Practice Questions

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.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.The eutrophication of water body results in (1) Increase in biodiversity (2) Loss in biodiversity (3) Break down of organic matter (4) decrease in BOD.

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.Choose the correct option for the following reactions. (1) 'A' and 'B' are both Markovnikov addition (2) 'A' is Markovnikov product and 'B' is products. antiMarkovnikov product. (3) 'A' and 'B' are both anti-Markovnikov products. (4) 'B' is Markovnikov and 'A' is anti- Markovnikov product.

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

Q39.Statement I: Leaching of gold with cyanide ion in absence of air / O2 leads to cyano complex of Au(III). JEE Main 2022 (27 Jun Shift 2) JEE Main Previous Year Paper Statement II: Zinc is oxidized during the displacement reaction carried out for gold extraction. In the light of the above statements, choose the correct answer from the options given below. (1) Both Statement 1 and statement 2 are correct (2) Both Statement 1 and statement 2 are incorrect (3) Statement 1 is correct but statement 2 is incorrect (4) Statement 1 is incorrect but statement 2 is correct

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.Given below are two statements : Statement I : According to the Ellingham diagram, any metal oxide with higher ΔG° is more stable than the one with lower ΔG° . Statement II : The metal involved in the formation of oxide placed lower in the Ellingham diagram can reduce the oxide of a metal placed higher in the diagram. In the light of the above statements, choose the most appropriate answer from the options given below (1) Both Statement I and Statement II are correct. (2) Both Statement I and Statement II are incorrect. (3) Statement I is correct but Statement II is (4) Statement I is incorrect but Statement II is incorrect. correct.

Q39.Given below are two statements: Statement I : Emulsions of oil in water are unstable and sometimes they separate into two layers on standing. Statement II : For stabilisation of an emulsion, excess of electrolyte is added. In the light of the above statements, choose the most appropriate answer from the options given below : (1) Both Statement I and Statement II are correct. (2) Both Statement I and Statement II are incorrect. (3) Statement I is correct but Statement II is (4) Statement I is incorrect but Statement II is incorrect. correct.

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

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

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.Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A : Dissolved substances can be removed from a colloidal solution by diffusion through a parchment paper. Reason R : Particles in a true solution cannot pass through parchment paper but the collodial particles can pass through the parchment paper. In the light of the above statements, choose the correct answer from the options given below (1) Both A and R are correct and R is the correct (2) Both A and R are correct but R is not the correct explanation of A explanation of A (3) A is correct but R is not correct (4) A is not correct but R is correct

Q40.White phosphorus reacts with thionyl chloride to give (1) PCl5, SO2 and S2 Cl2 (2) PCl3, SO2 and S2 Cl2 (3) PCl3, SO2 and Cl2 (4) PCl5, SO2 and Cl2

Q40.Match List I with List II List-I List-II Pollutant Source A Microorganisms I Strip mining B Plant nutrients II Domestic sewage C Toxic heavy metals III Chemical fertilizer D Sediment IV Chemical factory Choose the correct answer from the options given below (1) A - II, B - III, C - IV, D - I (2) A - II, B - I, C - IV, D - III (3) A - I, B - IV, C - II, D - III (4) A - I, B - IV, C - III, D - II

Q40.Match List I with List II List-I List-II Pollutant Disease /sickness A Sulphate (> 500 ppm) I Methemoglobinemia B Nitrate (> 50 ppm) II Brown mottling of teeth C Lead (> 50 ppb) III Laxative effect D Fluoride (> 2 ppm) IV Kidney damage Choose the correct answer from the options given below (1) A −IV, B −I, C −II, D −III (2) A −III, B −I, C −IV, D −II (3) A −II, B −IV, C −I, D −III (4) A −II, B −IV, C −III, D −I

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)

Q40.Two solutions A and B are prepared by dissolving 1 g of non-volatile solutes X and Y. respectively in 1 kg of water. The ratio of depression in freezing points for A and B is found to be 1 : 4. The ratio of molar masses of X and Y is (1) 1 : 4 (2) 1 : 0. 25 (3) 1 : 0. 20 (4) 1 : 5

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.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.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.Given below are two statements. Statement I : The compound is optically active. Statement II : ​ is mirror image of above compound A. In the light of the above statement, choose the most appropriate answer from the options given below. JEE Main 2022 (29 Jul Shift 2) JEE Main Previous Year Paper (1) Both Statement I and Statement II are correct (2) Both Statement I and Statement II are incorrect. (3) Statement I is correct but Statement II is (4) Statement I is incorrect but Statement II is incorrect. correct.