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

Chemistry Notes

Physics Notes

Biology Notes

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

Chemistry Notes

Physics Notes

Biology Notes

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