Practice Questions

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).

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

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.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 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

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.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.The oxidation sate of phosphorus in hypophosphoric acid is

Q59.The ratio of spin-only magnetic moment values 3 - + μeffCr ( CN ) 6 / μeffCrH2O63 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.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.In ammonium - phosphomolybdate, the oxidation state of Mo is +_______ JEE Main 2023 (06 Apr Shift 1) JEE Main Previous Year Paper

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

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

Q60.A ( g ) →2 B ( g ) + C ( g ) is a first order reaction. The initial pressure of the system was found to be 800 mm Hg which increased to 1600 mm Hg after 10 min. The total pressure of the system after 30 min will be mm Hg. (Nearest integer)

Q60.In an oligopeptide named Alanylglycylphenyl alanyl isoleucine, the number of sp2 hybridised carbons is _____. is equal to

Q60.The homoleptic and octahedral complex of Co2+ and H2O has ______ unpaired electron(s) in the t2g set of orbitals.

Q60.The difference in the oxidation state of Xe between the oxidised product of Xe formed on complete hydrolysis of XeF4and XeF4 is 2𝑧- 3𝑖

Q60. The ratio x/y on completion of the above reaction is ______ . JEE Main 2023 (11 Apr Shift 1) JEE Main Previous Year Paper 𝑥- 7 2

Q60.A trisubstituted compound 'A', C10H12O2 gives neutral FeCl3 test positive. Treatment of compound 'A' with NaOH and CH3Br gives C11H14O2, with hydroiodic acid gives methyl iodide and with hot conc. NaOH gives a compound B, C10H12O2. Compound 'A' also decolorises alkaline KMnO4. The number of 𝜋 bond/s present in the compound 'A' is _____ .

Q60.How many of the transformation given below would result in aromatic amines? JEE Main 2023 (31 Jan Shift 1) JEE Main Previous Year Paper

Q60.Number of ambidentate ligands in a representative metal complex M ( en ) ( SCN ) is _________ . [en = 4 ethylenediamine]

Q60.Number of isomeric compounds with molecular formula C9H10O which (i) do not dissolve in NaOH (ii) do not dissolve in HCl. (iii) do not give orange precipitate with 2, 4 - DNP (iv) on hydrogenation give identical compound with molecular formula C9H12O is