Practice Questions

Q41.Given below are two statements: Statement I : Gallium is used in the manufacturing of thermometers. Statement II : A thermometer containing gallium is useful for measuring the freezing point (256 K) of brine solution. 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 false but Statement II is true (3) Both Statement I and Statement II are false (4) Statement I is true but Statement II is false

Q41.One of the commonly used electrode is calomel electrode. Under which of the following categories, calomel electrode comes? JEE Main 2024 (04 Apr Shift 1) JEE Main Previous Year Paper (1) Oxidation - Reduction electrodes (2) Metal ion - Metal electrodes (3) Gas - Ion electrodes (4) Metal - Insoluble Salt - Anion electrodes

Q41.Given below are two statements: Statement I : Nitration of benzene involves the following step - Statement II : Use of Lewis base promotes the electrophilic substitution of benzene. In the light of the above statements, choose the most appropriate answer from the options given below : JEE Main 2024 (05 Apr Shift 1) JEE Main Previous Year Paper (1) Statement I is correct but Statement II is incorrect(2) Statement I is incorrect but Statement II is correct (3) Both Statement I and Statement II are correct (4) Both Statement I and Statement II are incorrect

Q41.Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Both rhombic and monoclinic sulphur exist as S8 while oxygen exists as O2 . Reason (R) : Oxygen forms pπ −pπ multiple bonds with itself and other elements having small size and high electronegativity like C, N , which is not possible for sulphur. In the light of the above statements, choose the most appropriate answer from the options given below : (1) (A) is correct but (R) is not correct (2) (A) is not correct but (R) is correct (3) Both (A) and (R) are correct and (R) is the (4) Both (A) and (R) are correct but (R) is not the correct explanation of (A) correct explanation of (A)

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. In the above chemical reaction sequence " A " and " B " respectively are (1) H2O, H+ and KMnO4 (2) O3, Zn/H2O and NaOH(alc) /I2 (3) O3, Zn/H2O and KMnO4 (4) H2O, H+ and NaOH(alc)/I2

Q41.Choose the correct option having all the elements with d10 electronic configuration from the following: (1) 27Co, 28Ni, 26Fe, 24Cr (2) 29Cu, 30Zn, 48Cd, 47Ag (3) 46Pd, 28Ni, 26Fe, 24Cr (4) 28Ni, 24Cr, 26Fe, 29Cu

Q41.The major product(P) in the following reaction is (1) (2) (3) (4) JEE Main 2024 (29 Jan Shift 1) JEE Main Previous Year Paper

Q41.Identify 𝐴 and 𝐵 in the following reaction sequence. (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.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.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.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.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.

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.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.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.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.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.Give below are two statements: Statement I : The higher oxidation states are more stable down the group among transition elements unlike p-block elements. Statement II : Copper can not liberate hydrogen from weak acids. 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 false but Statement II is true (3) Both Statement I and Statement II are false (4) Statement I is true but Statement II is false

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

Q42.Given below are two statements: Statement (I) : In the Lanthanoids, the formation of Ce+4 is favoured by its noble gas configuration. Statement (II) : Ce+4 is a strong oxidant reverting to the common +3 state. In the 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

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.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. 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)