Practice Questions

Q41.Given below are the critical temperatures of some of the gases: Gas Critical temperature K He 5 . 2 CH4 190 CO2 304 . 2 NH3 405 . 5 The gas showing least adsorption on a definite amount of charcoal is (1) He (2) CH4 (3) CO2 (4) NH3

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

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.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 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.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)

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.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.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.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.Match List-I with List-II. List-I List-II ACds + 2NiOH3s →CdOs + 2NiOH2s + H2Ol I Primary battery JEE Main 2022 (28 Jul Shift 1) JEE Main Previous Year Paper Discharging of secondary B ZnHg + HgOs →ZnOs + Hgl II battery C 2PbSO4s + 2H2OI →Pbs + PbO2s + 2H2SO4aqIII Fuel cell D2H2g + O2g →2H2Ol IVCharging of secondary battery Choose the correct answer from the options given below (1) A - I, B - II, C - III, C - IV (2) A - IV, B - I, C - IV, C - III (3) A - II, B - I, C - IV, C - III (4) A - II, B - I, C - III, C - IV

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.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.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.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

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.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.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)

Q43.Given below are two statements . Statement I : In CuSO4 ⋅5H2O, Cu −O bonds are present. Statement II : In CuSO4. 5H2O, ligands coordinating with Cu (II) ion are O-and S-based ligands. In the light of the above statements, choose the correct answer from the options given below JEE Main 2022 (29 Jun 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

Q43.Match List-I with List-II List-I List-II (Complex) (Hybridization) A Ni (CO)4 I sp3 B [Ni (CN)4]2− II sp3 d2 C [Co (CN)6]3− III d2 sp3 D [CoF6]3− IV dsp2 Choose the correct answer from the options given below (1) A −IV, B −I, C −III, D −II (2) A −I, B −IV, C −III, D −II (3) A −I, B −IV, C −II, D −III (4) A −IV, B −I, C −II, D −III

Q43. Fe3+ cation gives a prussian blue precipitate on addition of potassium ferrocyanide solution due to the formation of (1) [Fe (H2O)6]2[Fe (CN)6] (2) Fe2 [Fe (CN)6]2 (3) Fe3 [Fe (OH)2(CN)4]2 (4) Fe4 [Fe (CN)6]3