Practice Questions

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.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.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.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.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.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.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.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.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 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.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.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.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.Match List I with List II. List I With Ore List II Composition A.Siderite I. FeCO3 B.Malachite II. CuCO3 ⋅Cu(OH)2 C.Sphalerite III. ZnS D.Calamine IV. ZnCO3 Choose the correct answer from the options given below: (1) A-I, B-II, C-III, D-IV (2) A-III, B-IV, C-E, D-I (3) A-IV, B-III, C-I, D-II (4) A-I, B-II, C-IV, D-III

Q42.The most stable trihalide of nitrogen is. (1) NF3 (2) NCl3 (3) NBr3 (4) NI3

Q42.The compound(s) that is(are) removed as slag during the extraction of copper is : (1) CaO (2) FeO (3) Al2O3 (4) ZnO (5) NiO Choose the correct answer from the options given below (1) 3, 4 only (2) 2 only (3) 1, 2, 5 Only (4) 1, 2 only

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.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

Q43.The metal that is not extracted from its sulphide ore is (1) Aluminium (2) Iron (3) Lead (4) Zinc

Q43.In the given reaction 'A' can be (1) benzyl bromide (2) bromobenzene (3) cyclohexyl bromide (4) methyl bromide

Q43. Considering the above reactions, the compound ' A ' and compound ' B ' respectively are (1) (2) (3) (4) JEE Main 2022 (29 Jul Shift 1) JEE Main Previous Year Paper

Q43.Among the following, which is the strongest oxidizing agent? (1) Mn3 + (2) Ti3 + (3) Fe3 + (4) Cr3 +

Q43.Toluene can be easily converted into benzaldehyde by which of the following reagents? (1) CrO3 /acetic acid, H3O+ (2) CrO3 /acetic anhydride, H3O+ (3) KMnO4 / HCl, H3O+ (4) CO, HCl, Anhyd. AlCl3

Q43.Which oxoacid of phosphorous has the highest number of oxygen atoms present in its chemical formula? (1) Pyrophosphorous acid (2) Hypophosphoric acid (3) Phosphoric acid (4) Pyrophosphoric acid

Q43.Which of the following will have maximum stabilization due to crystal field? (1) [Ti (H2O)6]3+ (2) [Co (H2O)6]2+ (3) [Co (CN)6]3− (4) [Cu (NH3)4]2+