Practice Questions

Q50.The number of colloidal systems from the following, which will have 'liquid' as the dispersion medium, is _____. Gem stones, paints, smoke, cheese, milk, hair cream, insecticide sprays, froth, soap lather

Q50.Match List I and List II List I List II Functional group / Test Class of Compound (A) Molisch's Test (I)Peptide (B) Biuret Test (II)Carbohydrate (C) Carbylamine Test (III) Primary amine (D) Schiff's Test (IV) Aldehyde Choose the correct answer from the options given below: (1) (A) - I, (B) - II, (C) - III, (D) - IV (2) (A) - III, (B) - IV, (C) -I, (D) - II (3) (A) - II, (B) - I, (C) - III, (D) - IV (4) (A) - III, (B) - IV, (C) -II, (D) - I

Q50.Match the List-I with List-II : Cations Group reaction P →Pb2+, Cu2+ H2 S gas in presence of dilute HCl Q →Al3+, Fe3+ (NH4)2 CO3 in presence of NH4 OH R →Co2+, Ni2+ NH4 OH in presence of NH4 CI S →Ba2+, Ca2+ H2 S in presence of NH4 OH (1) P →i, Q →iii, R →ii, S →iv (2) P →iv, Q →ii, R →iii, S →i (3) P →iii, Q →i, R →iv, S →ii (4) P →i, Q →iii, R →iv, S →ii

Q50.Which one of the following is most likely a mismatch? JEE Main 2023 (13 Apr Shift 1) JEE Main Previous Year Paper (1) Zinc-Liquation (2) Copper-Electrolysis (3) Nickel-Mond process (4) Titanium-van Arkel Method

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.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.Given below are two statements : Statement I : Noradrenaline is a neurotransmitter. Statement II : Low level of noradrenaline is not the cause of depression in human. In the light of the above statements, choose the correct answer from the options given below (1) Both statement 1 and 2 are correct.. (2) Statement 1 is correct but statement 2 is incorrect (3) Statement 1 is incorrect but statement 2 is correct (4) Both statement 1 and 2 are correct

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.Coagulating value of the electrolytes AlCl3 and NaCl tor As2 S3 are 0. 09 and 50. 04 respectively. The coagulating power of AlCl3 is x times the coagulating power of NaCl. The value of x is

Q50.A chloride salt solution acidified with dil. HNO3 gives a curdy white precipitate, [A], on addition of AgNO3 . [A] on treatment with NH4 OH gives a clear solution, B. (1) H[AgCl3]&[Ag (NH3)2] Cl (2) H[AgCl3] & (NH4)[Ag(OH)2] (3) AgCl & [Ag (NH3)2] Cl (4) AgCl & (NH4)[Ag(OH)2]

Q50.Which one amongst the following are good oxidising agents? (a) Sm2+ (b) Ce2+ (c) Ce4+ (d) Tb4+ Choose the most appropriate answer from the options given below : (1) C only (2) D only (3) A and B only (4) C and D only

Q50.Four gases, A, B, C and D have critical temperatures 5. 3, 33. 2, 126. 0 and 154. 3K respectively For their adsorption on a fixed amount of charcoal, the correct order is : (1) C > D > B > A (2) C > B > D > A (3) D > C > B > A (4) D > C > A > B

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.Which of the following salt solutions would coagulate the colloid soloution formed when FeCl3 is added to NaOH solution, at the fastest rate? (1) 10 mL of 0. 2 mol dm−3 AlCl3 (2) 10 mL of 0. 1 mol dm−3 Na2 SO4 (3) 10 mL of 0. 1 mol dm−3 Ca3 (PO4)2 (4) 10 mL of 0. 15 mol dm−3 CaCl2

Q50.In figure, a straight line is given for Freundrich Adsorption (y = 3x + 2. 505). The value of n1 and logK are respectively. JEE Main 2023 (01 Feb Shift 2) JEE Main Previous Year Paper (1) 0. 3 and log 2. 505 (2) 0. 3 and 0. 7033 (3) 3 and 2. 505 (4) 3 and 0. 7033

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.

Q50. XeF4 reacts with SbF5 to form [XeFm]n+[SbFy]2− m + n + y + z = ? .

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

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.Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A: In the Ellingham diagram, a sharp change in slope of the line is observed from Mg →MgO at ~1120oC Reason R: There is a large change of entropy associated with the change of state In the light of the above statements, choose the correct answer from the options given below (1) Both A and R are true but R is NOT the correct (2) A is false but R is true explanation of A (3) Both A and R are true and R is the correct (4) A is true but R is false explanation of A

Q51.Given below are two statements, one is labelled as Assertion A and the other is labelled as Reasom R. Assertion A: A solution of the product obtained by heating a mole of glycine with a mole of chlorine in presence of red phosphorous generates chiral carbon atom. Reason R: A molecule with 2 chiral carbons is always optically active. In the light of above statements, chose the correct answer from the options given below: (1) A is true but R is false (2) Both A and R are true but R is the correct explaination of A (3) A is false but R is true (4) Both A and R are true but R is NOT the correct explaination of A

Q51. K2 Cr2 O7 paper acidified with dilute H2 SO4 turns green when exposed to (1) Carbon dioxide (2) Sulphur trioxide (3) Hydrogen sulphide (4) Sulphur dioxide

Q51.The set of correct statements is: (i) Manganese exhibits +7 oxidation state in its oxide. (ii) Ruthenium and Osmium exhibit +8 oxidation in their oxides. (iii) Sc shows +4 oxidation state which is oxidizing in nature. (iv) Cr shows oxidising nature in +6 oxidation state. (1) (ii) and (iii) (2) (i), (ii) and (iv) (3) (i) and (iii) (4) (ii), (iii) and (iv)

Q51.The number of paramagnetic species from the following is [Ni(CN)4]2−, [Ni(CO)4], [NiCl4]2− [Fe(CN)6]4−, [Cu (NH3)4]2+ [Fe(CN)6]3− and [Fe (H2O)6]2+

Q51.The reaction representing the Mond process for metal refining is ______ (1) Δ (2) Δ Ni + 4CO 2K[Au(CN)2] + Zn →K2[Zn(CN)4] + 2 Au →Ni(CO)4 (3) Δ (4) Δ Zr + 2I2 →ZrI4 ZnO + C →Zn + CO Q52.“ A ” obtained by Ostwald's method involving air oxidation of NH3 , upon further air oxidation produces “ B ”. “ B ” on hydration forms an oxoacid of Nitrogen along with evolution of “ A ”. The oxoacid also produces “ A ” and gives positive brown ring test (1) NO2, N2O5 (2) NO2, N2O4 (3) NO, NO2 (4) N2O3, NO2