Practice Questions

Q49.The statement/s which are true about antagonists from the following is/are: A. They bind to the receptor site. B. Get transferred inside the cell for their action. C. Inhibit the natural communication of the body. D. Mimic the natural messenger. Choose the correct answer from the options given below: (1) B only (2) A, C and D (3) A and C (4) A and B

Q49.The reaction 2NO + Br2 →2 NOBr takes place through the mechanism given below NO + Br2 ⇌NOBr2 (fast) NOBr2 + NO →2 NOBr (slow) The overall order of the reaction is _____.

Q49.Given below are two statements:- Statement I:- In froth floatation method a rotating paddle agitates the mixture to drive air out of it. Statement II:- Iron pyrites are generally avoided for extraction of iron due to environmental reasons. In the light of the above statements, choose the correct answer from the options given below:- (1) Both Statement I and Statement II are true (2) Statement I is false but Statement II is true (3) Statement I is true but Statement II is false (4) Both Statement I and Statement II are false

Q49. A →B The above reaction is of zero order. Half life of this reaction is 50 min . The time taken for the concentration of A to reduce to one-fourth of its initial value is min . (Nearest integer)

Q49.The metal which is extracted by oxidation and subsequent reduction from its ore is : (1) Al (2) Ag (3) Cu (4) Fe

Q49.What happens when a lyophilic sol is added to a lyophobic sol? (1) Film of lyophilic sol is formed over lyophobic (2) Lyophilic sol is dispersed in lyophobic sol sol (3) Film of lyophobic sol is formed over lyophilic (4) Lyophobic sol is coagulated sol

Q49.The number of correct statements about modern adsorption theory of heterogeneous catalysis from the following is ...... A. The catalyst is diffused over the surface of reactants. B. Reactants are adsorbed on the surface of the catalyst. C. Occurrence of chemical reaction on the catalyst's surface through formation of an intermediate. D. It is a combination of intermediate compound formation theory and the old adsorption theory. E. It explains the action of the catalyst as well as those of catalytic promoters and poisons.

Q49.The rate constant for a first order reaction is 20 min−1 . The time required for the initial concentration of the reactant to reduce to its 1 level is ______ × 10−2 min . (Nearest integer) 32

Q49.The graph of log mx vs log p for an adsorption process is a straight line inclined at an angle of 45° with intercept equal to 0. 6020 . The mass of gas adsorbed per unit mass of adsorbent at the pressure of 0. 4 atm is JEE Main 2023 (30 Jan Shift 2) JEE Main Previous Year Paper _____ ×10−1 (Nearest integer) Given : log 2 = 0. 3010

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.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.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.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.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.The polymer X-consists of linear molecules and is closely packed. It is prepared in the presence of trimethylammoniumpropyl and titanium tetrachloride under low pressure. The polymer X is (1) High density polythene (2) Polyacrylonitrile (3) Low density polythene (4) Polytetrafluoroethane

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.Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Ketoses give Seliwanoff’s test faster than Aldoses. Reason (R): Ketoses undergo 𝛽-elimination followed by formation of furfural. 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)

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.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.Given below are two statements: Statement I: During Electrolytic refining, the pure metal is made to act as anode and its impure metallic form is used as cathode. Statement II: During the Hall-Heroult electrolysis process, purified Al2 O3 is mixed with Na3 AlF6 to lower the melting point of the mixture. In the light of the above statements, choose the most appropriate answer from the options given below: (1) Statement I is incorrect but Statement II is (2) Both Statement I and Statement II are incorrect correct (3) Statement I is correct but Statement II is (4) Both Statement I and Statement II are correct incorrect

Q50.Match List I with List II List I List II A Physisorption I Single Layer Adsorption B Chemisorption II 20 −40 kJ mol−1 Fe(s) C III Chromatography− N2(g) + 3H2(g) → 2 NH3(g) D Analytical Application or Adsorption IV Heterogeneous catalysis Choose the correct answer from the options given below: (1) A-III, B-IV, C-I, D-II (2) A-II, B-III, C-I, D-IV (3) A-II, B-I, C-IV, D-III (4) A-IV, B-II, C-III, D-I

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

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.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

Q51.The density of 3M solution of NaCl is 1 . 0 g mL-1. Molality of the solution is ______ × 10-2 m (Nearest integer). Given: Molar mass of Na and Cl is 23 and 35 . 5 g mol-1 respectively.