Practice Questions

Q44.The osmotic pressure of a dilute solution of an ionic compound XY in water is four times that of a solution 0.01 M BaCl2 in water. Assuming complete dissociation of the given ionic compounds in water, the concentration of XY ( in mol L−1 ) in solution is (1) 4 × 10−2 (2) 16 × 10−4 (3) 4 × 10−4 (4) 6 × 10−2

Q44.A water sample has ppm level concentration of the following metals: Fe = 0 .2 ; Mn = 5 .0 ; Cu = 3 .0 ; Zn = 5 .0 . The metal that makes the water sample unsuitable for drinking is (1) Zn (2) Fe (3) Mn (4) Cu

Q44.The major product of the following addition reaction is (1) (2) (3) (4) JEE Main 2019 (12 Apr Shift 1) JEE Main Previous Year Paper

Q44.Which hydrogen in compound (E) is easily replaceable during bromination reaction in presence of light ? (1) β - hydrogen (2) δ - hydrogen (3) α -hydrogen (4) γ - hydrogen

Q44.The major product obtained in the given reaction is: (1) (2) (3) (4)

Q44.In the cell, Pt(s)|H2(g, 1 bar)| HCl (aq)|AgCl(s)| Ag(s)|Pt(s),the cell potential is 0 .92 V when a 10−6 molar HCl solution is used. The standard electrode potential of Ag AgCl Cl− electrode is: (Given, 2.303RT F = 0 .06 V at 298 K) (1) 0 .76 V (2) 0 .20 V (3) 0 .40 V (4) 0 .94 V

Q44.For the reaction, 2A + B → products, when the concentration of A and B both were doubled, the rate of the reaction increased from 0.3 mol L−1s−1 to 2.4 mol L−1s−1. When the concentration of A alone is doubled, the rate increased from 0.3 mol L−1s−1 to 0.6 mol L−1s−1. Which one of the following statements is correct? (1) Order of the reaction with respect to B is 2 (2) Total order of the reaction is 4 (3) Order of the reaction with respect to A is 2 (4) Order of the reaction with respect to B is 1

Q44.At room temperature, a dilute solution of urea is prepared by dissolving 0.60 g of urea in 360 g of water. If the vapour pressure of pure water at this temperature is 35 mm Hg , lowering of vapour pressure will be: (molar mass of urea = 60 g mol−1 ) (1) 0.028 mm Hg (2) 0.027 mm Hg (3) 0.031 mm Hg (4) 0.017 mm Hg

Q45.Consider the following reversible chemical reactions: k1 A2(g) + B2(g) ⇌2AB(g) .....(1) k2 6AB(g) ⇌3A2(g) + 3B2(g) .....(2) The relation between K1 and K2 is: (1) K2 = K 1−3 (2) K1K2 = 31 (3) K2 = K 13 (4) K1K2 = 3

Q45.The molecule that has minimum or no role in the formation of photochemical smog, is: (1) N2 (2) O3 (3) H2C = O (4) NO

Q45.Assertion: Ozone is destroyed by CFCs in the upper stratosphere. Reason: Ozone holes increase the amount of UV radiation reaching the earth. (1) Assertion and reason (2) The assertion is false, (3) Assertion and reason (4) Assertion and reason are correct, but the but the reason is are incorrect. are both correct, and reason is not the correct. the reason is the explanation for the correct explanation for assertion. the assertion.

Q45.A solid having density of 9 × 103 kg m−3 forms face centred cubic crystals of edge length 200√2pm. What is the molar mass of the solid? [Avogadro constant ≈6 × 1023 mol−1, π ≈3] (1) 0.0432 kg mol−1 (2) 0.0216 kg mol−1 (3) 0.0305 kg mol−1 (4) 0.4320 kg mol−1

Q45.Consider the statements S1 and S2 : S1 : Conductivity always increases with decreases in the concentration of electrolyte. S2 : Molar conductivity always increases with decreases in the concentration of electrolyte. The correct option among the following (1) S1 is wrong and S2 is correct (2) S1 is correct and S2 is wrong (3) Both S1 and S2 are correct (4) Both S1 and S2 are wrong

Q45.For the solution of the gases w, x, y and z in water at 298 K, the Henry's law constants ( KH ) are 0.5, 2, 35 and 40 kbar, respectively. The correct plot for the given data is: (1) (2) (3) (4)

Q45.Liquid M and liquid N form an ideal solution. The vapour pressures of pure liquids M and N are 450 and 700 mmHg, respectively, at the same temperature. Then correct statements is: ( xM = Mole fraction of 'M' in solution; xN = Mole fraction of 'N'in solution; JEE Main 2019 (09 Apr Shift 1) JEE Main Previous Year Paper yM = Mole fraction of 'M' in vapour phase; yN = Mole fraction of 'N' in vapour phase; ) (1) xM > yM (2) xM = yM xN yN xN yN (3) xM < yM (4) (xM −yM) < (xN −yN) xN yN

Q45.The one that is extensively used as a piezoelectric material is: (1) Tridymite (2) Quartz (3) Amorphous silica (4) Mica JEE Main 2019 (09 Jan Shift 1) JEE Main Previous Year Paper

Q45.Air pollution that occurs in sunlight is (1) Acid rain (2) Reducing smog (3) Fog (4) Oxidising smog JEE Main 2019 (10 Apr Shift 2) JEE Main Previous Year Paper

Q45.But-2-ene on reaction with alkaline KMnO4 at elevated temperature followed by acidification will give: (1) (2) 2 molecules of (3) (4) 2 Molecules of One molecular of and one molecular of

Q45.Water filled in two glasses A and B gave BOD values of 10 and 20, respectively. The correct statement regarding them is (1) A is suitable for drinking, whereas B is not (2) B is more polluted than A (3) Both A and B are suitable for drinking (4) A is more polluted than B

Q45.The one that is not a carbonate are is: (1) malachite (2) bauxite (3) calamine (4) siderite

Q45.For an elementary chemical reaction, A2 k1 ⇄ 2A , the expression for d[A]dt is: k−1 (1) 2k1[A2] −2k−1[A]2 (2) 2k1[A2] −k−1[A]2 (3) k1[A2] + k−1[A]2 (4) k1[A2] −k−1[A]2

Q45.Molecules of benzoic acid (C6H5 COOH) dimerise in 30 g of benzene. ' w ' g of benzoic acid shows a depression in freezing point equal to 2 K. If the percentage association of the acid to form dimer in the solution is 80, then w is: ( Given that Kf = 5 Kmol−1 , molar mass of benzoic acid = 122 gmol−1) (1) 1.0g (2) 2.4g (3) 1.8g (4) 1.5g Q46. ∧om for NaCl, HCl and NaA are 126.4, 425.9 and 100 .5 S cm2 mol−1 respectively. If the conductivity of 0 .001 M HA is 5 × 10−5S cm−1 , degree of dissociation of HA is (1) 0.125 (2) 0.75 (3) 0.25 (4) 0.50

Q45. K2HgI4 is 40% ionised in aqueous solution. The value of its van't Hoff factor (i) is: (1) 1.6 (2) 1.8 (3) 20 (4) 22

Q45.The ratio of number of atoms present in a simple cubic, body centered cubic and face centered cubic structure are, respectively : (1) 4 : 2 : 1 (2) 1 : 2 : 4 (3) 4 : 2 : 3 (4) 8 : 1 : 6

Q46.For coagulation of arsenious sulphide sol, which of the following salt solutions will be most effective? (1) Na3PO4 (2) NaCl (3) AlCl3 (4) BaCl2 JEE Main 2019 (09 Jan Shift 2) JEE Main Previous Year Paper