Practice Questions

Q43.The product obtained from the electrolytic oxidation of acidified sulphate solutions, is : (1) HSO−4 (2) HO3 SOOSO3 H (3) HO2 SOSO2 H (4) HO3 SOSO3 H

Q43.Given below are two statements: Statement I : α and β forms of sulphur can change reversibly between themselves with slow heating or slow cooling. Statement II : At room temperature the stable crystalline form of sulphur is monoclinic sulphur. 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) Statement I is true but Statement II is false. (3) Statement I is false but Statement II is true. (4) Both Statement I and Statement II are false.

Q43. The product formed in the first step of the reaction of with excess Mg / Et2OEt = C2H5 is (1) (2) (3) (4)

Q44.The Crystal Field Stabilization Energy (CFSE) and magnetic moment (spin-only) of an octahedral aqua complex of a metal ion M𝑍+ are -0 . 8Δ0 and 3 . 87 BM, respectively. Identify M𝑍+ : (1) V3 + (2) Co2 + (3) Cr3 + (4) Mn4 +

Q44.The calculated magnetic moments (spin only value) for species [FeCl4]2−, [Co (C2O4)3]3− and MnO2−4 respectively are: (1) 4. 90, 0 and 1. 73 BM (2) 4. 90, 0 and 2. 83 BM (3) 5. 82, 0 and 0 BM (4) 5. 92, 4. 90 and 0 BM

Q44.What is the spin-only magnetic moment value (B.M.) of a divalent metal ion with atomic number 25, in its aqueous solution? JEE Main 2021 (17 Mar Shift 1) JEE Main Previous Year Paper (1) 5. 92 (2) 5. 0 (3) zero (4) 5. 26

Q44.Given below are two statement : one is labelled as Assertion A and the other is labelled as Reason R : Assertion A : Size of Bk3+ ion is less than Np3+ ion. Reason R : The above is a consequence of the lanthanide contraction. In the light of the above statements, choose the correct answer from the options given below : (1) A is false but R is true (2) Both A and R are true but R is not the correct explanation of A (3) A is true but R is false (4) Both A and R are true and R is the correct explanation of A

Q44.Which one of the following when dissolved in water gives coloured solution in nitrogen atmosphere? (1) Cu2 Cl2 (2) ZnCl2 (3) CuCl2 (4) AgCl

Q44.The major components of German Silver are : (1) Zn, Ni and Ag (2) Cu, Zn and Ni (3) Ge, Cu and Ag (4) Cu, Zn and Ag

Q44.Given below are two statements : Statement I : Ethyl pent- 4-yn-oate on reaction with CH3 MgBr gives a 3°-alcohol. JEE Main 2021 (27 Aug Shift 2) JEE Main Previous Year Paper Statement II : In this reaction one mole of ethyl pent- 4 -yn-oate utilizes two moles of CH3 MgBr. 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 false (2) Statement I is true but Statement II is false (3) Statement I is false but Statement II is true (4) Both Statement I and Statement II are true

Q44. Consider the above reaction sequence, Product "A" and Product "B" formed respectively are: JEE Main 2021 (25 Jul Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q44.For the given reaction: What is A ? JEE Main 2021 (26 Feb Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4) CH3 CH2 CH2 NH2

Q44.Reaction of Grignard reagent, C2H5 MgBr with C8H8O followed by hydrolysis gives compound A , which reacts instantly with Lucas reagent to give compound B(C10H13 Cl). The Compound B is: (1) (2) (3) (4)

Q44.Which one of the following group- 15 hydride is the strongest reducing agent ? (1) AsH3 (2) BiH3 (3) PH3 (4) SbH3

Q44.The correct order of intensity of colors of the compounds is: (1) [Ni(CN)4]2−> [NiCl4]2−> [Ni (H2O)6]2+ (2) [Ni (H2O)6]2+ > [NiCl4]2−> [Ni(CN)4]2− (3) [NiCl4]2−> [Ni (H2O)6]2+ > [Ni(CN)4]2− (4) [NiCl4]2−> [Ni(CN)4]2−> [Ni (H2O)6]2+ C2H5 OH −

Q44.The secondary valency and the number of hydrogen bonded water molecule(s) in CuSO4 ⋅5H2O, respectively, are (1) 6 and 4 (2) 4 and 1 (3) 6 and 5 (4) 5 and 1

Q44.Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Synthesis of ethyl phenyl ether may be achieved by Williamson synthesis. Reason (R): Reaction of bromobenzene with sodium ethoxide yields ethyl phenyl ether. 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 correct but (R) is not correct 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)

Q44.Given below are two statements : Statement I: [Mn(CN)6]3−, [Fe(CN)6]3− and [Co (C2O4)3]3− are d2 sp3 hybridised. Statement II : [MnCl6]3− and [FeF6]3− are paramagnetic and have 4 and 5 unpaired electrons, respectively. In the light of the above statements, choose the correct answer from the options given below: (1) Statement I is correct but statement II is false (2) Both statement I and statement II are false (3) Statement I is incorrect but statement II is true (4) Both statement I and statement II are are true

Q44.The structure of product C, formed by the following sequence of reactions is : Benzene KCN −−CH3 COOH + SOCl2 ⟶A → ⟶B →⟶C AlCl3 −OH (1) (2) (3) (4)

Q44.Given below are two statements: Statement I : CeO2 can be used for oxidation of aldehydes and ketones. Statement II : Aqueous solution of EuSO4 is a strong reducing agent. 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) Statement I is true but Statement II is false (3) Both Statement I and Statement II are false (4) Statement I is false but Statement II is true

Q44. In the above reaction, the reagent " A " is : (1) NaBH4, H3O+ (2) LiAlH4 (3) Alkaline KMnO4, H+ (4) HCl, Zn −Hg

Q44. Consider the given reaction, the product 'X' is: (1) (2) (3) (4)

Q44.Spin only magnetic moment of an octahedral complex of Fe2+ in the presence of a strong field ligand in BM is: (1) 4. 89 (2) 2. 82 (3) 0 (4) 3. 46

Q44.Arrange the following Cobalt complexes in the order of increasing Crystal Field Stabilization Energy (CFSE) value. Complexes: [CoF6]3− , [Co (H2O)6]2+ , [Co (NH3)6]3+ and [Co(en)3]3+ A B C D Choose the correct option : (1) B < C < D < A (2) B < A < C < D (3) A < B < C < D (4) C < D < B < A

Q44.Spin only magnetic moment in BM of FeCO4C2O4 + is : (1) 5 . 92 (2) 1 (3) 0 (4) 1 . 73 JEE Main 2021 (31 Aug Shift 2) JEE Main Previous Year Paper