Practice Questions

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.Consider two chemical reactions (A) and (B) that take place during metallurgical process: Δ (A) ZnCO3(s) →ZnO(s) + CO2(g) Δ (B) 2 ZnS(s) + 3O2(g) →2 ZnO(s) + 2 SO2(g) The correct option of names given to them respectively is: JEE Main 2021 (20 Jul Shift 2) JEE Main Previous Year Paper (1) (A) is calcination and (B) is roasting (2) Both (A) and (B) are producing same product so both are roasting (3) Both (A) and (B) are producing same product so both are calcination (4) (A) is roasting and (B) is calcination

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. 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.Ellingham diagram is a graphical representation of : (1) ΔG vs P (2) (ΔG −TΔS) vs T (3) ΔH vs T (4) ΔG vs T

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. 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

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.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

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

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

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

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

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

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.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

Q48. is a repeating unit for : (1) Novolac (2) Buna-N (3) Acrilan (4) Neoprene

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