Practice Questions

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

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.Match List I with List II : s reacted with reagents in List I to form products in List II products in List II. List I (Reagent) List II (Product) A. I. B. HBF4,Δ II. C. Cu, HCl III. D. CuCN/KCN IV. Choose the correct answer from the options given below: (1) A-IV, B-III, C-II, D-I (2) A-III, B-I, C-II, D-IV (3) A-I, B-III, C-IV, D-II (4) A-III, B-I, C-IV, D-II

Q58.In Chromyl chloride, the oxidation state of chromium is (+) ___________.

Q58.A →B The rate constants of the above reaction at 200 K and 300 K are 0 . 03 min-1 and 0 . 05 min-1 respectively. The activation energy for the reaction is J (Nearest integer) (Given : In 10 = 2 . 3 R = 8 . 3 J K-1 mol-1 log 5 = 0 . 70 log 3 = 0 . 48 log2 = 0 . 30

Q58.Major product ′P′ formed in the following reaction is Major product JEE Main 2023 (08 Apr Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q58.A and B are two substances undergoing radioactive decay in a container. The half life of A is 15 min and that of B is 5 min. If the initial concentration of B is 4 times that of A and they both start decaying at the same time, how much time will it take for the concentration of both of them to be same? ________min.

Q58.The major product ‘ P’ formed in the following sequence of reactions is JEE Main 2023 (12 Apr Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q58.Match List-I and List-II. List-I List-II A. Elastomeric polymer I. Urea formaldehyde resin B. Fibre polymer II. Polystyrene C. Thermosetting polymer III. Polyester D. Thermoplastic polymer IV. Neoprene Choose the correct answer from the options given below: (1) A-II, B-III, C-I, D-IV (2) A-II, B-I, C-IV, D-III (3) A-IV, B-III, C-I, D-II (4) A-IV, B-I, C-III, D-II

Q58.Which of the following compounds are not used as disinfectants? A. Chloroxylenol B. Bithional C. Veronal D. Prontosil E. Terpineol Choose the correct answer from the options given below: (1) A, B, E (2) C, D (3) A, B (4) B, D, E

Q58.KClO3 + 6FeSO4 + 3H2SO4 → KCl + 3Fe2 ( SO4 ) + 3H2O 3 The above reaction was studied at 300 K by monitoring the concentration of FeSO4 in which initial concentration was 10 M and after half an hour became 8 . 8 M. The rate of production of Fe2 ( SO4 ) is 3 _______ × l0 – 6 mol L – 1 s – 1 (Nearest integer)

Q58.The major product ' P' for the following sequence of reactions is: (1) (2) (3) (4)

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.Sea water contains 29 . 25 % NaCl and 19 % MgCl2 by weight of solution. The normal boiling point of the sea water is ∘C (Nearest integer) Assume 100% ionization for both NaCl and MgCl2 Given: KbH2O = 0 . 52 K kg mol-1 Molar mass of NaCl and MgCl2 is 58 . 5 and 95 g mol-1 respectively.

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

Q58.If the degree of dissociation of aqueous solution of weak monobasic acid is determined to be 0 . 3, then the observed freezing point will be _____ % higher than the expected/theoretical freezing point. (Nearest integer).

Q59.In ammonium - phosphomolybdate, the oxidation state of Mo is +_______ JEE Main 2023 (06 Apr Shift 1) JEE Main Previous Year Paper

Q59.Match List I with List II LIST II LIST I Type Name AAntifertility I Norethindrone drug B Tranquilizer II Meprobomate C AntihistamineIII Seldane DAntibiotic IVAmpicillin JEE Main 2023 (24 Jan Shift 2) JEE Main Previous Year Paper Choose the correct answer from the options given below : (1) A-II, B-I, C-III, D-IV (2) A-IV, B-III, C-II, D-I (3) A-I, B-III, C-II, D-IV (4) A-I, B-II, C-III, D-IV

Q59.Match items of Row I with those of Row II. Row I: (P) (Q) (R) JEE Main 2023 (25 Jan Shift 1) JEE Main Previous Year Paper (S) Row II: (i) α‐D‐(—) Fructofuranose. (ii) β‐D‐(—) Fructofuranose. (iii) α‐D‐(‐) Glucopyranose. (iv) β‐D‐(‐) Glucopyranose. Correct match is (1) P→iv, Q→iii, R→i, S→ii (2) P→i, Q→ii, R→iii, S→iv (3) P→iii, Q→iv, R→ii, S→i (4) P→iii, Q→iv, R→i, S→ii

Q59.Given below are two statements : Statement I : Upon heating a borax bead dipped in cupric sulphate in a luminous flame, the colour of the bead becomes green. Statement II : The green colour observed is due to the formation of copper(I) metaborate In the light of the above statements, choose the most appropriate answer from the options given below: (1) Both Statement I and Statement II are false (2) Both Statement I and Statement II are true (3) Statement I is false but Statement II is true (4) Statement I is true but Statement II is false

Q59.The d-electronic configuration of CoCl4 2 - in tetrahedral crystal field is emt2n. The sum of m and number of unpaired electrons is

Q59.Given below are two statements: One is labelled as Assertion A and the other labelled as Reason R. Assertion A : Antihistamines do not affect the secretion of acid in stomach. Reason R : Antiallergic and antacid drugs work on different receptors. In the light of the above statements, choose the correct answer from the options given below: (1) A is false but R is true (2) Both A and R are true and R is the correct explanation of A (3) A is true but R is false (4) Both A and R are true but R is not the correct explanation of A .

Q59.Formation of which complex, among the following, is not a confirmatory test of Pb2+ ions (1) Lead sulphate (2) Lead nitrate (3) Lead chromate (4) Lead iodide

Q59.At 298 K, the standard reduction potential for Cu2 + / Cu electrode is 0 . 34 V. Given : = 0 . 059 V The reduction potential at pH = 14 for the above couple KspCu(OH ) 2 = 1 × 10-20 Take 2 . 303RTF is ( - )𝑥× 10-2 V. The value of x is

Q59.Match List I with List II List I List II (Example) (Type) A 2-chloro- 1, 3-butadiene I Biodegradable polymer B Nylon 2-nylon 6 II Synthetic Rubber C Polyacrylonitrile III Polyester D Dacron IV Addition Polymer Choose the correct answer from the options given below: (1) A(II), B(IV), C(I), D(III) (2) A(II), B(I), C(IV), D(III) (3) A(IV), B(I), C(III), D(II) (4) A(IV), B(III), C(I), D(II)