Practice Questions

Q42.The hydrocarbon with seven carbon atoms containing a neopentyl and a vinyl group is: (1) 2, 2 −dimethyl −4 −pentene (2) 4, 4 −dimethylpent −1 −ene (3) Isopropyl −2 −butene (4) 2, 2 −dimethyl −3 −pentene Q43. 5 L of an alkane requires 25 L of oxygen for its complete combustion. If all volumes are measured at constant temperature and pressure, the alkane is (1) Isobutane (2) Ethane (3) Butane (4) Propane

Q42.The reaction of propene with HOCl (Cl2 + H2O) proceeds through the intermediate: (1) CH3 −CH(OH) −CH+2 (2) CH3 −CHCl −CH+2 (3) CH3 −CH+ −CH2 −OH (4) CH3 −CH+ −CH2 −Cl

Q42.Consider the reaction sequence below: X is : (1) (2) (3) (4)

Q44.An aqueous solution of a salt MX2 at certain temperature has a Van't Hoff factor of 2 . What is the degree of dissociation for this solution of the salt? (1) 0. 50 (2) 0. 33 (3) 0. 67 (4) 0. 80

Q45.Oxidation of succinate ion produces ethylene and carbon dioxide gases. On passing 0. 2 Faraday electricity through an aqueous solution of potassium succinate, what is the total volume of gases (at both cathode and anode) at STP ( 1 atm and 273 K)? (1) 8. 96 L (2) 4. 48 L (3) 6. 72 L (4) 2. 24 L

Q45.The solubility of N2 in water at 300 K and 500 torr partial pressure is 0 .01 g L−1. The solubility (in g L−1 ) at 750 torr partial pressure is: (1) 0.0075 (2) 0.005 (3) 0. 02 (4) 0.015

Q46.Identify the correct statement: JEE Main 2016 (10 Apr Online) JEE Main Previous Year Paper (1) Corrosion of iron can be minimised by forming a (2) Iron corrodes in oxygen-free water contact with another metal with a higher reduction potential (3) Corrosion of iron can be minimised by forming (4) Iron corrodes more rapidly in salt water because an impermeable barrier at its surface its electrochemical potential is higher

Q46.Decomposition of H2O2 follows a first order reaction. In fifty minutes the concentration of H2O2 decreases from 0.5 to 0.125 M in one such decomposition. When the concentration of H2O2 reaches 0.05 M , the rate of formation of O2 will be: JEE Main 2016 (03 Apr) JEE Main Previous Year Paper (1) 2.66 Lmin−1 at STP (2) 1.34 × 10−2 mol min−1 (3) 6.93 × 10−2 mol min−1 (4) 6.93 × 10−4 mol min−1

Q47.The reaction of ozone with oxygen atoms in the presence of chlorine atoms can occur by a two step process shown below: O3(g) + Cl∙→O2(g) + ClO∙(g) ...(i) ki = 5.2 × 109 L mol−1 s−1 ClO∙(g) + O∙(g) →O2(g) + Cl∙(g) ...(ii) kii = 2.6 × 1010 L mol−1 s−1 JEE Main 2016 (09 Apr Online) JEE Main Previous Year Paper The closest rate constant for the overall reaction O3(g) + O∙(g) →2O2(g) is: (1) 1.4 × 1020 L mol−1 s−1 (2) 3.1 × 1010 L mol−1 s−1 (3) 5.2 × 109 L mol−1 s−1 (4) 2.6 × 1010 L mol−1 s−1

Q48.A particular adsorption process has the following characteristics: (i) It arises due to van der Waals forces and (ii) it is reversible. Identify the correct statement that describes the above adsorption process: (1) Adsorption is monolayer (2) Adsorption increases with increase in temperature (3) Enthalpy of adsorption is greater than (4) Energy of activation is low 100 kJ mol−1

Q48.Gold numbers of some colloids are Gelatin: 0. 005 −0. 01, Gum Arabic: 0. 15 −0. 25, Oleate: 0. 04 −1. 0 , Starch: 15 −25 . Which among the following is a better protective colloid? (1) Gelatin (2) Starch (3) Oleate (4) Gum Arabic

