NEET UG 2018 Chemistry Question paper with Answer

46. The correct order of N-compounds in its decreasing order of oxidation states is

(1) HNO₃, NH₄Cl, NO, N₂

(2) HNO₃, NO, NH₄Cl, N₂

(3) HNO₃, NO, N₂, NH₄Cl

(4) NH₄Cl, N₂, NO, HNO₃

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47. Which one of the following elements is unable to form MF₆^3– ion?

(1) B (2) Al

(3) Ga (4) In

48. Considering Ellingham diagram, which of the following metals can be used to reduce alumina?

(1) Mg (2) Zn

(3) Fe (4) Cu

49. The correct order of atomic radii in group 13 elements is

(1) B < Ga < Al < Tl < In

(2) B < Al < Ga < In < Tl

(3) B < Al < In < Ga < Tl

(4) B < Ga < Al < In < Tl

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50. Which of the following statements is not true for halogens?

(1) All but fluorine show positive oxidation states

(2) All are oxidizing agents

(3) All form monobasic oxyacids

(4) Chlorine has the highest electron-gain enthalpy

51. In the structure of ClF₃, the number of lone pair of electrons on central atom ‘Cl’ is

(1) Four (2) Two

(3) One (4) Three

52.

(a)

(b)

(c)

(d)

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54. Regarding cross-linked or network polymers, which of the following statements is incorrect?

(1) Examples are bakelite and melamine.

(2) They are formed from bi- and tri-functional monomers.

(3) They contain covalent bonds between various linear polymer chains.

(4) They contain strong covalents bonds in their polymer chains.

55. Nitration of aniline in strong acidic medium also gives m-nitroaniline because

(1) In absence of substituents nitro group always goes to m-position.

(2) In electrophilic substitution reactions amino group is meta directive.

(3) Inspite of substituents nitro group always goes to only m-position.

(4) In acidic (strong) medium aniline is present as anilinium ion.

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56. The difference between amylose and amylopectin is

(1) Amylopectin have 1 → 4 α-linkage and 1 → 6 β-linkage

(2) Amylose have 1 → 4 α-linkage and 1 → 6 β-linkage

(3) Amylopectin have 1 → 4 α-linkage and 1 → 6 α-linkage

(4) Amylose is made up of glucose and galactose

57. 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 g) of the remaining product at STP will be

(1) 2.8 (2) 3.0

(3) 1.4 (4) 4.4

58. Which of the following oxides is most acidic in nature?

(1) BaO (2) BeO

(3) MgO (4) CaO

59. Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and human activity?

(1) N₂O (2) NO₂

(3) N₂O₅ (4) NO

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60. 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

(1) C₂H₅Cl, C₂H₆, C₂H₅OH

(2) C₂H₅OH, C₂H₅Cl, C₂H₅ONa

(3) C₂H₅OH, C₂H₆, C₂H₅Cl

(4) C₂H₅OH, C₂H₅ONa, C₂H₅Cl

61.

(1) 3-bromo-2,4,6-trichlorotoluene

(2) o-bromotoluene

(3) m-bromotoluene

(4) p-bromotoluene

62. Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to gaseous hydrocarbon containing less than four carbon atoms. (A) is

(1) CH₃–CH₃ (2) CH₂=CH₂

(3) CH≡CH (4) CH₄

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63. Which of the following molecules represents the order of hybridisation sp², sp², sp, sp from left to right atoms?

(1) CH₂= CH – CH = CH₂

(2) CH₂= CH – C ≡ CH

(3) HC ≡ C – C ≡ CH

(4) CH₃– CH = CH – CH₃

64. Which of the following carbocations is expected to be most stable?

(a) (b)

65. Which of the following is correct with respect to – I effect of the substituents? (R = alkyl)

(1) – NH₂> – OR > – F

(2) – NR₂< – OR < – F

(3) – NH₂< – OR < – F

(4) – NR₂> – OR > – F

66.

(a)

(b)

(c)

(d)