Practice Questions

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.The photochemical smog does not generally contain (1) NO (2) NO2 (3) SO2 (4) HCHO

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.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.In metallurgy the term "gangue" is used for (1) Contamination of undesired earthy materials. (2) Contamination of metals, other than desired metal (3) Minerals which are naturally occuring in pure (4) Magnetic impurities in an ore. form

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

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

Q41.The depression in freezing point observed for a formic acid solution of concentration 0 . 5 mL L-1 is 0 . 0405 °C. Density of formic acid is 1 . 05 g mL-1. The Van't Hoff factor of the formic acid solution is nearly: (Given for water kf = 1 . 86 K kg mol-1) (1) 0 . 8 (2) 1 . 1 (3) 1 . 9 (4) 2 . 4

Q41.Dihydrogen reacts with CuO to give (1) Cu (OH)2 (2) Cu(s) (3) Cu2 O (4) CuH2

Q41.Concentrated HNO3 reacts with Iodine to give (1) HI, NO2 and H2O (2) HIO2, N2O and H2O (3) HIO3, NO2 and H2O (4) HIO4, N2O and H2O

Q41.In following pairs, the one in which both transition metal ions are colourless is (1) Sc3+, Zn2+ (2) Ti4+, Cu2+ (3) V2+, Ti3+ (4) Zn2+, Mn2+

Q41.Which of the following is a correct statement? (1) Brownian motion destabilises sols. (2) Any amount of dispersed phase can be added to emulsion without destabilising it. (3) Mixing two oppositely charged sols in equal (4) Presence of equal and similar charges on amount neutralises charges and stabilises colloidal particles provides stability to the colloids. colloidal solution.

Q41.The correct order of melting points of hydrides of group 16 elements is (1) H2S < H2Se < H2Te < H2O (2) H2O < H2S < H2Se < H2 Te (3) H2S < H2Te < H2Se < H2O (4) H2Se < H2S < H2Te < H2O

Q41.The role of depressants in 'Froth Floation method' is to JEE Main 2022 (26 Jun Shift 2) JEE Main Previous Year Paper (1) selectively prevent one component of the ore (2) reduce the consumption of oil for froth from coming to the froth. formation. (3) stabilize the froth. (4) enhance non-wettability of the mineral particles.

Q41.Boiling point of a 2% aqueous solution of a nonvolatile solute A is equal to the boiling point of 8% aqueous solution of a non-volatile solute B . The relation between molecular weights of A and B is. JEE Main 2022 (27 Jul Shift 1) JEE Main Previous Year Paper (1) MA = 4MB (2) MB = 4MA (3) MA = 8MB (4) MB = 8MA

Q41.In neutral or alkaline solution, MnO−4 oxidises thiosulphate to (1) S2O2−7 (2) S2O2−8 (3) SO2−3 (4) SO2−4

Q41.Match List - I with List - II. List-I List-II A Concentration of gold ore I Aniline B Leaching of alumina II NaOH C Froth stabiliser III SO2 D Blister copper IV NaCN Choose the correct answer from the options given below. (1) (A) −(IV), (B) −(III), (C) −(II), (D) −(I) (2) (A) −(IV), (B) −(II), (C) −(I), (D) −(III) (3) (A) −(III), (B) −(II), (C) −(I), (D) −(IV) (4) (A) −(II), (B) −(IV), (C) −(III), (D) −(I)

Q41.Given below are the oxides : Na2 O, As2 O3, N2O, NO and Cl2 O7 Number of amphoteric oxides is : (1) 0 (2) 1 (3) 2 (4) 3

Q41.In the industrial production of which of the following, molecular hydrogen is obtained as a bye product. (1) Na2 CO3 (2) NaOH (3) Na metal (4) NaHCO3

Q41.The molar conductivity of a conductivity cell filled with 10 moles of 20 mL NaCl solution is Λm1 and that of 20 moles another identical cell heaving 80 mL NaCl solution is Λm2 , The conductivities exhibited by these two cells are same. The relationship between Λm2 and Λm1 is (1) Λm2 = 2Λm1 (2) Λm2 = Λm1/2 (3) Λm2 = Λm1 (4) Λm2 = 4Λm1

Q41.Leaching of gold with dilute aqueous solution of NaCN in presence of oxygen gives complex A, which on reaction with zinc forms the elemental gold and another complex B. A and B, respectively are (1) AuCN2 - and ZnCN4 2 - (2) AuCN4 - and ZnCN2OH2 2 - (3) AuCN2 - and ZnOH4 2 - (4) AuCN4 2 - and ZnCN6 4 -

Q41.Given below are two statements. Statement I: During electrolytic refining. blister copper deposits precious metals. Statement II: In the process of obtaining pure copper by electrolysis method, copper blister is used to make the anode. 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) Both Statement I and Statement II are false. (3) Statement I is true but Statement II is false. (4) Statement I is false but Statement II is true.

Q41.The major product formed in the given reaction is: JEE Main 2022 (26 Jul Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q41.At 30 °C, the half life for the decomposition of AB2 is 200 s and is independent of the initial concentration of AB2. The time required for 80% of the AB2 to decompose is (Given: log2 = 0 . 30; log3 = 0 . 48) (1) 200s (2) 323s (3) 467s (4) 532s