Q49.The most appropriate method of making egg-albumin sol is: (1) Break an egg carefully and transfer the (2) Keep the egg in boiling water for 10 minutes. transparent part of the content to 100 mL of 5% After removing the shell, transfer the yellow part w/V saline solution and stir well of the content to 100 mL of 5% w/V saline solution and homogenize with a mechanical shaker (3) Keep the egg in boiling water for 10 minutes. (4) Break an egg carefully and transfer only the After removing the shell, transfer the white part yellow part of the content to 100 mL of 5% w/V of the content to 100 mL of 5% w/V saline saline solution and stir well solution and homogenize with a mechanical shaker

Q50.The pair in which phosphorous atoms have a formal oxidation state of + 3 is: (1) Orthophosphorous and hypophospheric acids (2) Pyrophosphorous and pyrophosphoric acids (3) Orthophosphorous and pyrophosphorous acids (4) Pyrophosphorous and hypophosphoric acids

Q50.Identify the incorrect statement : (1) The S-S-S bond angles in the S8 and S6 rings are (2) Rhombic and monoclinic Sulphur have S8 the same. molecules. (3) S2 is paramagnetic like oxygen. (4) S8 ring has a crown shape.

Q51.Which of the following are the transition metal ions responsible for colour in ruby and emerald respectively? (1) Co3+ and Cr3+ (2) Co3+ and Co3+ (3) Cr3+ and Cr3+ (4) Cr3+ and Ag+

Q51.The reaction of zinc with dilute and concentrated nitric acid, respectively, produces: (1) NO and N2O (2) NO2 and N2O (3) N2O and NO2 (4) NO2 and NO

Q52.Which one of the following species is stable in aqueous solution? (1) Cr2+ (2) MnO2−4 (3) MnO3−4 (4) Cu+

Q52.Find the metallic and ferromagnetic substance. (1) VO2 (2) MnO2 (3) TiO2 (4) CrO2

Q53.Which one of the following complexes shows optical isomerism? (en=ethylendiamine) (1) trans [Co(en)2 Cl2] Cl (2) [Co(NH3)4 Cl2] Cl (3) [Co (NH3)3 Cl3] (4) cis [Co(en)2 Cl2]Cl

Q53.Fluorination of an aromatic ring is easily accomplished by treating a diazonium salt with HBF4 . Which of the following conditions is correct about this reaction? (1) NaF/Cu (2) Cu2O/H2O (3) Only Heat (4) NaNO2/Cu

Q53.Which one of the following complexes will consume more equivalents of aqueous solution of AgNO3 ? (1) Na2[CrCl5(H2O)] (2) Na3[CrCl6] (3) [Cr(H2O)5Cl]Cl2 (4) [Cr(H2O)6]Cl3

Q54.Identify the correct trend given below: (Atomic No. = Ti : 22, Cr : 24 and Mo : 42) (1) Δ of [Cr(H2O)6]2+ > [Mo(H2O)6]2+ and (2) Δ of [Cr(H2O)6]2+ > [Mo(H2O)6]2+ and Δ of [Ti(H2O)6]3+ > [Ti(H2O)6]2+ Δ of [Ti(H2O)6]3+ < [Ti(H2O)6]2+ (3) Δ of [Cr(H2O)6]2+ < [Mo(H2O)6]2+ and (4) Δ of [Cr(H2O)6]2+ < [Mo(H2O)6]2+ and Δ of [Ti(H2O)6]3+ > [Ti(H2O)6]2+ Δ of [Ti(H2O)6]3+ < [Ti(H2O)6]2+

Q54.Which one of the following reagents is not suitable for the elimination reaction? (1) NaI (2) NaOEt/EtOH (3) NaOH/H2O, Δ (4) NaOH/H2O −EtOH JEE Main 2016 (10 Apr Online) JEE Main Previous Year Paper

Q54.The pair having the same magnetic moment is: [At. No. : Cr = 24, Mn = 25, Fe = 26, Co = 27] (1) [Mn (H2O)6]2+ and [Cr(H2O)6]2+ (2) [CoCl4]2− and [Fe(H2O)6]2+ (3) [Cr(H2O)6]2+ and [CoCl4]2− (4) [Cr(H2O)6]2+ and [Fe(H2O)6]2+ JEE Main 2016 (03 Apr) JEE Main Previous Year Paper

Q55.Bromination of cyclohexene under conditions given below yields: (1) (2) (3) (4)