Practice Questions

Q43.Given below are two statements: Statement I : α and β forms of sulphur can change reversibly between themselves with slow heating or slow cooling. Statement II : At room temperature the stable crystalline form of sulphur is monoclinic sulphur. In the light of the above statements, choose the correct answer from the options given below: (1) Both Statement I and Statement II are true. (2) Statement I is true but Statement II is false. (3) Statement I is false but Statement II is true. (4) Both Statement I and Statement II are false.

Q43.The set that represents the pair of neutral oxides of nitrogen is: (1) NO and N2O (2) N2O and N2O3 (3) N2O and NO2 (4) NO and NO2 JEE Main 2021 (17 Mar Shift 2) JEE Main Previous Year Paper

Q43. Identify the reagent(s) ' A ' and condition(s) for the reaction : (1) A = HCl; Anhydrous AlCl3 (2) A = HCl, ZnCl2 (3) A = Cl2 ; UV light (4) A = Cl2 ; dark, Anhydrous AlCl3

Q43.Identify the element for which electronic configuration in +3 oxidation state is [Ar]3 d5: (1) Ru (2) Mn (3) Co (4) Fe

Q43.The denticity of an organic ligand, biuret is : (1) 2 (2) 3 (3) 4 (4) 6 JEE Main 2021 (31 Aug Shift 1) JEE Main Previous Year Paper

Q43.Chalcogen group elements are : (1) Se, Te and Po. (2) O, Ti and Po. (3) Se, Tb and Pu . (4) S, Te and Pm .

Q44.The common positive oxidation states for an element with atomic number 24, are: (1) +2 to +6 (2) +1 and +3 to +6 (3) +1 and +3 (4) +1 to +6

Q44.What is the spin-only magnetic moment value (B.M.) of a divalent metal ion with atomic number 25, in its aqueous solution? JEE Main 2021 (17 Mar Shift 1) JEE Main Previous Year Paper (1) 5. 92 (2) 5. 0 (3) zero (4) 5. 26

Q44. In the above reaction, the reagent " A " is : (1) NaBH4, H3O+ (2) LiAlH4 (3) Alkaline KMnO4, H+ (4) HCl, Zn −Hg

Q44.The major components of German Silver are : (1) Zn, Ni and Ag (2) Cu, Zn and Ni (3) Ge, Cu and Ag (4) Cu, Zn and Ag

Q44.Which one of the following group- 15 hydride is the strongest reducing agent ? (1) AsH3 (2) BiH3 (3) PH3 (4) SbH3

Q45.Identify A in the given chemical reaction. JEE Main 2021 (26 Feb Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q45.Which of the following is Lindlar catalyst? JEE Main 2021 (16 Mar Shift 1) JEE Main Previous Year Paper (1) Zinc chloride and HCl (2) Cold dilute solution of KMnO4 (3) Sodium and Liquid NH3 (4) Partially deactivated palladised charcoal

Q46.Which one of the following compounds will give orange precipitate when treated with 2, 4 −dinitrophenyl hydrazine ? (1) (2) (3) (4)

Q47.In the reaction of hypobromite with amide, the carbonyl carbon is lost as: (1) CO2−3 (2) HCO−3 (3) CO2 (4) CO

Q47. R −CN (i) DIBAL−H ⟶R −Y Consider the above reaction and identify "Y" (ii)H2O (1) −CH2 NH2 (2) −CONH2 (3) − CHO (4) −COOH

Q47.Primary, secondary and tertiary amines can be separated using: (1) Para-Toluene sulphonyl chloride (2) Chloroform and KOH (3) Benzene sulphonic acid (4) Acetyl amide

Q48.Orlon fibres are made up of: (1) Polyacrylonitrile (2) Polyesters (3) Polyamide (4) Cellulose

Q48.Match List I with List II. List I (Monomer Unit) List II (Polymer) (a) Caprolactum (i) Natural rubber (b) 2 - Chloro-1, 3 - butadiene (ii) Buna-N (c) Isoprene (iii) Nylon 6 (d) Acrylonitrile (iv) Neoprene Choose the correct answer from the options given below: (1) a →iii, b →iv, c →i, d →ii (2) a →i, b →ii, c →iii, d →iv (3) a →ii, b →i, c →iv, d →iii (4) a →iv, b →iii, c →ii, d →i JEE Main 2021 (24 Feb Shift 1) JEE Main Previous Year Paper

Q48.Which one of the following chemicals is responsible for the production of HCl in the stomach leading to irritation and pain? (1) (2) (3) (4)

Q48.The major product of the following chemical reaction is : (1) CH3 CH2 CHO (2) CH3 CH2 CH2 OH (3) CH3 CH2 CH3 (4) (CH3 CH2 CO)2O

Q48. List −I List −II (Drug) (Class of Drug) (a) Furacin (i) Antibiotic (b) Arsphenamine (ii) Tranquilizers (c) Dimetone (iii) Antiseptic (d) Valium (iv) Synthetic antihistamines Choose the most appropriate match : (1) (a) −(i), (b) −(iii), (c) −(iv), (d) −(ii) (2) (a) −(iii), (b) −(iv), (c) −(ii), (d) −(i) (3) (a) −(ii), (b) −(i), (c) −(iii), (d) −(iv) (4) (a) −(iii), (b) −(i), (c) −(iv), (d) −(ii)

Q48.Match List-I with List-II : List-I Chemical Compound List-II Used as a Sucralose i Synthetic detergent b Glyceryl ester of stearic acid ii Artificial sweetener c Sodium benzoate iii Antiseptic d Bithional iv Food preservative Choose the correct match : JEE Main 2021 (17 Mar Shift 2) JEE Main Previous Year Paper (1) (a) −(iv), (b) −(iii), (c) −(ii), (d) −(i) (2) (a) −(ii), (b) −(i), (c) −(iv), (d) −(iii) (3) (a )-( iii ), ( b )-( ii ), (c) −(iv), (d) −(i) (4) (a) −(i), (b) −(ii), (c) −(iv), (d) −(iii)

Q48.Which of the following reaction is an example of ammonolysis? (1) C6H5COCl + C6H5 NH2 ⟶C6H5 CONHC6 H5(2) [H] C6H5 CH2 CN →C6H5 CH2 CH2 NH2 (3) HCl (4) C6H5 CH2 Cl + NH3 ⟶C6H5 CH2 NH2−C6H5 NH2 → C6H5 NH3 Cl−

Q48.Which of the following polymer is used in the manufacture of wood laminates ? (1) cis-poly isoprene (2) Melamine formaldehyde resin (3) Urea formaldehyde resin (4) Phenol and formaldehyde resin