दोस्तों यहां पर JEE Main 2021 20th July Shift 1 Chemistry का Solved Paper दिया गया है तथा आपको JEE Main का ऑनलाइन टेस्ट भी इस वेबसाइट पर दिया गया है।
| Section A |
31. Which one of the following complexes is violet in colour?
(1) [Fe(CN)₅NOS]4-
(2) Fe₄ [Fe(CN)₆]₃ H₂O
(3) (Fe(SCN)₆]4-
(4) [Fe(CN)₆]4-
32. The major product formed in the following reaction is:
33. The correct sequential addition of reagents in the preparation of 3-nitrobenzoic acid from benzene is :
(1) Br₂/AlBr₃, NaCN, H₃O+, HNO₃/H₂SO₄
(2) HN₃/H₂SO₄ , Br₂,/AlBr₃, Mg/ether, CO₂, H₃O+
(3) Br₂/AlBr₃, HNO₃/H₂SO₄ , Mg/ether, CO₂, H₃O+
(4) Br₂/AIBr₃, HNO₃/H₂SO₄ , NaCN, H₃O+
34. Given below are two statements :
Statements I : Frenkel defects are vacancy as well as interstitial defects.
Statements II : Frenkel defect leads of colour in ionic solids due to presence of F-centers. Choose the most appropriate answer for the statements from the options given below :
(1) Statement I is false but statements II is true.
(2) Both Statement I and statements II are true.
(3) Both Statement I and statements II are false.
(4) Statement I is true but statements II is false.
35. Excess of isobutane on reactions with Br, in
presence of light at 125°C gives which one of the following, as the major product ?
36. Given below are two statements.
Statements I : The choice of reducing agents for metal extraction can be made by using Ellingham diagram, a plot of ΔG vs temperature.
Statements II : The value of ΔS increases from left to right in Ellingham diagram. In the light of above statements, choose the most appropriate from the options given below:
(1) Both Statement I and statements II are false.
(2) Both Statement I and statements II are true.
(3) Statement I is false but statements II is true.
(4) Statement I is true but statements II is false.
37. What are the products formed in sequence when excess of CO₂ is passed in slaked lime ?
(1) CaCO₃, Ca(HCO₃)₂
(2) Ca(HCO₃)₂, CaCO₃
(3) CaO, CaCO₃
(4) CaO, Ca(HCO₃)2
38. The polymer formed on heating Novolac with formaldehyde is :
(1) Polyester
(2) Melamine
(3) Nylon 6, 6
(4) Bakelite
39. The incorrect statements is :
(1) F₂ is stronger oxidizing agent than Cl₂ in aqueous solution.
(2) Cl₂ is more reactive than ClF.
(3) On hydrolysis ClF forms HOCl and HF.
(4) F₂ is more reactive than ClF.
40. The major product formed in the following reactions is :
41. Which one of the following methods is most suitable for preparing deionized water ?
(1) Calgon’s method
(2) Clark’s method
(3) Synthetic resin method
(4) Permutit method
42. Which one of the following when dissolved in water gives coloured solution in nitrogen atmosphere ?
(1) AgCl
(2) CuCl₂
(3) Cu₂Cl₂
(4) ZnCl₂
43. Among the following compounds I-IV, which one forms a yellow precipitate on reacting sequentially with (i) NaOH (ii) dil. HNO₃ (iii) AgNO₃ ?
(1) III
(2) IV
(3) II
(4) I
44. Given below are two statements :
Statements I: In the titration between strong acid and weak base methyl orange is suitable as an indicator.
Statement II : For titration of acetic acid with NaOH, phenolphthalein is not a suitable indicator. In the light of the above statements, choose the most appropriate answer from the options given below :
(1) Statement I is true but statements II is false.
(2) Both Statement I and statements II are false.
(3) Statement I is false but statements II is true.
(4) Both Statement I and statements II are true.
45. Which one of the following is correct for the adsorption of a gas at a given temperature on a solid surface ?
(1) ΔH < 0, ΔS > 0
(2) ΔH > 0, ΔS < 0
(3) ΔH<0, ΔS < 0
(4) ΔH > 0, ΔS > 0
46. Given below are two statements :
Statements I: The limiting molar conductivity of KCI (strong electrolyte) is higher compared to that of CH3COOH (weak electrolyte).
