Practice Questions

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.Water samples with BOD values of 4 ppm and 18 ppm, respectively, are: (1) Highly polluted and Highly polluted (2) Clean and Clean (3) Highly polluted and Clean (4) Clean and Highly polluted

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

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 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.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.The radius of the largest sphere which fits properly at the centre of the edge of a body centred cubic unit cell is : (Edge length is represented by 'a') (1) 0.027 a (2) 0.047 a (3) 0.134a (4) 0.067 a

Q44.Consider the bcc unit cells of the solids 1 and 2 with the position of atoms as shown below. The radius of atom B is twice that of atom A . The unit cell edge length is 50 % more in solid 2 than in 1 . What is the approximate packing efficiency in solid 2 ? (1) 90 % (2) 45 % (3) 75 % (4) 65 %

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

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.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.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.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.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

Q46.The freezing point of a diluted milk sample is found to be −0.2∘C, while it should have been −0.5∘C for pure milk. How much water has been added to pure milk to make the diluted sample? (1) 1 cup of water to 2 cups of pure milk (2) 3 cups of water to 2 cups of pure milk (3) 1 cup of water to 3 cups of pure milk (4) 2 cups of water to 3 cups of pure milk

Q46.Calculate the standard cell potential (in V) of the cell in which the following reaction takes place: Fe2 + aq + Ag+aq →Fe3 + aq + Ag(s) Given that EAg+o / Ag = x V = y V EFe2o + / Fe = z V EFe3o + / Fe JEE Main 2019 (08 Apr Shift 2) JEE Main Previous Year Paper (1) x + 2y - 3z (2) x - y (3) x - z (4) x + y - z

Q46.Element B forms ccp structure and A occupies half of the octahedral voids, while oxygen atoms occupy all the tetrahedral voids. The structure of bimetallic oxide is: (1) A2BO4 (2) AB2O4 (3) A2B2O (4) A4B2O JEE Main 2019 (08 Apr Shift 1) JEE Main Previous Year Paper

Q46.The freezing point of a 4% aqueous solution of X is equal to the freezing point of a 12% aqueous solution of Y . If the molecular weight of X is A , then the molecular weight of Y will be (1) 2A (2) A (3) 4A (4) 3A

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

Q46.A bacterial infection in an internal wound grows as N'(t) = N0exp(t) , where the time t is in hours. A dose of antibiotic, taken orally, needs 1 hour to reach the wound. Once it reaches there, the bacterial population goes down as dN dt = −5N2 . What will be the plot of N0N vs t after 1 hour? JEE Main 2019 (10 Apr Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q46.A solution of sodium sulphate contains 92 𝑔 of Na+ ions per kilogram of water. The molality of Na+ ions in that solution in mol kg-1 is: (1) 16 (2) 4 (3) 12 (4) 8

Q46.Given the equilibrium constant: KC of the reaction: Cu(s) + 2Ag+(aq) →Cu2+(aq) + 2Ag(s) is 10 × 1015 calculate the E cell 0 of this reaction at 298 K [2.303 RTF at 298 K = 0.059 V] (1) 0.04736mV (2) 0.4736mV (3) 0.4736 V (4) 0.04736 V JEE Main 2019 (11 Jan Shift 2) JEE Main Previous Year Paper

Q46.A solution is prepared by dissolving 0.6 g of urea (molar mass = 60 g mol−1 ) and 1.8 g of glucose (molar mass = 180 g mol−1 ) in 100 mL of water at 27oC. The osmotic pressure of the solution is: ( R = 0.08206 Latm K−1 mol−1 ) (1) 8.2 atm (2) 2.46 atm (3) 4.92 atm (4) 1.64 atm

Q46.Assertion: For the extraction of iron, haematite ore is used. Reason: Haematite is a carbonate ore of iron. (1) Only the assertion is correct. (2) Only the reason is correct. (3) Both the assertion and reason are correct and the (4) Both the assertion and reason are correct, but the reason is the correct explanation for the assertion. reason is not the correct explanation for the assertion.

Q47.For the cell Zn(s) Zn2+(aq)∥Mx+(aq) M(s), different half cells and their standard electrode potentials are given below: JEE Main 2019 (11 Jan Shift 1) JEE Main Previous Year Paper If E∘ = −0.76 V, which cathode will give a maximum value of E cell0 per electron transferred? Zn2+/Zn (1) Ag+/Ag (2) Fe3+/Fe2+ (3) Au3+/Au (4) Fe2+/Fe