Practice Questions

Q41.Lassaigne's test is used for detection of: (1) Nitrogen and Sulphur only (2) Nitrogen, Sulphur and Phosphorous Only (3) Phosphorous and halogens only (4) Nitrogen, Sulphur, and halogens

Q41.Choose the correct statements about the hydrides of group 15 elements. A. The stability of the hydrides decreases in the order NH3 > PH3 > AsH3 > SbH3 > BiH3 B. The reducing ability of the hydrides increases in the order NH3 < PH3 < AsH3 < SbH3 < BiH3 C. Among the hydrides, NH3 is strong reducing agent while BiH3 is mild reducing agent. D. The basicity of the hydrides increases in the order NH3 < PH3 < AsH3 < SbH3 < BiH3 Choose the most appropriate from the option given below: (1) B and C only (2) C and D only (3) A and B only (4) A and D only

Q41.Which of the following statements are correct about Zn, Cd and Hg ? A. They exhibit high enthalpy of atomization as the d-subshell is full. B. Zn and Cd do not show variable oxidation state while Hg shows +I and + II. C. Compounds of Zn, Cd and Hg are paramagnetic in nature. D. Zn, Cd and Hg are called soft metals. Choose the most appropriate from the options given below: (1) B, D only (2) B, C only (3) A, D only (4) C, D only

Q41.Match List I with List II List - I (Cell) List - II (Use/Property/Reaction) Converts energy of combustion into electrical A. Leclanche cell I. energy Does not involve any ion in solution and is used Choose the correct B. Ni −Cd cell II. in hearing aids C. Fuel cell III. Rechargeable D. Mercury cell IV. Reaction at anode Zn →Zn2+ + 2e− answer from the options given below: (1) A-II, B-III, C-IV, D-I (2) A-I, B-II, C-III, D-IV (3) A-III, B-I, C-IV, D-II (4) A-IV, B-III, C-I, D-II

Q41.Highest enol content will be shown by : JEE Main 2024 (27 Jan Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q42.For a reaction A K1→ B K2→ C If the rate of formation of B is set to be zero then the concentration of B is given by : (1) (K1 + K2)[A] (2) (K1/K2)[A] (3) (K1 −K2)[A] (4) K1 K2[ A]

Q42.The reaction at cathode in the cells commonly used in clocks involves. (1) reduction of Mn from +7 to +2 (2) reduction of Mn from +4 to +3 (3) oxidation of Mn from +3 to +4 (4) oxidation of Mn from +2 to +7

Q42.The arenium ion which is not involved in the bromination of Aniline is (1) (2) (3) (4)

Q42.The correct IUPAC name of K2 MnO4 is: (1) Potassium tetraoxopermanganate (VI) (2) Potassium tetraoxidomanganate (VI) (3) Dipotassium tetraoxidomanganate (VII) (4) Potassium tetraoxidomanganese (VI)

Q42.A solution of two miscible liquids showing negative deviation from Raoult's law will have : (1) increased vapour pressure, increased boiling (2) increased vapour pressure, decreased boiling point point (3) decreased vapour pressure, decreased boiling (4) decreased vapour pressure, increased boiling point point

Q42.On reaction of Lead Sulphide with dilute nitric acid which of the following is not formed? JEE Main 2024 (09 Apr Shift 1) JEE Main Previous Year Paper (1) Nitric oxide (2) Nitrous oxide (3) Lead nitrate (4) Sulphur Q43. 0.05MCuSO4 when treated with 0.01MK2Cr2O7 gives green colour solution of Cu2Cr2O7 . The two solutions are separated as shown below : [SPM : Semi Permeable Membrane] Due to osmosis : (1) Molarity of CuSO4 solution is lowered. (2) Molarity of K2Cr2O7 solution is lowered. (3) Green colour formation observed on side Y. (4) Green colour formation observed on side X.

Q42.For a strong electrolyte, a plot of molar conductivity against (concentration) 1/2 is a straight line, with a negative slope, the correct unit for the slope is (1) Scm2 mol−3/2 L−1/2 (2) Scm2 mol−3/2 L1/2 (3) Scm2 mol−3/2 L (4) Scm2 mol−1 L1/2

Q42.In the given reactions identify A and B . (1) 𝐴 : 2–Pentyne B : trans – 2 – butene (2) A : n – Pentane B : trans – 2 – butene (3) A : 2 – Pentyne B : Cis – 2 – butene (4) A : n – Pentane B : Cis – 2 – butene

Q42. List - I List - II Reaction Type of redox reaction (A) TiCl4 (I) e2, t02 Match List - I with List - II. Choose the correct answer from the (B) [FeO4]2− (II) e4, t32 (C) [FeCl4]− (III) e0, t02 (D) [CoCl4]2− (IV) e2, t32 options given below : (1) (A)-(III), (B)-(IV), (C)-(II), (D)-(I) (2) (A)-(IV), (B)-(III), (C)-(I), (D)-(II) (3) (A)-(III), (B)-(I), (C)-(IV), (D)-(II) (4) (A)-(I), (B)-(III), (C)-(IV), (D)-(II)

