Practice Questions

Q48.Which of the following represents the Freundlich adsorption isotherms? (A) JEE Main 2023 (08 Apr Shift 1) JEE Main Previous Year Paper (B) (C) (D) Choose the correct answer from the options given below: (1) A, C, D only (2) A, B only (3) B, C, D only (4) A, B, D only

Q48.The number of statement/s which are the characteristics of physisorption is ___________. A. It is highly specific in nature B. Enthalpy of adsorption is high C. It decreases with increase in temperature D. It results into unimolecular layer E. No activation energy is needed

Q48.The resistivity of a 0. 8M solution of an electrolyte is 5 × 10−3Ωcm. Its molar conductivity is 104Ω−1 cm2 mol−1 . (Nearest integer)

Q48.Compound A reacts with NH4 Cl and forms a compound B. Compound B reacts with H2O and excess of CO2 to form compound C which on passing through or reaction with saturated NaCl solution forms sodium hydrogen carbonate. Compound A. B and C, are respectively. (1) CaCl2, NH3, NH4 HCO3 (2) CaCl2, NH+4 , (NH4)2 CO3 (3) Ca(OH)2, NH3, NH4 HCO3 (4) Ca(OH)2, NH+4 , (NH4)2 CO3

Q48.The number of incorrect statement/s from the following is/are A. Water vapours are adsorbed by anhydrous calcium chloride. B. There is a decrease in surface energy during adsorption. C. As the adsorption proceeds, ΔH becomes more and more negative. D. Adsorption is accompanied by decrease in entropy of the system.

Q48.Following figure shows dependence of molar conductance of two electrolytes on concentration. Λ0m is the limiting molar conductivity. The number of Incorrect statement(s) from the following is _____ (A) Λ0m for electrolyte A is obtained by extrapolation (B) For electrolyte B, Λm Vs √c graph is a straight line with intercept equal to Λ0m (C) At infinite dilution, the value of degree of dissociation approach zero for electrolyte B . (D) Λm for any electrolyte A or B can be calculated using λ° for individual ions.

Q48.The major component of which of the following ore is sulphide based mineral? (1) Calamine (2) Siderite (3) Sphalerite (4) Malachite

Q48.Amongst the following compounds, which one is an antacid? (1) Ranitidine (2) Meprobamate (3) Terfenadine (4) Brompheniramine

Q48.An organic compound undergoes first order decomposition. If the time taken for the 60% decomposition is 540 s, then the time required for 90% decomposition will be is _____ s. (Nearest integer). Given : ln 10 = 2. 3; log 2 = 0. 3

Q48.In the reaction given below The product ‘X’ is : (1) (2) (3) (4)

Q48.For a chemical reaction A + B → Product, the order is 1 with respect to A and B. Rate [A] [B] mol L−1 S−1 mol L−1 mol L−1 0. 10 20 0. 5 0. 40 x 0. 5 0. 80 40 y What is the value of x and y? (1) 160 and 4 (2) 80 and 4 (3) 80 and 2 (4) 40 and 4 JEE Main 2023 (11 Apr Shift 2) JEE Main Previous Year Paper

Q48.For lead storage battery pick the correct statements A. During charging of battery, PbSO4 on anode is converted into PbO2 B. During charging of battery, PbSO4 on cathode is converted into PbO2 C. Lead storage battery consists of grid of lead packed with PbO2 as anode D. Lead storage battery has ~38% solution of sulphuric acid as an electrolyte Choose the correct answer from the options given below: (1) A, B, D only (2) B, C, D only (3) B, C only (4) B, D only

Q48. t87.5 is the time required for the reaction to undergo 87. 5% completion and t50 is the time required for the reaction to undergo 50% completion. The relation between t87.5 and t50 for a first order reaction is t87.5 = x × t50 The value of x is _________. (Nearest integer)

Q48.Compound A from the following reaction sequence is : (1) Benzoic Acid (2) Aniline (3) Salicylic Acid (4) Phenol JEE Main 2023 (13 Apr Shift 2) JEE Main Previous Year Paper

Q48. In the above conversion the correct sequence of reagents to be added is (1) (i) KMnO4, (ii) Br2 / Fe, (iii) Fe /H+, (iv) Cl2(2) (i) Br2 / Fe, (ii) Fe /H+, (iii) KMnO4, (iv) Cl2 (3) (i) Fe /H+, (ii) HONO, (iii) CuCl, (iv) KMnO4(4) (i)(v)Br2Br2/ Fe, (ii) Fe /H+, (iii) HONO, (iv) CuCl (v) KM

Q48.Match List I with List II List II List II (A) Tranquilizers (I) Anti blood clotting (B) Aspirin (II) Salvarsan (C) Antibiotic (III) Antidepressant drugs (D) Antiseptic (IV) Soframicine Choose the correct answer from the options given below: (1) (A)–IV, (B)–II, (C)–I, (D)–III (2) (A)–II, (B)–I, (C)–III, (D)–IV (3) (A)–III, (B)–I, (C)–II, (D)–IV (4) (A)–II, (B)–IV, (C)–I, (D)–III

Q48.The graph which represents the following reaction is: OH− (C6H5)3C −Cl Pyridine (C6H5)3C −OH (1) (2) (3) (4)

Q48. Compound P is neutral, Q gives effervescence with NaHCO3 while R reacts with Hinsberg’s reagent to give solid soluble in NaOH . Compound P is (1) (2) (3) (4)

Q48.The standard reduction potentials at 295 K for the following half cells are given below: NO3−+ 4H+ + 3e−→NO(g) + 2H2O Eo = 0. 97 V V2+(aq) + 2e−→V(s) Eo = −1. 19 V Fe3+(aq) + 3e−→Fe(s) Eo = −0. 04 V Ag+(aq) + e−→Ag(s) Eo = 0. 80 V Au3+(aq) + 3e−→Au(s) Eo = 1. 40 V The number of metal(s) which will be oxidised by NO3− in aqueous solution is _____.

Q48.The correct reaction profile diagram for a positive catalyst reaction. JEE Main 2023 (08 Apr Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q48.Isomeric amines with molecular formula C8H11N give the following tests IsomerP ⇒ Can be prepared by Gabriel phthalimide synthesis IsomerQ ⇒ Reacts with Hinsberg’s reagent to give solid insoluble in NaOH IsomerR ⇒ Reacts with HONO followed by β-naphthol in NaOH to give red dye. IsomersP, Q and R respectively are JEE Main 2023 (10 Apr Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q49.Polymer used in orlon is: (1) Polyethene (2) Polycarbonate (3) Polyamide (4) Polyacrylonitrile

Q49.Given below are two statements:- Statement I:- In froth floatation method a rotating paddle agitates the mixture to drive air out of it. Statement II:- Iron pyrites are generally avoided for extraction of iron due to environmental reasons. In the light of the above statements, choose the correct answer from the options given below:- (1) Both Statement I and Statement II are true (2) Statement I is false but Statement II is true (3) Statement I is true but Statement II is false (4) Both Statement I and Statement II are false

Q49.Total number of acidic oxides among N2O3, NO2, N2O, Cl2 O7, SO2, CO, CaO, Na2 O and NO is _____ .

Q49.What happens when a lyophilic sol is added to a lyophobic sol? (1) Film of lyophilic sol is formed over lyophobic (2) Lyophilic sol is dispersed in lyophobic sol sol (3) Film of lyophobic sol is formed over lyophilic (4) Lyophobic sol is coagulated sol