin have 1 ? 4 a-linkage and 1 ? 6
  a-linkage Amylose have 1 ? 4 a-linkage and 1 ? 6
  ß-linkage Amylose is made up of glucose and
  galactose Amylopectin have 1 ? 4 a-linkage and 1
  ? 6 ß-linkage
• Answer
• The compound A on treatment with Na gives B, and
  with PCl5 gives C. B and C react together to give
  diethyl ether. A, B and C are in the order
• C2H5OH, C2H6, C2H5Cl
• C2H5OH, C2H5Cl, C2H5ONa C2H5OH, C2H5ONa, C2H5Cl
  C2H5Cl, C2H6, C2H5OH
• Answer
• The compound C7H8 undergoes the following
  reactions C7H8 ?3Cl2/?A ?Br2/Fe B ?Zn/HCl C
• The product 'C' is

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Chemistry NEET 2018
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• o-bromotoluene
• p-bromotoluene
• 3-bromo-2,4,6-trichlorotoluene Answer
• Hydrocarbon (A) reacts with bromine by
  substitution to form an alkyl bromide which by
  Wurtz reaction is converted to a gaseous
  hydrocarbon containing less than four carbon
  atoms. (A) is
• CH CH H2C CH2
• CH4
• CH3-CH3
• Answer
• Which of the following carbocations is expected
  to be most stable?

Answer
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Chemistry NEET 2018
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43. In the reaction,

• The electrophile involved is
• Dichloromethyl cation (CHCl )
• 2
• Formyl cation (CHO) Dichlorocarbene (CCl2)
• Dichloromethyl anion (C-HCl )
• 2
• Answer
• Carboxylic acids have higher boiling points than
  aldehydes, ketones and even alcohols of
  comparable molecular mass. It is due to their
• Formation of intramolecular H-bonding Formation
  of intermolecular H-bonding Formation of
  intermolecular H-bonding
• More extensive association of carboxylic acid via
  Vander Waals force of attraction Answer
• Compound A, C8H10O, is found to react with NaOI
  (produced by reacting Y with NaOH) and yields a
  yellow precipitate with characteristic smell. A
  and Y are respectively

Answer
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