Practice Questions

Q42.On the treatment of the following compound with a strong acid, the most susceptible site for bond cleavage is: (1) O2 −C3 (2) O5-C6 (3) C4 −O5 (4) C1 −O2

Q42.Hydrogen peroxide oxidises [Fe (CN)6]4−to [Fe (CN)6]3− in acidic medium, but reduces [Fe (CN)6]3−to [Fe (CN)6]4− in alkaline medium. The other products formed are, respectively (1) H2O and (H2O + OH−) (2) (H2O + O2) and H2O (3) (H2O + O2) and (H2O + OH−) (4) H2O and (H2O + O2)

Q43.The mass of a non-volatile, non-electrolyte solute (molar mass = 50 g mol−1 ) needed to be dissolved in 114 g octane to reduce its vapour pressure by 75 %, is: (1) 37.5 g (2) 75 g (3) 150 g (4) 50 g

Q43.The minimum volume of water required to dissolve 0.1 g lead (II) chloride to get a saturated solution ( Ksp of PbCl2 = 3.2 × 10−8 ;atomic mass of Pb = 207 u ) is: (1) 1.798 L (2) 0.36 L (3) 17.98 L (4) 0.18 L

Q43.When metal M is treated with NaOH , a white gelatinous precipitate X is obtained, which is soluble in excess of NaOH . Compound X when heated strongly gives an oxide which is used in chromatography as an adsorbent. The metal M is (1) Fe (2) Zn (3) Ca (4) Al

Q43.The minimum volume of water required to dissolve 0.1 g lead (II) chloride to get a saturated solution (KSP of PbCl2 = 3.2 × 10−8 ; atomic mass of Pb = 207 u) is : JEE Main 2018 (15 Apr Shift 1 Online) JEE Main Previous Year Paper (1) 1.798 L (2) 0.36 L (3) 17.95 L (4) 0.18 L

Q43.Two compounds I and II are eluted by column chromato-graphy(adsorption of I > II). Which one of the following is a correct statement? (1) II moves slower and has higher Rf value than I (2) II moves faster and has higher Rf value than I (3) I moves faster and has higher Rf value than II (4) I moves slower and has higher Rf value than I

Q44.The correct match between items of List-I and List-II is List - I List - II (A) Coloured impurity (P) Steam distillation (B) Mixture of o – nitrophenol and p –nitrophenol (Q) Fractional distillation (C) Crude Naphtha (R) Charcoal treatment (D) Mixture of glycerol and sugars (S) Distillation under reduced pressure (1) (A) −(R), (B) −(S), (C) −(P), (D) −(Q) (2) (A) −(P), (B) −(S), (C) −(R), (D) −(Q) (3) (A) −(R), (B) −(P), (C) −(Q), (D) −(S) (4) (A) −(R), (B) −(P), (C) −(S), (D) −(Q)

Q44.When 9.65 ampere current was passed for 1.0 hour into nitrobenzene in acidic medium, the amount of p- aminophenol produced is: (1) 109.0 g (2) 98.1 g (3) 9.81 g (4) 10.9 g

Q44.When 2-butyne is treated with H2 /Lindlar's catalyst, compound X is produced as the major product and when treated with Na /liq. NH3 it produces Y as the major product. Which of the following statements is correct? (1) Y will have higher dipole moment and higher (2) Y will have higher dipole moment and lower boiling point than X Y boiling point than X (3) X will have lower dipole moment and lower (4) X will have higher dipole moment and higher boiling point than Y boiling point than Y

Q44.Which of the following compounds will be suitable for Kjeldahl's method for nitrogen estimation? (1) (2) (3) (4)

Q44.A white sodium salt dissolves readily in water to give a solution which is neutral to litmus. When silver nitrate solution is added to the aforementioned solution, a white precipitate is obtained which does not dissolve in dil. nitric acid. The anion is : (1) CO2−3 (2) SO2−4 (3) S2− (4) Cl−

Q45.The correct match between items of List-I and List-II is : (1) (A)-(r),(B)-(s), (C)-(p),(D)-(q) (2) (A)-(p),(B)-(s), (C)-(r),(D)-(q) (3) (A)-(r), (B)-(p), (C)-(q), (D)-(s) (4) (A)-(r),(B)-(p), (C)-(s),(D)-(q)

Q45.If 50 % of a reaction occurs in 100 second and 75 % of the reaction occurs in 200 second, the order of this reaction is: (1) 2 (2) 3 (3) Zero (4) 1

Q45.The trans-alkenes are formed by the reduction of alkynes with (1) Sn −HCl (2) H2 −Pd /C, BaSO4 (3) NaBH4 (4) Na / liq. NH3

Q45.The major product formed in the following reaction is: JEE Main 2018 (15 Apr Shift 2 Online) JEE Main Previous Year Paper (1) (2) (3) (4)

Q45.The IUPAC name of the following compound is (1) 3−ethyl −4−methylhex −4−ene (2) 4, 4−diethyl −3−methylbut −2−ene (3) 4−methyl −3−ethylhex −4−ene (4) 4−ethyl −3−methylhex −2−ene

Q46.Biochemical oxygen demand(BOD) value can be a measure of water pollution caused by the organic matter. Which of the following statements is correct? (1) Polluted water has BOD value higher than (2) Aerobic bacteria decreases the BOD value 10ppm (3) Anaerobic bacteria increases the BOD value (4) Clean water has BOD value higher than 10 ppm

Q46.Which one of the following is not a property of physical adsorption? (1) Higher the pressure, more the adsorption (2) Greater the surface area, more the adsorption (3) Lower the temperature, more the adsorption (4) Unilayer adsorption occurs

Q46.The increasing order of nitration in the acidic medium of the following compounds is: (1) (a) < (b) < (d) < (c) (2) (a) < (b) < (c) < (d) (3) (b) < (a) < (c) < (d) (4) (b) < (a) < (d) < (c) JEE Main 2018 (15 Apr) JEE Main Previous Year Paper

Q46. The IUPAC name of the following compound is : (1) 3−ethyl −4−methylhex −4−ene (2) 4, 4−diethyl −3−methylbut −2−ene (3) 4−methyl −3−ethylhex −4−ene (4) 4−ethyl −3−methylhex −2−ene

Q46.The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to make teeth enamel harder by converting [3 Ca3 (PO4)2. Ca (OH)2] to: (1) [3 Ca (OH)2. CaF2] (2) [CaF2] (3) [3(CaF2). Ca (OH)2] (4) [3 Ca3 (PO4)2. CaF2]

Q47.All of the following share the same crystal structure except. (1) RbCl (2) NaCl (3) CsCl (4) LiCl

Q47.Which type of 'defect' has the presence of cations in the interstitial sites? (1) Metal deficiency defect (2) Schottky defect (3) Vacancy defect (4) Frenkel defect

Q47.Which of the following arrangements shows the schematic alignment of magnetic moments of antiferromagnetic substance? (1) (2) (3) (4)