Practice Questions

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)

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

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.For certain chemical reaction X →Y , the rate of formation of product is plotted against the time as shown in the figure. The number of Correct statement/s from the following is _____ (A) Over all order of this reaction is one (B) Order of this reaction can't be determined (C) In region-I and III, the reaction is of first and zero order respectively (D) In region-II, the reaction is of first order (E) In region-II, the order of reaction is in the range of 0. 1 to 0. 9. JEE Main 2023 (29 Jan Shift 1) JEE Main Previous Year Paper

Q49.The metal which is extracted by oxidation and subsequent reduction from its ore is : (1) Al (2) Ag (3) Cu (4) Fe

Q49.The number of correct statements about modern adsorption theory of heterogeneous catalysis from the following is ...... A. The catalyst is diffused over the surface of reactants. B. Reactants are adsorbed on the surface of the catalyst. C. Occurrence of chemical reaction on the catalyst's surface through formation of an intermediate. D. It is a combination of intermediate compound formation theory and the old adsorption theory. E. It explains the action of the catalyst as well as those of catalytic promoters and poisons.

Q49.In the wet tests for identification of various cations by precipitation, which transition element cation doesn't belong to group IV in qualitative inorganic analysis? (1) Fe3 + (2) Zn2 + (3) Co2 + (4) Ni2 +

Q49.The graph of log mx vs log p for an adsorption process is a straight line inclined at an angle of 45° with intercept equal to 0. 6020 . The mass of gas adsorbed per unit mass of adsorbent at the pressure of 0. 4 atm is JEE Main 2023 (30 Jan Shift 2) JEE Main Previous Year Paper _____ ×10−1 (Nearest integer) Given : log 2 = 0. 3010

Q49.The reaction 2NO + Br2 →2 NOBr takes place through the mechanism given below NO + Br2 ⇌NOBr2 (fast) NOBr2 + NO →2 NOBr (slow) The overall order of the reaction is _____.

Q49.The statement/s which are true about antagonists from the following is/are: A. They bind to the receptor site. B. Get transferred inside the cell for their action. C. Inhibit the natural communication of the body. D. Mimic the natural messenger. Choose the correct answer from the options given below: (1) B only (2) A, C and D (3) A and C (4) A and B

Q49.The correct representation in six membered pyranose form for the following sugar [X] is JEE Main 2023 (01 Feb Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

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

Q49.Compound X undergoes following sequence of reactions to give the Lactone Y. (1) (2) (3) (4)