Practice Questions

Q56. The steam volatile compounds among the following are : (A) (B) (C) (D) Choose the correct answer from the options given below : (1) (B) and (D) Only (2) (A) and (C) Only (3) (A), (B) and (C) Only (4) (A) and (B) Only

Q56.Given below are two statements : Consider the following reaction (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

Q56.Identify correct statements : (A) Primary amines do not give diazonium salts when treated with NaNO2 in acidic condition. (B) Aliphatic and aromatic primary amines on heating with CHCl3 and ethanolic KOH form 2025 (28 Jan Shift 2) JEE Main Previous Year Paper carbylamines. (C) Secondary and tertiary amines also give carbylamine test. (D) Benzenesulfonyl chloride is known as Hinsberg's reagent. (E) Tertiary amines reacts with benzenesulfonyl chloride very easily. Choose the correct answer from the options given below : (1) (A) and (B) only (2) (D) and (E) only (3) (B) and (D) only (4) (B) and (C) only

Q56.Identify correct statement/s : (A) −OCH3 and −NHCOCH3 are activating group. (B) -CN and -OH are meta directing group. (C) -CN and −SO3H are meta directing group. (D) Activating groups act as ortho - and para directing groups. (E) Halides are activating groups. Choose the correct answer from the options given below : (1) (A) only (2) (A), (B) and (E) only (3) (A) and (C) only (4) (A), (C) and (D) only

Q56.Let us consider an endothermic reaction which is non-spontaneous at the freezing point of water. However, the reaction is spontaneous at boiling point of water. Choose the correct option. (1) Both ΔH and ΔS are (-ve) (2) ΔH is (-ve) but ΔS is (+ve) (3) ΔH is (+ve) but ΔS is (−ve) (4) Both ΔH and ΔS are (+ve)

Q57. E∘Cr2O2−7 /Cr3+ = 1.33 V E∘Cl2/Cl(−) = 1.36 V Based on the data given below : the strongest reducing agent is : E∘ = 1.51 V E∘ = −0.74 V MnO−4 /Mn2+ Cr3+/Cr (1) Cr (2) Cl− (3) MnO−4 (4) Mn2+

Q57.Given below are two statements : Statement ( I): The radii of isoelectronic species increases in the order. Mg2+ < Na+ < F−< O2− Statement (II): The magnitude of electron gain enthalpy of halogen decreases in the order. Cl > F > Br > I 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) Statement I is correct but Statement II is correct incorrect (3) Both Statement I and Statement II are incorrect (4) Both Statement I and Statement II are correct 2025 (29 Jan Shift 1) JEE Main Previous Year Paper

Q57. Which among the following react with Hinsberg's reagent? Choose the correct answer from the options given below: (1) A, B and E Only (2) A, C and E Only (3) C and D Only (4) B and D Only

Q57.Given below are two statements : Statement (I) : For a given shell, the total number of allowed orbitals is given by n2 . Statement (II) : For any subshell, the spatial orientation of the orbitals is given by −l to +l values including zero. 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 true but Statement II is false (3) Both Statement I and Statement II are true (4) Statement I is false but Statement II is true

Q57. The compounds which give positive Fehling's test are : (A) (B) (C) HOCH2 −CO −(CHOH)3 −CH2 −OH (D) (E) Choose the correct answer from the options given below : (1) (A), (D) and (E) Only (2) (C), (D) and (E) Only (3) (A), (C) and (D) Only (4) (A), (B) and (C) Only

Q57.The species which does not undergo disproportionation reaction is : (1) ClO−3 (2) ClO− (3) ClO−2 (4) ClO−4

Q58.Which of the following electrolyte can be used to obtain H2 S2O8 by the process of electrolysis? (1) Dilute solution of sodium sulphate. (2) Acidified dilute solution of sodium sulphate. (3) Dilute solution of sulphuric acid (4) Concentrated solution of sulphuric acid

