You are currently viewing NEET 2020 – Chemistry Question Paper with Answers Keys

NEET 2020 – Chemistry Question Paper with Answers Keys

91. Identify a molecule which does not exist.

(1) He2                             (2) Li2

(3) C2                               (4) O2

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92. Find out the solubility of Ni(OH)2 in 0.1 M NaOH. Given that the ionic product of Ni(OH)2 is 2 × 10–15

(1) 2 × 10–13 M                          (2) 2 × 10–8 M

(3) 1 × 10–13 M                          (4) 1 × 108 M

93. Identify the correct statements from the following :

(a) CO2(g) is used as refrigerant for ice-cream and frozen food.

(b) The structure of C60 contains twelve six carbon rings and twenty five carbon rings.

(c) ZSM-5, a type of zeolite, is used to convert alcohols into gasoline.

(d) CO is colorless and odourless gas.


94. Hydrolysis of sucrose is given by the following reaction.

Sucrose + H2O ⇌ Glucose + Fructose

If the equilibrium constant (KC) is 2 × 1013 at 300 K, the value of Δr

G° at the same temperature will be :

(1) –8.314 J mol–1K–1 × 300 K × ln(2 × 1013)

(2) 8.314 J mol–1K–1 × 300 K × ln(2 × 1013)

(3) 8.314 J mol–1K–1 × 300 K × ln(3 × 1013)

(4) –8.314 J mol–1K–1 × 300 K × ln(4 × 1013)

95.

(a)                                  (b)

(c)                                  (d)

96. Identify the incorrect match. Name IUPAC Official Name

(a) Unnilunium      (i) Mendelevium

(b) Unniltrium       (ii) Lawrencium

(c) Unnilhexium    (iii) Seaborgium

(d) Unununnium    (iv) Darmstadtium

(1) (a), (i)              (2) (b), (ii)

(3) (c), (iii)            (4) (d), (iv)

97. An element has a body centered cubic (bcc) structure with a cell edge of 288 pm. The atomic radius is

(1) √3/4 x 288 pm                               (2) √2/4 x 288 pm

(3) 4/√3 x 288 pm                               (4) 4/√2 x 288 pm

98. Which of the following set of molecules will have zero dipole moment?

(1) Ammonia, beryllium difluoride, water, 1,4-dichlorobenzene

(2) Boron trifluoride, hydrogen fluoride, carbon dioxide, 1,3-dichlorobenzene

(3) Nitrogen trifluoride, beryllium difluoride, water, 1,3-dichlorobenzene

(4) Boron trifluoride, beryllium difluoride, carbon dioxide, 1,4-dichlorobenzene

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99. On electrolysis of dil. sulphuric acid using Platinum (Pt) electrode, the product obtained at anode will be

(1) Hydrogen gas                      (2) Oxygen gas

(3) H2S gas                                (4) SO2 gas

100. Reaction between acetone and methylmagnesium chloride followed by

hydrolysis will give :

(1) Isopropyl alcohol                 (2) Sec. butyl alcohol

(3) Tert. butyl alcohol                (4) Isobutyl alcohol

102. Which of the following amine will give the carbyle test?

(a)                               (b)

(c)                                 (d)


103. The calculated spin only magnetic moment of Cr2+ ion is

(1) 3.87 BM                               (2) 4.90 BM

(3) 5.92 BM                               (4) 2.84 BM

104. The correct option for free expansion of an ideal gas under adiabatic condition is

(1) q = 0, ΔT = 0 and w = 0                           (2) q = 0, ΔT < 0 and w > 0

(3) q < 0, ΔT = 0 and w = 0                           (4) q > 0, ΔT > 0 and w > 0

105. The freezing point depression constant (Kf) of benzene is 5.12 K kg mol–1. The freezing point depression for the solution of molality 0.078 m containing a non-electrolyte solute in benzene is (rounded off upto two decimal places) :

(1) 0.20 K

(2) 0.80 K

(3) 0.40 K

(4) 0.60 K

106. The number of Faradays(F) required to produce 20 g of calcium from molten CaCl2 (Atomic mass of Ca = 40 g mol–1) is

(1) 1                                (2) 2

(3) 3                                (4) 4

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107. Reaction between benzaldehyde and acetophenone in presence of dilute NaOH is known as

(1) Aldol condensation

(2) Cannizzaro’s reaction

(3) Cross Cannizzaro’s reaction

(4) Cross Aldol condensation

108. Paper chromatography is an example of

(1) Adsorption chromatography

(2) Partition chromatography

(3) Thin layer chromatography

(4) Column chromatography

109. An increase in the concentration of the reactants of a reaction leads to change in

(1) activation energy                            (2) heat of reaction

(3) threshold energy                            (4) collision frequency


110. A mixture of N2 and Ar gases in a cylinder contains 7 g of N2 and 8 g of Ar. If the total pressure of the mixture of the gases in the cylinder is 27 bar, the partial pressure of N2 is :

[Use atomic masses (in g mol–1) : N = 14, Ar = 40]

(1) 9 bar                          (2) 12 bar

(3) 15 bar                        (4) 18 bar

111. Identify the correct statement from the following :

(1) Wrought iron is impure iron with 4% carbon.

(2) Blister copper has blistered appearance due to evolution of CO2.

(3) Vapour phase refining is carried out for Nickel by Van Arkel method.

(4) Pig iron can be moulded into a variety of shapes.

112. A tertiary butyl carbocation is more stable than a secondary butyl carbocation because of ?

(1) – I effect of – CH3 groups

(2) + R effect of – CH3 groups

(3) – R effect of – CH3 groups

(4) Hyperconjugation

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113. Which of the following is a cationic detergent?

(1) Sodium lauryl sulphate

(2) Sodium stearate

(3) Cetyltrimethyl ammonium bromide

(4) Sodium dodecylbenzene sulphonate

114. Elimination reaction of 2-Bromo-pentane to form pent-2-ene is

(a) β -Elimination reaction

(b) Follows Zaitsev rule

(c) Dehydrohalogenation reaction

(d) Dehydration reaction

(1) (a), (b), (c)

(2) (a), (c), (d)

(3) (b), (c), (d)

(4) (a), (b), (d)

116. Which of the following is the correct order of increasing field strength of ligands to form coordination compounds?

(1) SCN < F < C2O42– < CN

(2) SCN < F < CN < C2O42–

(3) F < SCN < C2O42– < CN

(4) CN < C2O42– < SCN < F

117. Which of the following is a basic oacid ?

(1) Serine                                   (2) Alanine

(3) Tyrosine                               (4) Lysine

118. HCl was passed through a solution of CaCl2, MgCl2 and NaCl. compound(s) crystallise(s)?

(1) Both MgCl2 and CaCl2

(2) Only NaCl

(3) Only MgCl2

(4) NaCl, MgCl2 and CaCl2