Practice Questions

Q44.When MnO2 and H2SO4 is added to a salt (A), the greenish yellow gas liberated as salt (A) is : (1) CaI2 (2) NaBr (3) KNO3 (4) NH4Cl

Q44.Phenol treated with chloroform in presence of sodium hydroxide, which further hydrolysed in presence of an acid results (1) Salicyclic acid (2) Benzene-1,2-diol (3) Benzene-1, 3-diol (4) 2-Hydroxybenzaldehyde

Q44.Identify the incorrect pair from the following : (1) Fluorspar- BF3 (2) Cryolite- Na3 AlF6 (3) Fluoroapatite- 3 Ca3 (PO4)2 ⋅CaF2 (4) Carnallite- KCl ⋅MgCl2 ⋅6H2O

Q44.The coordination environment of Ca2+ ion in its complex with EDTA4− is : (1) tetrahedral (2) trigonal prismatic (3) octahedral (4) square planar

Q44.The metal that shows highest and maximum number of oxidation state is : (1) Fe (2) Mn (3) Co (4) Ti

Q44.While preparing crystals of Mohr's salt, dil H2SO4 is added to a mixture of ferrous sulphate and ammonium sulphate, before dissolving this mixture in water, dil H2SO4 is added here to : (1) prevent the hydrolysis of ferrous sulphate (2) prevent the hydrolysis of ammonium sulphate (3) make the medium strongly acidic (4) increase the rate of formation of crystals

Q45. Consider the above chemical reaction. Product " A " is : (1) (2) (3) (4)

Q45.Match List I with List II LIST – II LIST – I (Electronic (Complex ion) Configuration A. 𝐶𝑟𝐻2𝑂6 3 + I. 𝑡2𝑔2 𝑒𝑔0 B. 𝐹𝑒𝐻2𝑂6 3 + II. 𝑡2𝑔3 𝑒𝑔0 C. 𝑁𝑖𝐻2𝑂6 2 + III. 𝑡2𝑔3 𝑒𝑔2 D. 𝑉𝐻2𝑂6 3 + IV. 𝑡2𝑔6 𝑒𝑔2 Choose the correct answer from the options given below : (1) A-III, B-II, C-IV, D-I (2) A-IV, B-I, C-II, D-III (3) A-IV, B-III, C-I, D-II (4) A-II, B-III, C-IV, D-I

Q45.Identify the reagents used for the following conversion (1) A = LiAlH4, B = NaOH(aq), C = NH2 −NH2 / KOH ethylene glycol (2) A = LiAlH4, B = NaOH(alc) , C = Zn / HCl (3) A = DIBAL −H, B = NaOH(aq) C = NH2 −NH2 / KOH ethylene glycol (4) A = DIBAL −H, B = NaOH(alc), C = Zn / HCl

Q45.Which of the following compounds show colour due to d - d transition? (1) CuSO4 · 5H2O (2) K2Cr2O7 (3) K2CrO4 (4) KMnO4

Q45.In chromyl chloride test for confirmation of Cl– ion, a yellow solution is obtained. Acidification of the solution and addition of amyl alcohol and 10% H2O2 turns organic layer blue indicating formation of chromium pentoxide. The oxidation state of chromium in that is (1) +6 (2) +5 (3) +10 (4) +3

Q45.he following complexes [CoCl(NH3)5]2+ , [Co(CN)6]3− , [Co(NH3)5 (H2O)]3+ , [Cu(H2O)4]2+ The correct (A) (B) (C) (D) order of A, B, C and D in terms of wavenumber of light absorbed is : (1) C < D < A < B (2) B < C < A < D (3) A < C < B < D (4) D < A < C < B

Q45.A first row transition metal in its +2 oxidation state has a spin-only magnetic moment value of 3.86BM. The atomic number of the metal is (1) 26 (2) 25 (3) 23 (4) 22

Q45.Identify correct statements from below: A. The chromate ion is square planar. JEE Main 2024 (31 Jan Shift 1) JEE Main Previous Year Paper B. Dichromates are generally prepared from chromates. C. The green manganate ion is diamagnetic. D. Dark green coloured K2MnO4 disproportionates in a neutral or acidic medium to give permanganate. E. With increasing oxidation number of transition metal, ionic character of the oxides decreases. Choose the correct answer from the options given below: (1) B, C, D only (2) A, D, E only (3) A, B, C only (4) B, D, E only

Q45.Which among the following halide/s will not show SN1 reaction: (1) H2C = CH - CH2Cl (2) CH3 - CH = CH - Cl (3) (4)

Q45.Which one of the following complexes will exhibit the least paramagnetic behaviour? [Atomic number, Cr = 24, Mn = 25, Fe = 26, Co = 27 ] (1) [Cr(H2O)6]2+ (2) [Fe(H2O)6]2+ (3) [Co(H2O)6]2+ (4) [Mn(H2O)6]2+

Q45.An octahedral complex with the formula CoCl3 ⋅nNH3 upon reaction with excess of AgNO3 solution gives 2 moles of AgCl. Consider the oxidation state of Co in the complex is ' x '. The value of " x + n " is ______ (1) 6 (2) 8 (3) 3 (4) 5

Q45.The F− ions make the enamel on teeth much harder by converting hydroxyapatite (the enamel on the surface of teeth) into much harder fluoroapatite having the formula. (1) [3 (Ca3(PO4)2) ⋅Ca(OH)2] (2) [3 (Ca3(PO4)3) ⋅CaF2] (3) [3 (Ca2(PO4)2) ⋅Ca(OH)2] (4) [3 (Ca3(PO4)2) ⋅CaF2]

Q45.The correct sequence of ligands in the order of decreasing field strength is : (1) NCS−> EDTA4−> CN−> CO (2) CO > H2O > F−> S2− (3) S2−> −OH > EDTA4−> CO (4) −OH > F−> NH3 > CN−

Q45. In the above reaction product ' P ' is JEE Main 2024 (09 Apr Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q45. This reduction reaction is known as: (1) Rosenmund reduction (2) Wolff-Kishner reduction (3) Stephen reduction (4) Etard reduction

Q45.The number of complexes from the following with no electrons in the t2 orbital is TiCl4, [MnO4]−, [FeO4]2−, [FeCl4]−, [CoCl4]2− JEE Main 2024 (05 Apr Shift 2) JEE Main Previous Year Paper (1) 1 (2) 4 (3) 3 (4) 2

Q45.Given below are two statements: Statement (I): A solution of NiH2O6 2 + is green in colour. Statement (II): A solution of Ni ( CN 2 - is colourless. ) 4 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 incorrect (2) Both Statement I and Statement II are correct (3) Statement I is incorrect but Statement II is (4) Statement I is correct but Statement II is correct incorrect

Q45.Given below are two statements : Statement (I) : The 4f and 5f - series of elements are placed separately in the Periodic table to preserve the principle of classification. Statement (II) : s-block elements can be found in pure form in nature. In light of the above statements, choose the most appropriate answer from the options given below: (1) Statement I is false but Statement II is true (2) Both Statement I and Statement II are true (3) Statement I is true but Statement II is false (4) Both Statement I and Statement II are false

Q45.The molecule/ion with square pyramidal shape is: (1) Ni ( CN ) 2 - (2) PCl5 4 (3) BrF5 (4) PF5 JEE Main 2024 (30 Jan Shift 2) JEE Main Previous Year Paper