Practice Questions

Q57.Consider the cell PtsH2g, 1atmH+aq, 1M | Fe3 + aq, Fe2 + aq Pt s When the potential of the cell is 0 . 712 V at 298 K, the ratio Fe2 + / Fe3 + is (Nearest integer) + + + + 2 . 303RT Given: Fe3 + e- = Fe2 , E°Fe3 , Fe2 Pt = 0 . 771 = 0 . 06 V F

Q57.The logarithm of equilibrium constant for the reaction Pd2 + + 4Cl- ⇌PdCl42 - is (Nearest integer) 2 . 303RT Given: = 0 . 06 V F Pd2 + + 2e- ⇌Pd(s) E𝑜= 0 . 83 V ( aq ) PdCl42 - (aq) + 2e- ⇌Pd(s) + 4Cl- (aq) Eo = 0 . 65 V

Q57.Mass of Urea NH2CONH2 required to be dissolved in 1000 g of water in order to reduce the vapour pressure of water by 25% is _______ g . (Nearest integer) Given : Molar mass of N, C, O and H are 14, 12, 16 and 1 g mol-1 respectively.

Q57.Sodium metal crystallises in a body centred cubic lattice with unit cell edge length of 4 Å. The radius of sodium atom is ___ × 10-1Å. (Nearest integer)

Q57.Reaction of propanamide with Br2 / KOH (aq) produces: (1) Ethylnitrile (2) Propylamine (3) Propanenitrile (4) Ethylamine

Q57.Number of isomeric aromatic amines with molecular formula C8H11N, which can be synthesized by Gabriel Phthalimide synthesis is _____.

Q57.At what pH, given half cell MnO4- (0 . 1M) ∣Mn2 + ( 0 . 001 M ) will have electrode potential of 1 . 282 V ? (Nearest Integer) Given 𝑜 + = 1 . 54 V, 2 . 303RT = 0 . 059 V EMnO4- / Mn2 F

Q57.An aqueous solution of volume 300 cm3 contains 0 . 63 g of protein. The osmotic pressure of the solution at 300 K is 1 . 29 mbar. The molar mass of the protein is gmol-1. Given : R = 0 . 083 LbarK-1 mol-1

Q57.In an electrochemical reaction of lead, at standard temperature, if EPb2o + / Pb = n Volt, then the value of E°Pb2 + / Pb4 + is given by m – xn. The value of x is _______. EPb4o + / Pb (Nearest integer)

Q57.Match List I with List II. List I List II Reaction Reagents Hoffmann (A) (I) Conc. KOH, Δ Degradation Clemmensen (B) (II) CHCl3, NaOH /H3O+ reduction (C) Cannizzaro reaction (III) Br2, NaOH Reimer-Tiemann (D) (IV) Zn −Hg / HCl reaction (1) (A) - III, (B) - IV, (C) - II, (D) - I (2) (A) - II, (B) - IV, (C) - I, (D) - III (3) (A) - III, (B) - IV, (C) - I, (D) - II (4) (A) - II, (B) - I, (C) - III, (D) - IV

Q57. Product [X] formed in the above reaction is: (1) (2) (3) (4)

Q57.Number of compounds giving (i) red colouration with ceric ammonium nitrate and also (ii) positive iodoform test from the following is _________ JEE Main 2023 (25 Jan Shift 2) JEE Main Previous Year Paper

Q57.At 298 K, a 1 litre solution containing 10 mmol of Cr2O72 - and 100mmol of Cr3 + shows a pH of 3 . 0. 2 - + 2 . 303RT Given : Cr2O7 →Cr3 ; E0 = 1 . 330 V and F = 0 . 059 V The potential for the half cell reaction is x × 10-3 V . The value of x is _____ .

Q57.The mass of NH3 produced when 131. 8 kg of cyclohexane carbaldehyde undergoes Tollen’s test is _____ kg. (Nearest Integer) Molar mass of C = 12 g/ mol N = 14 g/ mol O = 16 g/ mol

Q57.A compound ′X′ when treated with phthalic anhydride in presence of concentrated H2 SO4 yields ′Y′. ′Y′ is used as an acid/base indicator. ′X′ and ′Y′ are respectively (1) Anisole, methyl orange (2) Salicylaldehyde, Phenolphthalein (3) Toludine, Phenolphthalein (4) Carbolic acid, Phenolphthalein

Q57.Which of the following statements is incorrect for antibiotics? (1) An antibiotic must be a product of metabolism. (2) An antibiotic is a synthetic substance produced as a structural analogue of naturally occurring antibiotic. (3) An antibiotic should promote the growth or (4) An antibiotic should be effective in low survival of microorganisms. concentrations.

Q57.For the given reaction The, total number of possible products formed by tertiary carbocation of A is _______. JEE Main 2023 (13 Apr Shift 1) JEE Main Previous Year Paper

Q57.An organic compound [A](C4H11 N), shows optical activity and gives N2 gas on treatment with HNO2 . The compound [A] reacts with PhSO2 Cl producing a compound which is soluble in KOH. The structure of A is : JEE Main 2023 (31 Jan Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q57.Choose the correct colour of the product for the following reaction. (1) Yellow (2) White (3) Red (4) Blue

Q57.In the following reaction, the total number of oxygen atoms in 𝑋 and 𝑌 is______ Na2O + H2O →2X Cl2O7 + H2O →2Y

Q57. In the above conversion of compound ( X ) to product ( Y ), the sequence of reagents to be used will be: (1) (i) Br2, Fe (2) (i) Br2(aq) (ii) Fe, H+ (ii) LiAlH4 (iii) LiAlH4 (iii) H3O+ (3) (i) Fe, H+ (4) (i) Fe, H+ (ii) Br2(aq) (ii) Br2(aq) (iii) HNO2 (iii) HNO2 (iv) CuBr (iv) H3 PO2

Q57.In a reaction JEE Main 2023 (01 Feb Shift 2) JEE Main Previous Year Paper reagents ‘ X ’ and ‘ Y ’ respectively are: (1) (CH3 CO)2O/H+ and CH3 OH /H+, Δ (2) (CH3 CO)2O/H+ and (CH3 CO)2O/H+ (3) CH3 OH /H+, Δ and CH3 OH /H+, Δ (4) CH3 OH /H+Δ and (CH3 CO)2O/H+

Q58.Number of compounds from the following which will not produce orange red precipitate with Benedict solution is........ Glucose, maltose, sucrose, ribose, 2-deoxyribose, amylose, lactose JEE Main 2023 (11 Apr Shift 2) JEE Main Previous Year Paper

Q58.Match List I with List II List I (Amines) List II (pKb) A. Aniline I. 3. 25 B. Ethanamine II. 3. 00 C. N-Ethylethanamine III. 9. 38 D. N, N-Diethylethanamine IV. 3. 29 Choose the correct answer from the options given below:- (1) A-I, B-IV, C-II, D-III (2) A-III, B-II, C-I, D-IV (3) A-III, B-II, C-IV, D-I (4) A-III, B-IV, C-II, D-I

Q58.If compound A reacts with B following first order kinetics with rate constant 2 . 011 × 10-3 s-1. The time taken by A (in seconds) to reduce from 7 g to 2 g will be _____ . (Nearest Integer) log5 = 0 . 698, log7 = 0 . 845, log2 = 0 . 301