Practice Questions

Q39.Nitrogen gas is obtained by thermal decomposition of: (1) NaNO2 (2) NaNO3 (3) Ba (N3)2 (4) Ba (NO3)2

Q39.Halogenation of which one of the following will yield m-substituted product with respect to methyl group as a major product? (1) (2) (3) (4)

Q39.Arrange the following in increasing order of reactivity towards nitration A. p-xylene B. bromobenzene C. mesitylene D. nitrobenzene E. benzene Choose the correct answer from the options given below (1) C < D < E < A < B (2) D < B < E < A < C (3) D < C < E < A < B (4) C < D < E < B < A

Q39.Which of the following carbocations is most stable: (1) (2) (3) (4)

Q39.Two isomers ' A' and ' B' with molecular formula C4H8 give different products on oxidation with KMnO4 in acidic medium. Isomer ' A' on reaction with KMnO4 /H+ results in effervescence of a gas and gives ketone. The compound ' A' is (1) But- 1-ene. (2) cis-But- 2-ene. (3) trans-But- 2-ene. (4) 2-methyl propene. JEE Main 2022 (29 Jun Shift 1) JEE Main Previous Year Paper

Q39.Which of the following reagents / reactions will convert ' A' to ' B'? (1) PCC oxidation (2) Ozonolysis (3) BH3, H2O2/ −OH followed by PCC oxidation (4) HBr, hydrolysis followed by oxidation by K2 Cr2 O7 .

Q39.Match List I with List II. List-I List-II A Sulphate I Pesticide B Fluoride II Bending of bones C Nicotine III Laxative effect D Sodium arsinite IV Herbicide Choose the correct answer from the options given below (1) A −II, B −III, C −IV, D −I (2) A −III, B −II, C −I, D −IV (3) A −IV, B −III, C −II, D −I (4) A −III, B −II, C −IV, D −I

Q39.In Carius method of estimation of halogen. 0. 45 g of an organic compound gave 0. 36 g of AgBr. Find out the percentage of bromine in the compound. (Molar masses : AgBr = 188 g mol−1 : Br = 80 g mol−1 ) (1) 34. 04% (2) 40. 04% (3) 36. 03% (4) 38. 04%

Q39.Which of the following is not an example of benzenoid compound? (1) (2) (3) (4)

Q39.Correct statement about photo-chemical smog is (1) It occurs in humid climate. (2) It is a mixture of smoke, fog and SO2 . (3) It is reducing smog. (4) It results from reaction of unsaturated hydrocarbons.

Q39.The correct stability order of the following diazonium salt is (1) (A) > (B) > (C) > (D) (2) (A) > (C) > (D) > (B) (3) (C) > (A) > (D) > (B) (4) (C) > (D) > (B) > (A) Q40. ˙Cl + CH4 →A + B A and B in the above atmospheric reaction step are (1) C2H6 and Cl2 (2) ˙C HCl2 and H2 (3) CH3˙ and HCl (4) C2H6 and HCl

Q39.A compound 'A' on reaction with 'X' and 'Y produces the same major product but different by product 'a' and 'b'. Oxidation of 'a' gives a substance produced by ants. JEE Main 2022 (25 Jul Shift 1) JEE Main Previous Year Paper ​ 'X' and 'Y' respectively are (1) KMnO4 / H+and dil. KMnO4, 273 K (2) KMnO4,(dilute), 273 K and KMnO4 / H+ (3) KMnO4 / H+ and O3, H2O / Zn (4) O3, H2O / Zn and KMnO4 / H+

Q39.Solute A associates in water. When 0 . 7 g of solute A is dissolved in 42 . 0 g of water, it depresses the freezing point by 0 . 2 °C. The percentage association of solute A in water, is [Given: Molar mass of A = 93 g mol-1. Molal depression constant of water is 1 . 86 K kg mol-1] (1) 50% (2) 60% (3) 70% (4) 80%

Q39.Correct structure of γ-methylcyclohexane carbaldehyde is (1) (2) (3) (4)

Q40.The gas produced by treating an aqueous solution of ammonium chloride with sodium nitrite is (1) NH3 (2) N2 (3) N2O (4) Cl2