Statement II : Molar conductivity decreases with decrease in concentration of electrolyte. In the light of the above statements, choose the most appropriate answer from the options given below :
(1) Statement I is false but statements II is true.
(2) Both Statement I and statements II are true.
(3) Both Statement I and statements II are false.
(4) Statement I is true but statements II is false.
47. Given below are two statements :
Statements I : According to Bohr’s model of an atom, qualitatively the magnitude of velocity of electron increases with decre ase in positive charges on the nucleus as there is no strong hold on the electron by the nucleus.
Statement II : According to Bohr’s model of an atom, qualitatively the magnitude of velocity of electron increases with decrease in principal quantum number. In the light of the above statements, choose the most appropriate answer from the options given below :
(1) Both Statement I and statements II are false.
(2) Both Statement I and statements II are true.
(3) Statement I is true but statements II is false.
(4) Statement I is false but statements II is true.
48. The correct options for the products A and B of the following reactions are :
49. The major products formed in the following reaction sequence A and B are :
50. The conversion of hydroxyapatite occur due to presence of Fions in water. The correct formula of hydroxyapatite is :
(1) [3Ca₃(PO₄)2:CaF₂]
(2) [Ca₃(PO₄)2:CaF₂]
(3) [3Ca(OH)₂-CaF2]
(4) [3Ca₃(PO₄)₂ Ca(OH)₂]
| Section B |
51. Of the following four aqueous solutions, total number of those solutions whose freezing points is lower than that of 0.10 M C2H₅OH is______ (Integer answer)
(1) 0.10 M Ba₃(PO₄)₂
(2) 0.10 M Na₂2SO₄
(3) 0.10 M KCI
(4) 0.10 M Li₃PO₄
52. The following data was obtained for chemical reaction given below at 975 K. 2NO(g) + 2H₂(g)→N₂(g) +2H₂O(g)
[NO] [H2] Rate
Mol L–¹ Mol L–¹ Mol L–¹ s–¹
(1) 8 x 10–⁵ 8 x 10–⁵ 7 x 10–⁹
(2) 24 x 10–⁵ 8 x 10–⁵ 2.1 x 10–⁸
(3) 24 x 10–⁵ 32 x 10–⁵ 8.4 x 10–⁸
The order of the reaction with respect to NO is _____ (Integer answer)
53. The Born-Haber cycle for KCl is evaluated with the following data :
ΔH°ƒ for KCl = 436.7 kJ mol–¹
ΔH°ƒ for K = 89.2 kJ mol–¹
ΔH° ionization for K = 419.0 kJ mol–¹
ΔH ionization for Cl(g) = -348.6 kJ mol–¹
ΔH bond for Cl₂ = 243.0 kJ mol–¹
The magnitude of lattice enthalpy of KCl in kJ mol–¹ is . (Nearest integer)
54. The number of 4f electrons in the ground state electronic configuration Gd²+ is (Atomic number of Gd = 64)
55. The ratio of number of water molecules in Mohr’s salt and potash alum is _____ 10–¹
56. These are physical properties of an elements.
(1) Sublimation enthalpy
(2) Ionisation enthalpy
(3) Hydration enthalpy
(4) Electron gain enthalpy
The total number of above properties that affect the reduction potential is _________ (Integer answer)
57. AB₃ is an interhalogen T-shaped molecule. The number of lone pairs of electrons on A is ______(Integer answer)
58. The total number of negative charge in the tetrapeptide, Gly-Glu-Asp-Tyr at pH 12.5 will be _____ (Integer answers)
59. An aqueous KCl solution of density 1.20 g mL–¹ has a molality of 3.30 mol kg–¹. The molarity of the solution in mol L–¹ is_____
(Nearest integer)
60. The OH– concentration in a mixture of 5.0 mL of 0.0504 M NH₄Cl and 2 mL of 0.0210 M NH₃ solution is x x 10–⁶M. The value of x
is____ (Nearest integer) [Given Kw = 1 x 10–¹⁴ and Kb = 1.8 x 10–⁵]
JEE Main Solved Paper Question Answer With Solutions
JEE Main 2021 Paper with Solutions
| ⚫ | JEE Main 2021 Paper with Solutions – 26th August – Shift 1 |
| 1. | JEE Main Physics Question Paper |
| 2. | JEE Main Chemistry Question Paper |
| 3. | JEE Main Maths Question Paper |
