NEET 2020 Chemistry Questions with Solutions

1. AOption A: He₂
2. BOption B: Li₂
3. COption C: C₂
4. DOption D: O₂

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1. AOption A: 2 × 10⁻¹³ M
2. BOption B: 2 × 10⁻⁸ M
3. COption C: 1 × 10⁻¹³ M
4. DOption D: 1 × 10⁸ M

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1. AOption A: (a), (b) and (c) only
2. BOption B: (a) and (c) only
3. COption C: (b) and (c) only
4. DOption D: (c) and (d) only

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1. AOption A: -8.314 J mol⁻¹ K⁻¹ × 300 K × ln(2 × 10¹³)
2. BOption B: 8.314 J mol⁻¹ K⁻¹ × 300 K × ln(2 × 10¹³)
3. COption C: 8.314 J mol⁻¹ K⁻¹ × 300 K × ln(3 × 10¹³)
4. DOption D: -8.314 J mol⁻¹ K⁻¹ × 300 K × ln(4 × 10¹³)

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1. AOption A: Option (1)
2. BOption B: Option (2)
3. COption C: Option (3)
4. DOption D: Option (4)

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1. AOption A: (a), (i)
2. BOption B: (b), (ii)
3. COption C: (c), (iii)
4. DOption D: (d), (iv)

1. AOption A: $\frac{\sqrt{3}}{4} \times 288\ \text{pm}$
2. BOption B: $\frac{\sqrt{2}}{4} \times 288\ \text{pm}$
3. COption C: $\frac{4}{\sqrt{3}} \times 288\ \text{pm}$
4. DOption D: $\frac{4}{\sqrt{2}} \times 288\ \text{pm}$

1. AOption A: Ammonia, beryllium difluoride, water, 1,4-dichlorobenzene
2. BOption B: Boron trifluoride, hydrogen fluoride, carbon dioxide, 1,3-dichlorobenzene
3. COption C: Nitrogen trifluoride, beryllium difluoride, water, 1,3-dichlorobenzene
4. DOption D: Boron trifluoride, beryllium difluoride, carbon dioxide, 1,4-dichlorobenzene

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1. AOption A: Hydrogen gas
2. BOption B: Oxygen gas
3. COption C: H$_2$S gas
4. DOption D: SO$_2$ gas

1. AOption A: Isopropyl alcohol
2. BOption B: Secondary butyl alcohol
3. COption C: Tertiary butyl alcohol
4. DOption D: Isobutyl alcohol

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1. AOption A: H₂SO₃, sulphurous acid
2. BOption B: H₂SO₄, sulphuric acid
3. COption C: H₂S₂O₈, peroxodisulphuric acid
4. DOption D: H₂S₂O₇, pyrosulphuric acid

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1. AOption A: Option (1)
2. BOption B: Option (2)
3. COption C: Option (3)
4. DOption D: Option (4)

1. AOption A: 3.87 BM
2. BOption B: 4.90 BM
3. COption C: 5.92 BM
4. DOption D: 2.84 BM

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1. AOption A: q = 0, ΔT = 0 and w = 0
2. BOption B: q = 0, ΔT < 0 and w > 0
3. COption C: q < 0, ΔT = 0 and w = 0
4. DOption D: q > 0, ΔT > 0 and w > 0

1. AOption A: 0.20 K
2. BOption B: 0.80 K
3. COption C: 0.40 K
4. DOption D: 0.60 K

1. AOption A: 1
2. BOption B: 2
3. COption C: 3
4. DOption D: 4

1. AOption A: Aldol condensation
2. BOption B: Cannizzaro’s reaction
3. COption C: Cross Cannizzaro’s reaction
4. DOption D: Cross Aldol condensation

1. AOption A: Adsorption chromatography
2. BOption B: Partition chromatography
3. COption C: Thin layer chromatography
4. DOption D: Column chromatography

1. AOption A: Activation energy
2. BOption B: Heat of reaction
3. COption C: Threshold energy
4. DOption D: Collision frequency

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1. AOption A: 9 bar
2. BOption B: 12 bar
3. COption C: 15 bar
4. DOption D: 18 bar

1. AOption A: (1) Wrought iron is impure iron with 4% carbon.
2. BOption B: (2) Blister copper has blistered appearance due to evolution of CO₂.
3. COption C: (3) Vapour phase refining is carried out for Nickel by Van Arkel method.
4. DOption D: (4) Pig iron can be moulded into a variety of shapes.

