Practice Questions

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.The number of correct statement/s from the following is _____ . A.Larger the activation energy, smaller is the value of the rate constant. B. The higher is the activation energy, higher is the value of the temperature coefficient. C. At lower temperatures, increase in temperature causes more change in the value of k than at higher temperature. D. A plot of ln k vs 1 is a straight line with slope equal to -Ea T R

Q58.Among the following, the number of tranquilizer/s is/are A. Chloroliazepoxide B. Veronal C. Valium D. Salvarsan

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

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.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.The volume (in mL) of 0. 1 M AgNO3 required for complete precipitation of chloride ions present in 20 mL of 0. 01 M solution of [Cr (H2O)5 Cl] Cl2 as silver chloride is_______

Q59.The number of incorrect statement/s from the following is ______________ A. The successive half lives of zero order reactions decreases with time. B. A substance appearing as reactant in the chemical equation may not affect the rate of reaction C. Order and molecularity of a chemical reaction can be a fractional number JEE Main 2023 (10 Apr Shift 2) JEE Main Previous Year Paper D. The rate constant units of zero and second order reaction are molL -1 s-1 and mol-1 L s-1 respectively

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 (Name of polymer) List II (Uses) A Glyptal I Flexible pipes B Neoprene II Synthetic wool C Acrilan III Paints and Lacquers D LDP IV Gaskets Choose the correct answer from the options given below :- (1) A −III, B −II, C −IV, D −I (2) A −III, B −IV, C −II, D −I (3) A −III, B −IV, C −I, D −II (4) A −III, B −I, C −IV, D −II

Q59.Compoun ′B′ is (1) (2) (3) (4)

Q59.Match List I with List II List I List II Antimicrobials Names (A) Narrow Spectrum (I) Furacin Antibiotic (B) Antiseptic (II) Sulphur dioxide (C) Disinfectants (III) Penicillin-G (D) Broad spectrum antibiotic (IV) Chloramphenicol (1) (A) - III, (B) - I, (C) - II, (D) - IV (2) (A) - I, (B) - II, (C) - IV, (D) - III (3) (A) - II, (B) - I, (C) - IV, (D) - III (4) (A) - III, (B) - I, (C) - IV, (D) - II JEE Main 2023 (29 Jan Shift 1) JEE Main Previous Year Paper

Q59.The number of electrons involved in the reduction of permanganate to manganese dioxide in acidic medium is _____ .

Q59.The ratio of spin-only magnetic moment values 3 - + μeffCr ( CN ) 6 / μeffCrH2O63 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)

Q59.A molecule undergoes two independent first order reactions whose respective half lives are 12 min and 3 min. If both the reactions are occurring then the time taken for the 50% consumption of the reactant is ______ min. (Nearest integer)

Q59.The oxidation sate of phosphorus in hypophosphoric acid is

Q59.Sum of oxidation states of bromine in bromic acid and perbromic acid is JEE Main 2023 (01 Feb Shift 1) JEE Main Previous Year Paper

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