Q40.Identify the correct statement for the below given transformation. (1) A - CH3CH2CH = CH - CH3, (2) A - CH3CH2CH = CH - CH3, B - CH3CH2CH2CH = CH2, Saytzeff products B - CH3CH2CH2CH = CH2, Hafmann products (3) A - CH3CH2CH2CH = CH2, (4) A - CH3CH2CH2CH = CH2, B - CH3CH2CH = CHCH3, B - CH3CH2CH = CHCH3, Hofmann products Saytzeff products

Q40.Consider the following reaction : (1) Electrolysis 2 HSO−4 (aq) (2) Hydrolysis 2 HSO−4 + 2H+ + A The dihedral angle in product A in its solid phase at 110 K is (1) 104° (2) 111. 5° (3) 90. 2° (4) 111. 0°

Q40.Incorrect statement for Tyndall effect is (1) The refractive indices of the dispersed phase and (2) The diameter of the dispersed particles is much the dispersion medium differ greatly in smaller than the wavelength of the light used. magnitude. (3) It is used to distinguish a true solution from a (4) During projection of movies in the cinemas hall, colloidal solution. Tyndall effect is noticed.

Q40.Match List - I with List - II : List-I List-II (A) Sphalerite (I) FeCO3 (B) Calamine (II) PbS (C) Galena (III) ZnCO3 (D) Siderite (IV) ZnS Choose the most appropriate answer from the options given below : (1) (A) −(IV), (B) −(I), (C) −(II), (D) −(III) (2) (A) −(IV), (B) −(III), (C) −(II), (D) −(I) (3) (A) −(II), (B) −(II), (C) −(I), (D) −(IV) (4) (A) −(III), (B) −(IV), (C) −(II), (D) −(I)

Q40.Sulphur dioxide is one of the components of polluted air. SO2 is also a major contributor to acid rain. The correct and complete reaction to represent acid rain caused by SO2 is : (1) 2 SO2 + O2 →2 SO3 (2) SO2 + O3 →SO3 + O2 (3) SO2 + H2O2 →H2 SO4 (4) 2 SO2 + O2 + 2H2O →2H2 SO4 Q41. 42. 12% (w/v) solution of NaCl causes precipitation of a certain sol in 10 hours. The coagulating value of NaCl for the sol is [Given : Molar mass : Na = 23. 0 g mol−1; Cl = 35. 5 g mol−1 ] (1) 36 mmolL−1 (2) 36 mol L−1 (3) 1440 mol L−1 (4) 1440 m molL−1

Q40.Some gases are responsible for heating of atmosphere (green house effect). Identify from the following the gaseous species which does not cause it. (1) H2O vapour (2) O3 (3) N2 (4) CH4

Q40.The acid that is believed to be mainly responsible for the damage of Taj Mahal is (1) sulfuric acid. (2) hydrofluoric acid. (3) phosphoric acid. (4) hydrochloric acid.

Q40.The correct order of reduction potentials of the following pairs is A. Cl2 / Cl- B. I2 / I- C. Ag+ / Ag D. Na+ / Na E. Li+ / Li Choose the correct answer from the options given below. (1) A > B > C > E > D (2) A > C > B > E > D (3) A > B > C > D > E (4) A > C > B > D > E

Q40.Match List-I with List-II List-I List-II (A) negatively charged sol (I) Fe2 O3 ⋅xH2 O (B) macromolecular colloid (II) CdS sol (C) positively charged sol (III) Starch (D) Cheese (IV) a gel Choose the correct answer from the options given below JEE Main 2022 (28 Jun Shift 2) JEE Main Previous Year Paper (1) (A) −(II), (B) −(III), (C) −(IV), (D) −(I) (2) (A) −(II), (B) −(I), (C) −(II), (D) −(IV) (3) (A) −(II), (B) −(III), (C) −(I), (D) −(IV) (4) (A) −(I), (B) −(III), (C) −(II), (D) −(IV)

Q40.Match List - I with List - II. JEE Main 2022 (27 Jun Shift 1) JEE Main Previous Year Paper List-I List-II A Lyophilic colloid I Liquid-liquid colloid B Emulsion II Protective colloid C Positively charged colloid III FeCl3 + NaOH D Negatively charged colloid IV FeCl3+ hot water Choose the correct answer from the options given below (1) (A) −(II), (B) −(I), (C) −(IV), (D) −(III) (2) (A) −(III), (B) −(I), (C) −(IV), (D) −(II) (3) (A) −(II), (B) −(I), (C) −(III), (D) −(IV) (4) (A) −(III), (B) −(II), (C) −(I), (D) −(IV)