1. AOption A: (1) – I effect of – CH₃ groups
2. BOption B: (2) + R effect of – CH₃ groups
3. COption C: (3) – R effect of – CH₃ groups
4. DOption D: (4) Hyperconjugation

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1. AOption A: (1) Sodium lauryl sulphate
2. BOption B: (2) Sodium stearate
3. COption C: (3) Cetyltrimethyl ammonium bromide
4. DOption D: (4) Sodium dodecylbenzene sulphonate

1. AOption A: (1) (a), (b), (c)
2. BOption B: (2) (a), (c), (d)
3. COption C: (3) (b), (c), (d)
4. DOption D: (4) (a), (b), (d)

1. AOption A: (1) Ethanol + Acetone
2. BOption B: (2) Benzene + Toluene
3. COption C: (3) Acetone + Chloroform
4. DOption D: (4) Chloroethane + Bromoethane

1. AOption A: (1) SCN⁻ < F⁻ < C₂O₄²⁻ < CN⁻
2. BOption B: (2) SCN⁻ < F⁻ < CN⁻ < C₂O₄²⁻
3. COption C: (3) F⁻ < SCN⁻ < C₂O₄²⁻ < CN⁻
4. DOption D: (4) CN⁻ < C₂O₄²⁻ < SCN⁻ < F⁻

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1. AOption A: (1) Serine
2. BOption B: (2) Alanine
3. COption C: (3) Tyrosine
4. DOption D: (4) Lysine

1. AOption A: (1) Both MgCl₂ and CaCl₂
2. BOption B: (2) Only NaCl
3. COption C: (3) Only MgCl₂
4. DOption D: (4) NaCl, MgCl₂ and CaCl₂

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1. AOption A: (1) cis-1,4-polyisoprene
2. BOption B: (2) poly (Butadiene-styrene)
3. COption C: (3) polybutadiene
4. DOption D: (4) poly (Butadiene-acrylonitrile)

1. AOption A: (1) It forms carboxyhaemoglobin
2. BOption B: (2) It reduces oxygen carrying ability of blood.
3. COption C: (3) The carboxyhaemoglobin (haemoglobin bound to CO) is less stable than oxyhaemoglobin.
4. DOption D: (4) It is produced due to incomplete combustion.

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1. AOption A: β-D-Glucose + α-D-Fructose
2. BOption B: α-D-Glucose + β-D-Glucose
3. COption C: α-D-Glucose + β-D-Fructose
4. DOption D: α-D-Fructose + β-D-Fructose

1. AOption A: Iron
2. BOption B: Copper
3. COption C: Calcium
4. DOption D: Potassium

1. AOption A: 1 g of Ag(s) [Atomic mass of Ag = 108]
2. BOption B: 1 g of Mg(s) [Atomic mass of Mg = 24]
3. COption C: 1 g of $O_2(g)$ [Atomic mass of O = 16]
4. DOption D: 1 g of Li(s) [Atomic mass of Li = 7]

1. AOption A: 71, 104 and 71
2. BOption B: 104, 71 and 71
3. COption C: 71, 71 and 104
4. DOption D: 175, 104 and 71

1. AOption A: $+4$ to $+4$
2. BOption B: $0$ to $+4$
3. COption C: $-4$ to $+4$
4. DOption D: $0$ to $-4$

1. AOption A: Cr²⁺ (d⁴) is a stronger reducing agent than Fe²⁺ (d⁶) in water.
2. BOption B: The transition metals and their compounds are known for their catalytic activity due to their ability to adopt multiple oxidation states and to form complexes.
3. COption C: Interstitial compounds are those that are formed when small atoms like H, C or N are trapped inside the crystal lattices of metals.
4. DOption D: The oxidation states of chromium in CrO₄²⁻ and Cr₂O₇²⁻ are not the same.

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1. AOption A: $\Delta_r H > 0$ and $\Delta_r S > 0$
2. BOption B: $\Delta_r H > 0$ and $\Delta_r S < 0$
3. COption C: $\Delta_r H < 0$ and $\Delta_r S > 0$
4. DOption D: $\Delta_r H < 0$ and $\Delta_r S < 0$

1. AOption A: Viscosity
2. BOption B: Solubility
3. COption C: Stability of the colloidal particles
4. DOption D: Size of the colloidal particles

1. AOption A: CuSO₄
2. BOption B: [Cu(NH₃)₄]²⁺
3. COption C: Cu(OH)₂
4. DOption D: CuCO₃·Cu(OH)₂

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1. AOption A: (a) (iii) (b) (i) (c) (ii) (d) (iv)
2. BOption B: (a) (iii) (b) (ii) (c) (i) (d) (iv)
3. COption C: (a) (iii) (b) (iv) (c) (ii) (d) (i)
4. DOption D: (a) (i) (b) (iii) (c) (ii) (d) (iv)

1. AOption A: (a) (i) (b) (ii) (c) (iii) (d) (iv)
2. BOption B: (a) (ii) (b) (i) (c) (iv) (d) (iii)
3. COption C: (a) (iii) (b) (iv) (c) (i) (d) (ii)
4. DOption D: (a) (iv) (b) (iii) (c) (ii) (d) (i)

1. AOption A: 100 s
2. BOption B: 200 s
3. COption C: 500 s
4. DOption D: 1000 s

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1. AOption A: Option (1)
2. BOption B: Option (2)
3. COption C: Option (3)
4. DOption D: Option (4)

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1. AOption A: n-Hexane
2. BOption B: 2,3-Dimethylbutane
3. COption C: n-Heptane
4. DOption D: n-Butane

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1. AOption A: Option (1)
2. BOption B: Option (2)
3. COption C: Option (3)
4. DOption D: Option (4)

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