Practice Questions

Q38.Which of the following reaction is correct? (1) Δ (2) Δ 2 LiNO3 →2 LiNO2 + O2 4 LiNO3 →2 Li2 O + 2N2O4 + O2 (3) Δ (4) Δ 4 LiNO3 →2 Li2 O + 4 NO2 + O2 2 LiNO3 →2Li + 2 NO2 + O2

Q38.During the reaction of permanganate with thiosulphate, the change in oxidation of manganese occurs by value of 3. Identify which of the below medium will favour the reaction. (1) Both aqueous acidic and neutral (2) Aqueous neutral (3) Both aqueous acidic and faintly alkaline (4) Aqueous acidic

Q38.Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Order of acidic nature of the following compounds is A > B > C. Reason R: Fluoro is a stronger electron withdrawing group than Chloro group. 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 correct and R is the correct explanation of A (3) A is true but R is false (4) Both A and R are correct but R is NOT the correct explanation of A

Q38.In which of the following reactions the hydrogen peroxide acts as a reducing agent? (1) PbS + 4H2O2 →PbSO4 + 4H2O (2) 2 Fe2+ + H2O2 →2 Fe3+ + 2 OH− (3) HOCl + H2O2 →H3O+ + Cl−1 + O2 (4) Mn2+ + H2O2 →Mn4+ + 2 OH−

Q38.In sulphur estimation. 0. 471 g of an organic compound gave 1. 4439 g of barium sulphate. The percentage of sulphur in the compound is _______(Nearest Integer) (Given: Atomic mass Ba: 137u : S : 32u, O : 16u )

Q38.Thin layer chromatography of a mixture shows the following observation: The correct order of elution in the silica gel column chromatography is (1) B, A, C (2) B, C, A (3) A, C, B (4) C, A, B

Q38.Decreasing order of reactivity towards electrophilic substitution for the following compounds is: (1) d > a > e > c > b (2) e > d > a > b > c (3) a > d > e > b > c (4) c > b > a > d > e

Q38.In the depression of freezing point experiment A. Vapour pressure of the solution is less than that of pure solvent B. Vapour pressure of the solution is more than that of pure solvent C. Only solute molecules solidify at the freezing point D. Only solvent molecules solidify at the freezing point (1) A and D only (2) B and C only (3) A and C only (4) A only

Q38.A compound is formed by two elements X and Y . The element Y forms cubic close packed arrangement and those of element X occupy one third of the tetrahedral voids. What is the formula of the compound? (1) X2Y3 (2) X3Y2 (3) X3Y (4) XY3

Q38.The starting material for convenient preparation of deuterated hydrogen peroxide (D2O2) in laboratory is: (1) K2 S2O8 (2) 2-ethylanthraquinol (3) BaO2 (4) BaO

Q38.The decreasing order of hydride affinity for following carbocations is: (a) (2) (3) (4) Choose the correct answer from the options given below: (1) C, A, D, B (2) C, A, B, D (3) A, C, D, B (4) A, C, B, D

Q39.The methods NOT involved in concentration of ore are (A) Liquation (B) Leaching (C) Electrolysis (D) Hydraulic washing (E) Froth floatation Choose the correct answer from the options given below: (1) B, D and C only (2) C, D and E only (3) A and C only (4) B, D and E only

Q39.Boric acid in solid, whereas BF3 is gas at room temperature because of (1) Strong ionic bond in Boric acid (2) Strong van der Waal's interaction in Boric acid (3) Strong hydrogen bond in Boric acid (4) Strong covalent bond in BF3

Q39.The volume of 0. 02 M aqueous HBr required to neutralize 10. 0 mL of 0. 01 M aqueous Ba(OH)2 is (Assume complete neutralization) (1) 2. 5 mL (2) 5. 0 mL (3) 10. 0 mL (4) 7. 5 mL

Q39.Formation of photochemical smog involves the following reaction in which A, B and C are respectively. hu (i) NO2 ⟶A + B JEE Main 2023 (30 Jan Shift 1) JEE Main Previous Year Paper (ii) B + O2 →C (iii) A + C →NO2 + O2 Choose the correct answer from the options given below: (1) O, NO and NO3- (2) O, N2O and NO (3) N, O2 and O3 (4) NO, O and O3

Q39.The standard electrode potential of M+ / M in aqueous solution does not depend on (1) Hydration of a gaseous metal ion (2) Sublimation of a solid metal (3) Ionisation of a solid metal atom (4) Ionisation of a gaseous metal atom

Q39.Identify the correct statements about alkali metals. A. The order of standard reduction potential (M+ | M) for alkali metal ions is Na > Rb > Li. B. CsI is highly soluble in water. C. Lithium carbonate is highly stable to heat. D. Potassium dissolved in concentrated liquid ammonia is blue and paramagnetic. E. All alkali metal hydrides are ionic solids. Choose the correct answer from the options given below (1) A, B, D only (2) C and E only (3) A and E only (4) A, B and E only

Q39.Arrange the following compounds in increasing order of rate of aromatic electrophilic substitution reaction. (1) d, b, c, a (2) d, b, a, c (3) b, c, a, d (4) c, a, b, d

Q39.The product formed in the following multistep reaction is: (1) (2) (3) (4)

Q39.Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Gypsum is used for making fireproof wall boards. Reason (R): Gypsum is unstable at high temperatures. In the light of the above statements, choose the correct answer from the options given below: (1) Both (A) and (R) are correct but (R) is not the (2) (A) is correct but (R) is not correct. correct explanation of (A). (3) (A) is not correct but (R) is correct. (4) Both (A) and (R) are correct and (R) is the correct explanation of (A).

Q39.Alkali metal from the following with least melting point is (1) Cs (2) Rb (3) Na (4) K

Q39.Which of the following represents the correct order of metallic character of the given elements? (1) Si < Be < Mg < K (2) Be < Si < Mg < K (3) K < Mg < Be < Si (4) Be < Si < K < Mg

Q39.Match List I with List II List I List II Type of Hydride Example A Electron deficient hydride I MgH2 B Electron rich hydride II HF C Electron precise hydride III B2H6 D Saline hydride IV CH4 Choose the correct answer from the options given below : (1) A-III, B-II, C-IV, D-I (2) A-II, B-III, C-I, D-IV (3) A-II, B-III, C-IV, D-I (4) A-III, B-II, C-I, D-IV

Q39.The magnetic behaviour of Li2 O, Na2 O2 and KO2 , respectively, are (1) diamagnetic, paramagnetic and diamagnetic (2) paramagnetic, paramagnetic and diamagnetic (3) paramagnetic, diamagnetic and paramagnetic (4) diamagnetic, diamagnetic and paramagnetic

Q39.The major product 'P' formed in the given reaction is JEE Main 2023 (10 Apr Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)