Q58.Standard electrode potentials for a few half cells are mentioned below : E∘ = 0.34 V, E∘ = −0.76 V Cu2+/Cu Zn2+/Zn Which one of the following cells gives the most negative value of E∘Ag+/Ag = 0.80 V, E∘Mg2+/Mg = −2.37 V ΔG∘ ? (1) Zn Zn2+(1M) Ag+(1M) Ag (2) Zn Zn2+(1M) Mg2+(1M) Mg (3) Ag Ag+(1M) Mg2+(1M) Mg (4) Cu Cu2+(1M)∥Ag+(1M) Ag

Q58. List - I List - II (Carbohydrate) (Linkage Source) (A) Amylose (I) β −C1 −C4, plant Match List - I with List - II. Choose the (B) Cellulose (II) α −C1 −C4, animal (C) Glycogen (III) α −C1 −C4, α −C1 −C6, plant (D) Amylopectin (IV) α −C1 −C4, plant correct answer from the options given below : (1) (A)-(IV), (B)-(I), (C)-(III), (D)-(II) (2) (A)-(III), (B)-(II), (C)-(I), (D)-(IV) (3) (A)-(II), (B)-(III), (C)-(I), (D)-(IV) (4) (A)-(IV), (B)-(I), (C)-(II), (D)-(III)

Q58.The molar solubility(s) of zirconium phosphate with molecular formula (Zr4+)3(PO3−4 )4 is given by relation : (1) Ksp 13 (2) Ksp 17 ( 9612 ) ( 6912 ) (3) Ksp 17 (4) Ksp 16 ( 8435 ) ( 5348 )

Q58.For the reaction, H2( g) + I2( g) ⇌2HI( g) Attainment of equillibrium is predicted correctly by : 2025 (24 Jan Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4) −−

Q58.The amphoteric oxide among V2O3, V2O4 and V2O5 , upon reaction with alkali leads to formation of an oxide anion. The oxidation state of V in the oxide anion is : (1) +3 (2) +4 (3) +7 (4) +5

Q58.A weak acid HA has degree of dissociation x . Which option gives the correct expression of ( pH pKa )? (1) 0 (2) log(1 + 2x) (3) log ( 1−xx ) (4) log ( 1−xx )

Q58.The correct set of ions (aqueous solution) with same colour from the following is: 2025 (23 Jan Shift 1) JEE Main Previous Year Paper (1) Sc3+, Ti3+, Cr2+ (2) V2+, Cr3+, Mn3+ (3) Ti4+, V4+, Mn2+ (4) Zn2+, V3+, Fe3+

Q58.For a reaction, N2O5( g) →2NO2( g) + 12 O2( g) in a constant volume container, no products were present initially. The final pressure of the system when 50% of reaction gets completed is (1) 5 times of initial pressure (2) 5/2 times of initial pressure (3) 7/2 times of initial pressure (4) 7/4 times of initial pressure

Q59.The molecules having square pyramidal geometry are (1) BrF5&PCl5 (2) SbF5&PCl5 (3) SbF5&XeOF4 (4) BrF5&XeOF4

Q59.Given below are two statements: Statement I: In Lassaigne's test, the covalent organic molecules are transformed into ionic compounds. Statement II: The sodium fusion extract of an organic compound having N and S gives prussian blue colour with FeSO4 and Na4 [Fe(CN)6] In the light of the above statements, choose the correct answer from the options given below. (1) Statement I is true but Statement II is false (2) Both Statement I and Statement II are false (3) Both Statement I and Statement II are true (4) Statement I is false but Statement II is true

Q59.Arrange the following in increasing order of solubility product : Ca(OH)2, AgBr, PbS, HgS (1) HgS < AgBr < PbS < Ca(OH)2 (2) Ca(OH)2 < AgBr < HgS < PbS (3) PbS < HgS < Ca(OH)2 < AgBr (4) HgS < PbS < AgBr < Ca(OH)2

Q59.The molar conductivity of a weak electrolyte when plotted against the square root of its concentration, which of the following is expected to be observed ? (1) A small decrease in molar conductivity is (2) Molar conductivity decreases sharply with observed at infinite dilution. increase in concentration. (3) A small increase in molar conductivity is (4) Molar conductivity increases sharply with observed at infinite dilution. increase in concentration.

Q59.Which one of the following reaction sequences will give an azo dye? 2025 (29 Jan Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)