Practice Questions

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

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.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

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.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.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.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.Given below are two statements : Statement I : In polluted water values of both dissolved oxygen and BOD are very low. Statement II : Eutrophication results in decrease in the amount of dissolved oxygen. 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 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.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

Q42.Consider the following reaction : A + alkali →B (Major Product) JEE Main 2022 (26 Jun Shift 1) JEE Main Previous Year Paper If B is an oxoacid of phosphorus with no P −H bond, then A is (1) White P4 (2) Red P (3) H3 PO3 (4) P2O3

Q42.Match List - I with List - II. List –I List-II (Processes/Reactions) (Catalyst) A 2 SO2(g) + O2(g) →2 SO3(g) I Fe(s) B 4 NH3(g) + 5O2(g) →4 NO(g) + 6H2O(g) II Pt(s) −Rh(s) C N2(g) + 3H2(g) →2 NH3(g) III V2O5 D Vegetable oil (l) + H2 → Vegetable ghee(s) IV Ni(s) Choose the correct answer from the options given below JEE Main 2022 (26 Jul Shift 1) JEE Main Previous Year Paper (1) (A) −(III), (B) −(I), (C) −(II), (D) −(IV) (2) (A) −(III), (B) −(II), (C) −(I), (D) −(IV) (3) (A) −(IV), (B) −(III), (C) −(I), (D) −(II) (4) (A) −(IV), (B) −(II), (C) −(III), (D) −(I)

Q42.The metal ion (in gaseous state) with lowest spin-only magnetic moment value is (1) V2 + (2) Ni2 + (3) Cr2 + (4) Fe2 + JEE Main 2022 (25 Jun Shift 2) JEE Main Previous Year Paper

Q42.On the surface of polar stratospheric clouds, hydrolysis of chlorine nitrate gives A and B while its reaction with HCl produces B and C. A. B and C are, respectively (1) HOCl, HNO3, Cl2 (2) Cl2, HNO3, HOCl (3) HClO2, HNO2, HOCl (4) HOCl, HNO2, Cl2 O

Q42.In neutral or faintly alkaline medium, KMnO4 being a powerful oxidant can oxidise, thiosulphate almost quantitatively, to sulphate. In this reaction overall change in oxidation state of manganese will be (1) 5 (2) 1 (3) 0 (4) 3

Q42.Which one of the lanthanoids given below is the most stable in divalent form? (1) Yb (Atomic Number 70) (2) Sm (Atomic Number 62) (3) Eu (Atomic Number 63) (4) Ce (Atomic Number 58)

Q42.Cerium IV has a noble gas configuration. Which of the following is correct statement about it? (1) It will prefer to gain electron and act as an (2) It will prefer to give away an electron and behave oxidizing agent as reducing agent (3) It will not prefer to undergo redox reactions. (4) It acts as both, oxidizing and reducing agent.

Q42.Dinitrogen and dioxygen the main constituents of air do not react with each other in atmosphere to form oxides of nitrogen because (1) N2 is unreactive in the condition of atmosphere. (2) Oxides of nitrogen are unstable. (3) Reaction between them can occur in the presence (4) The reaction is endothermic and require very of a catalyst. high temperature.

Q42.Low oxidation state of metals in their complexes are common when ligands (1) have good π -accepting character (2) have good σ -donor character (3) are havind good π -donating ability (4) are havind poor σ -donating ability

Q42.In isolation of which one of the following metals from their ores, the use of cyanide salt is commonly not involved? (1) Zinc (2) Silver (3) Gold (4) Copper

Q42.For a first order reaction, the time required for completion of 90% reaction is ' x ' times the half life of the reaction. The value of ' x ' is (Given: ln 10 = 2. 303 and log 2 = 0. 3010) JEE Main 2022 (24 Jun Shift 2) JEE Main Previous Year Paper (1) 1.12 (2) 2.43 (3) 3.32 (4) 33.31

Q42.Heating white phosphorus with conc. NaOH solution gives mainly (1) Na3 P and H2O (2) H3 PO and NaH (3) P(OH)3 and NaH2 PO4 (4) PH3 and NaH2 PO2

Q42.Among the given oxides of nitrogen ; N2O, N2O3, N2O4 and N2O5 , the number of compound/(s) having N −N bond is (1) 1 (2) 2 (3) 3 (4) 4

Q42.Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Finest gold is red in colour, as the size of the particles increases, it appears purple then blue and finally gold. Assertion R : The colour of the colloidal solution depends on the wavelength of light scattered by the dispersed particles. In the light of the above statements, choose the most appropriate answer from the options given below (1) Both A and R are true and R is the correct (2) Both A and R are true but R is NOT the correct explanation of A explanation of A (3) A is true but R is false (4) A is false but R is true

Q42.For micelle formation, which of the following statements are correct? (A) Micelle formation is an exothermic process. (B) Micelle formation is an endothermic process. (C) The entropy change is positive. (D) The entropy change is negative. JEE Main 2022 (25 Jul Shift 2) JEE Main Previous Year Paper (1) A & D only (2) A & C only (3) B & C only (4) B & D only