Practice Questions

Q50.Match List I and List II List I List II Vitamin Deficiency disease A Vitamin A I Beri-Beri B Thiamine II Cheilosis C Ascorbic acid III Xerophthalmia D Riboflavin IV Scurvy Choose the correct answer from the options given below (1) A - III, B - I, C - IV, D - II (2) A - IV, B - I, C - III, D - II (3) A - IV, B - II, C - III, D - I (4) A - III, B - II, C - IV, D - I JEE Main 2023 (06 Apr Shift 1) JEE Main Previous Year Paper

Q50.Given below are two statements: Statement I: In the metallurgy process,sulphide ore is converted to oxide before reduction. Statement II: Oxide ores in general are easier to reduce. In the light of the above statements, choose the most appropriate answer from the options given below: (1) Statement I is correct but Statement II is (2) Both Statement I and Statement II are incorrect incorrect (3) Statement I is incorrect but Statement II is (4) Both Statement I and Statement II are correct correct

Q50.The reaction used for preparation of soap from fat is : (1) An addition reaction (2) Reduction reaction (3) Alkaline hydrolysis reaction (4) An oxidation reaction

Q50.The one that does not stabilize 2∘ and 3∘ structures of proteins is (1) – S – S – linkage (2) H - bonding (3) – O – O – linkage (4) van der Waals forces

Q50.A protein ‘X’ with molecular weight of 70, 000 u, on hydrolysis gives amino acids. One of these amino acid is (1) (2) (3) (4)

Q50.The naturally occurring amino acid that contains only one basic functional group in its chemical structure is (1) asparagine (2) histidine (3) arginine (4) lysine Q51.1 g of a carbonate M2CO3 on treatment with excess HCl produces 0 . 01 mol of CO2. The molar mass of M2CO3 is gmol-1. (Nearest integer) x is (nearest integer)

Q50.A solution of CrO5 in amyl alcohol has a....colour (1) Green (2) Orange-Red (3) Yellow (4) Blue

Q50.Which is not true for arginine? (1) It has a fairly high melting point (2) It is associated with more than one pKa values. (3) It has high solubility in benzene. (4) It is a crystalline solid.

Q51.If wavelength of the first line of the Paschen series of hydrogen atom is 720 nm, then the wavelength of the second line of this series is _______ nm. (Nearest integer)

Q51.If 5 moles of BaCl2 is mixed with 2 moles of Na3PO4, the maximum number of moles of Ba3PO42formed is _________ (Nearest integer)

Q51.The energy of one mole of photons of radiation of frequency 2 × 1012 Hz in Jmol-1 is _____ . (Nearest integer) (Given: h = 6 . 626 × 10-34Js NA = 6 . 022 × 1023 mol-1)

Q51.Formulae for Nessler's reagent is: (1) KHg2 I2 (2) KHgI3 (3) K2 HgI4 (4) HgI2

Q51.In Hall-Heroult process, the following is used for reducing Al2 O3 :- (1) Magnesium (2) Na3 AlF6 (3) Graphite (4) CaF2

Q51.The IUPAC name of K3[Co(C2O4)3] is: (1) Potassium tris(oxalato)cobaltate (III) (2) Potassium tris(oxalato)cobalt (III) (3) Potassium trioxalatocobalt (III) (4) Potassium trioxalatocobaltate (III)

Q51.A solution of sugar is obtained by mixing 200 g of its 25% solution and 500 g of its 40 % solution (both by mass). The mass percentage of the resulting sugar solution is _______ (Nearest integer) JEE Main 2023 (11 Apr Shift 1) JEE Main Previous Year Paper

Q51.Potassium dichromate acts as a strong oxidizing agent in acidic solution. During this process, the oxidation state changes from (1) +3 to +1 (2) +6 to +3 (3) +2 to +1 (4) +6 to +2

Q51.Among following compounds, the number of those present in copper matte is A. CuCO3 B. Cu2 S C. Cu2 O D. FeO

Q52.When 2 litre of ideal gas expands isothermally into vacuum to a total volume of 6 litre, the change in internal energy is _____ J. (Nearest integer) Q53.600mL of 0 . 01M HCl is mixed with 400mL of 0 . 01M H2SO4. The pH of the mixture is _____ × 10-2. (Nearest integer) [Given log2 = 0 . 30, log3 = 0 . 48, log5 = 0 . 69, log7 = 0 . 84, log11 = 1 . 04]

Q52.For a metal ion, the calculated magnetic moment is 4 . 90 BM. This metal ion has _______ number of unpaired electrons

Q52.The orbital angular momentum of an electron in 3 s orbital is 2π.xh The value of Q53.20 mL of 0 . 1MNaOH is added to 50 mL of 0 . 1M acetic acid solution. The pH of the resulting solution is × 10-2. (Nearest integer) Given : pK𝑎CH3COOH = 4 . 76 log 2 = 0 . 30 log 3 = 0 . 48

Q53.In the cumene to phenol preparation in presence of air, the intermediate is (1) (2) (3) (4)

Q53.Which element is not present in Nessler’s reagent? (1) Mercury (2) Potassium (3) Iodine (4) Oxygen

Q53.Element not present in Nessler’s reagent is (1) N (2) Hg (3) I (4) K

Q53.The denticity of the ligand present in the Fehling's reagent is _____ .

Q53.The total change in the oxidation state of manganese involved in the reaction of KMnO4 and potassium iodide in the acidic medium is ________.