Q42.Choose the correct statements from the following A. All group 16 elements form oxides of general formula 𝐸𝑂2 and 𝐸𝑂3 where 𝐸= 𝑆, 𝑆𝑒, 𝑇𝑒 and 𝑃𝑜. Both the types of oxides are acidic in nature. B. 𝑇𝑒𝑂2 is an oxidising agent while 𝑆𝑂2 is reducing in nature. C. The reducing property decreases from 𝐻2𝑆 to 𝐻2𝑇𝑒 down the group. D. The ozone molecule contains five lone pairs of electrons. Choose the correct answer from the options given below: (1) A and D only (2) B and C only (3) C and D only (4) A and B only JEE Main 2024 (31 Jan Shift 2) JEE Main Previous Year Paper

Q42.For the electro chemical cell If E0 = 0.46 V and E0 = 0.34 V. Which of the following is correct? (M2+/M) (x/X2−) (1) M + X →M2+ + X2− is a spontaneous reaction (2) Ecell = 0.80 V (3) Ecell = −0.80 V (4) M2+ + X2−→M + X is a spontaneous reaction

Q42.What will be the decreasing order of basic strength of the following conjugate bases? –– −OH, RO, CH3COO, C–I –––– (1) RO > −OH > CH3COO > C–I (2) C–l > RO > −OH > CH3COO –––– (3) −OH > RO > CH3COO > C–1 (4) C–I > −OH > RO > CH3COO

Q42.In the given compound, the number of 2∘ carbon atom /s is _______. (1) Four (2) Two (3) One (4) Three JEE Main 2024 (08 Apr Shift 1) JEE Main Previous Year Paper

Q42.Which of the following compound will most easily be attacked by an electrophile? (1) (2) (3) (4) JEE Main 2024 (01 Feb Shift 1) JEE Main Previous Year Paper

Q42.The orange colour of K2Cr2O7 and purple colour of KMnO4 is due to (1) Charge transfer transition in both. (2) d →d transition in KMnO4 and charge transfer transitions in K2Cr2O7. (3) d →d transition in K2Cr2O7 and charge transfer (4) d →d transition in both. transitions in KMnO4. Q43.𝐴 and 𝐵 formed in the following reactions are: CrO2Cl2 + 4NaOH →A + 2NaCl + 2H2O A + 2HCl + 2H2O2 →B + 3H2O (1) A = Na2CrO4, B = CrO5 (2) A = Na2Cr2O4, B = CrO4 (3) A = Na2Cr2O7, B = CrO3 (4) A = Na2Cr2O7, B = CrO5

Q42.Match List-I with List-II List I (Species) List II (Electronic distribution) A. Cr+2 i. 3d8 B. Mn+ ii. 3d34s1 C. Ni+2 iii. . 3d4 D. V+ iv. 3d54s1 Choose the correct answer from the options given below: (1) (A)-I, (B)-II, (C)-III, (D)-IV (2) (A)-III, (B) - IV, (C) - I, (D)-II (3) (A)-IV, (B)-III, (C)-I, (D)-II (4) (A)-II, (B)-I, (C)-IV, (D)-III

Q42.Identify the factor from the following that does not affect electrolytic conductance of a solution. (1) The nature of the electrolyte added. (2) The nature of the electrode used. (3) Concentration of the electrolyte. (4) The nature of solvent used.

Q43.Fuel cell, using hydrogen and oxygen as fuels, A. has been used in spaceship B. has as efficiency of 40% to produce electricity C. uses aluminum as catalysts D. is eco-friendry E. is actually a type of Galvanic cell only Choose the correct answer from the options given below: (1) A, B, D, E only (2) A, D, E only (3) A, B, D only (4) A, B, C only

Q43.Choose the correct statements from the following A. Mn2O7 is an oil at room temperature B. V2O4 reacts with acid to give VO22 + C. CrO is a basic oxide D. V2O5 does not react with acid Choose the correct answer from the options given below: (1) A, B and D only (2) A and C only (3) A, B and C only (4) B and C only

Q43.Identify the incorrect statements about group 15 elements : (A) Dinitrogen is a diatomic gas which acts like an inert gas at room temperature. (B) The common oxidation states of these elements are −3, +3 and +5 . (C) Nitrogen has unique ability to form pπ −pπ multiple bonds. (D) The stability of +5 oxidation states increases down the group. (E) Nitrogen shows a maximum covalency of 6. Choose the correct answer from the options given below : JEE Main 2024 (08 Apr Shift 2) JEE Main Previous Year Paper (1) (A), (C), (E) only (2) (B), (D), (E) only (3) (D) and (E) only (4) (A), (B), (D) only