Practice Questions

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

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

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.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.The most common oxidation state of Lanthanoid elements is +3. Which of the following is likely to deviate easily from +3 oxidation state? (1) Ce(At. No, 58) (2) La(At. No, 57) (3) Lu(At. No, 71) (4) Gd(At. No, 64)

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.Which of the following methods are not used to refine any metal? (A) Liquation (B) Calcination (C) Electrolysis (D) Leaching (E) Distillation Choose the correct answer from the options given below (1) B and D only (2) A, B, D and E only (3) B, D and E only (4) A, C and E only

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 most stable trihalide of nitrogen is. (1) NF3 (2) NCl3 (3) NBr3 (4) NI3

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.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.In liquation process used for tin Sn, the metal (1) is reacted with acid (2) is dissolved in water (3) is brought to molten form which is made to flow (4) is fused with NaOH, on a slope

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.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.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.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.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.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.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)