Practice Questions

Q40.An ideal gas undergoes a cyclic process as shown in the figure ΔUBC = −5 KJmol−1, qAB = 2 KJmol−1 WAB = −5 KJmol−1, WCA = 3 KJmol−1 Heat absorbed by the system during process CA is (1) −5 KJmol−1 (2) +5 KJmol−1 (3) −18 KJmol−1 (4) 18 KJmol−1

Q41.The total number of optically active compounds formed in the following reaction is: (1) Zero (2) Six (3) Four (4) Two

Q41.In which of the following reactions, an increase in the volume of the container will favour the formation of products? JEE Main 2018 (15 Apr) JEE Main Previous Year Paper (1) 4 NH3 (g) + 5O2 (g) ⇌ 4 NO(g) + 6H2O(l) (2) 2 NO2 (g) ⇌ 2 NO(g) + O2(g) (3) 3O2 (g) ⇌ 2O3(g) (4) H2 (g) + I2 (g) ⇌ 2HI(g)

Q41.An alkali is titrated against acid with methyl orange as an indicator, which of the following is a correct combination? (1) Base Acid End point (2) Base Acid End point Strong Strong Pink to colourless Weak Srtong Colourless to pink (3) Base Acid End point (4) Base Acid End point Strong strong Pinkish red to yellow Weak Strong Yellow to pinkish red

Q41.A group 13 element 'X' reacts with chlorine gas to produce a compound XCl3. XCl3 is electron deficient and easily reacts with NH3 to form Cl3 X ←NH3 adduct; however, XCl3 does not dimerize. X is: (1) B (2) Al (3) In (4) Ga JEE Main 2018 (16 Apr Online) JEE Main Previous Year Paper

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 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.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: (1) 1.798 L (2) 0.36 L (3) 17.98 L (4) 0.18 L

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

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−

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

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.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)

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.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

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

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

Q47.Which of the following will most readily give the dehydrohalogenation product? (1) (2) (3) (4) JEE Main 2018 (15 Apr Shift 1 Online) JEE Main Previous Year Paper

Q47.In the extraction of copper from its sulphide ore, metal is finally obtained by the oxidation of cuprous sulphide with: (1) SO2 (2) Fe2 O3 (3) Cu2 O (4) CO

Q48.Two 5 molal solutions are prepared by dissolving a non-electrolyte, non-volatile solute separately in the solvents X and Y . The molecular weights of the solvents are MX and MY , respectively where MX = 43 MY . The relative lowering of vapour pressure of the solution in X is " m " times that of the solution in Y. Given that the number of moles of solute is very small in comparison to that of solvent, the value of "m" is: (1) 3 (2) 1 4 2 (3) 1 (4) 4 4 3 conversion of A (in

Q48.For 1 molal aqueous solution of the following compounds, which one will show the highest freezing point? JEE Main 2018 (08 Apr) JEE Main Previous Year Paper (1) [Co (H2O)3 Cl3]. 3H2O (2) [Co (H2O)6] Cl3 (3) [Co (H2O)5 Cl] Cl2. H2O (4) [Co (H2O)4 Cl2] Cl. 2H2O

Q48.The major product of the following reaction is (1) (2) (3) (4)