Practice Questions

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.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. List - I List - II (Complex ion) (Spin only magnetic moment in B.M.) (A) [Cr(NH3)6]3+ (I) 4.90 Match List - I with List - II. Choose the (B) [NiCl4]2− (II) 3.87 (C) [CoF6]3− (III) 0.0 (D) [Ni(CN)4]2− (IV) 2.83 correct answer from the options given below : (1) (A)-(II), (B)-(III), (C)-(I), (D)-(IV) (2) (A)-(II), (B)-(IV), (C)-(I), (D)-(III) (3) (A)-(I), (B)-(IV), (C)-(II), (D)-(III) (4) (A)-(IV), (B)-(III), (C)-(I), (D)-(II)

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

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

Q46.The correct statements from the following are: A. The strength of anionic ligands can be explained by crystal field theory. B. Valence bond theory does not give a quantitative interpretation of kinetic stability of coordination compounds. C. The hybridization involved in formation of [Ni ( CN ) 4] 2 – complex is dsp2. D. The number of possible isomer(s) of cis-[PtCl2 ( en ) 2] 2 + is one Choose the correct answer from the options given below: (1) A, D only (2) A, C only (3) B, D only (4) B, C only

Q46.The coordination geometry around the manganese in decacarbonyldimanganese0 (1) Octahedral (2) Trigonal bipyramidal (3) Square pyramidal (4) Square planar

Q46.In alkaline medium. MnO−4 oxidises I− to (1) IO−4 (2) IO− (3) I2 (4) IO−3 JEE Main 2024 (29 Jan Shift 1) JEE Main Previous Year Paper

Q46.Given below are two statements : Statement (I) : SN2 reactions are 'stereospecific', indicating that they result in the formation of only one stereo-isomer as the product. Statement (II) : SN1 reactions generally result in formation of product as racemic mixtures. In the light of the above statements, choose the correct answer from the options given below : (1) Both Statement I and Statement II are false (2) Statement I is false but Statement II is true (3) Statement I is true but Statement II is false (4) Both Statement I and Statement II are true

Q46.If an iron (III) complex with the formula [Fe(NH3)x(CN)y]− has no electron in its eg orbital, then the value of x + y is JEE Main 2024 (04 Apr Shift 2) JEE Main Previous Year Paper (1) 4 (2) 5 (3) 6 (4) 3

Q46.Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R . Assertion A: Haloalkanes react with KCN to form alkyl cyanides as a main product while with AgCN form isocyanide as the main product. Reason R: KCN and AgCN both are highly ionic compounds. In the light of the above statement, choose the most appropriate answer from the options given below. (1) A is correct but R is not correct (2) Both A and R are correct but R is not the correct explanation of A (3) A is not correct but R is correct (4) Both A and R are correct and R is the correct explanation of A

Q46.The metal atom present in the complex MABXL (where A, B, X and L are unidentate ligands and M is metal) involves sp3 hybridization. The number of geometrical isomers exhibited by the complex is: (1) 2 (2) 0 (3) 4 (4) 3

Q46.Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : The total number of geometrical isomers shown by [Co(en)2Cl2]+ complex ion is three. Reason (R): [Co(en)2Cl2]+ complex ion has an octahedral geometry. In the light of the above statements, choose the most appropriate answer from the options given below : (1) Both (A) and (R) are correct but (R) is not the (2) (A) is not correct but (R) is correct correct explanation of (A) (3) Both (A) and (R) are correct and (R) is the (4) (A) is correct but (R) is not correct correct explanation of (A)

Q46.Which among the following compounds will undergo fastest SN2 reaction. (1) (2) (3) (4)

Q46.Given below are two statements : Statement I : Piciric acid is 2,4,6 - trinitrotoluene. Statement II : Phenol - 2,4 - disulphonic acid is treated with Conc. HNO3 to get picric acid. In the light of the above statements, choose the most appropriate answer from the options given below : (1) Statement I is incorrect but Statement II is (2) Both Statement I and Statement II are incorrect correct (3) Statement I is correct but Statement II is (4) Both Statement I and Statement II are correct incorrect

Q46.Identify the correct set of reagents or reaction conditions ' X ' and ' Y ' in the following set of transformation (1) X = dil.aq. NaOH, 20∘C, Y = Br2/CHCl3 (2) X = conc.alc. NaOH, 80∘C, Y = Br2/CHCl3 (3) X = dil.aq. NaOH, 20∘C, Y = HBr /acetic (4) X = conc.alc. NaOH, 80∘C, Y = HBr/ acetic acid acid

Q46.The correct order of reactivity in electrophilic substitution reaction of the following compounds is: (1) B > C > A > D (2) D > C > B > A (3) A > B > C > D (4) B > A > C > D

Q46.Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R . Assertion A : In aqueous solutions Cr2 + is reducing while Mn3 + is oxidising in nature. Reason R: Extra stability to half filled electronic configuration is observed than incompletely filled electronic configuration. In the light of the above statement, 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 false but R is true (4) A is true but R is false