Practice Questions

Q40.Given below are two statements: Statement (I) : Oxygen being the first member of group 16 exhibits only – 2 oxidation state. Statement (II) : Down the group 16 stability of +4 oxidation state decreases and +6 oxidation state increases. In the light of the above statements, choose the most appropriate answer from the options given below: (1) Statement I is correct but Statement II is (2) Both Statement I and Statement II are correct incorrect (3) Both Statement I and Statement II are incorrect (4) Statement I is incorrect but Statement II is correct

Q40.Identify the mixture that shows positive deviations from Raoult's Law (1) ( CH3 ) 2CO + C6H5NH2 (2) CHCl3 + C6H6 ) (3) CHCl3 + ( CH3 ) 2CO (4) ( CH3 2CO + CS2

Q40.The emf of cell Tl Tl+ Cu2+ Cu is 0.83 V at 298 K. It could be increased by : (0.001M) (0.01M) (1) decreasing concentration of both Tl+ and Cu2+ (2) increasing concentration of Cu2+ ions ions (3) increasing concentration of T1+ ions (4) increasing concentration of both Tl+ and Cu2+ ions

Q41.In Kjeldahl's method for estimation of nitrogen, CuSO4 acts as : (1) Reducing agent (2) Catalytic agent (3) Hydrolysis agent (4) Oxidising agent

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.Identify 𝐴 and 𝐵 in the following reaction sequence. (1) (2) (3) (4)

Q41.The reaction; 1 2 H2( g) + AgCl(s) →H+(aq) + Cl−(aq) + Ag(s) occurs in which of the following galvanic cell : (1) Ag AgCl(s) KCl(soln.) AgNO3 (aq.) Ag (2) Pt H2( g) HCl(soln.) AgCl(s) Ag (3) Pt H2( g) KCl(soln. ) AgCl(s) Ag (4) Pt H2( g) HCl(soln.) AgNO3(aq) Ag −−

Q41.The quantity of silver deposited when one coulomb charge is passed through AgNO3 solution : (1) 1 g of silver (2) 1 electrochemical equivalent of silver (3) 1 chemical equivalent of silver (4) 0.1 g atom of silver

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.Diamagnetic Lanthanoid ions are: (1) Nd3+ and Eu3+ (2) La3+ and Ce4+ (3) Nd3+ and Ce4+ (4) Lu3+ and Eu3+ JEE Main 2024 (30 Jan Shift 1) JEE Main Previous Year Paper

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. 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.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)

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.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.Given below are two statements : Statement I : PF5 and BrF5 both exhibit sp3 d hybridisation. Statement II : Both SF6 and [Co(NH3)6]3+ exhibit sp3 d2 hybridisation. 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) Statement I is false but Statement II is true (3) Both Statement I and Statement II are true (4) Both Statement I and Statement II are false

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.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.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.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. Given below are two statements: Statements I: IUPAC name of Compound A is 4-chloro-1,3-dinitrobenzene. Statements II: IUPAC name of Compound B is 4-ethyl-2-methylaniline. 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 correct but Statement II is (4) Statement I is incorrect but Statement II is incorrect. correct.

Q41.The metals that are employed in the battery industries are A. Fe, B. Mn, C. Ni, D. Cr, E. Cd Choose the correct answer from the options given below: (1) B, C and E only (2) A, B, C, D and E (3) A, B, C and D only (4) B, D and E only

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.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