Practice Questions

Q41.The number of s-electrons present in an ion with 55 protons in its unipositive state is (1) 8 (2) 9 (3) 12 (4) 10 JEE Main 2023 (24 Jan Shift 2) JEE Main Previous Year Paper

Q41.When 0. 01 mol of an organic compound containing 60% carbon was burnt completely, 4. 4 g of CO2 was produced. The molar mass of compound is _____ gmol−1 (Nearest integer)

Q41.The correct order of pKa values for the following compounds is: (1) c > a > d > b (2) b > d > a > c (3) b > a > d > c (4) a > b > c > d

Q41.The difference between electron gain enthalpies will be maximum between : (1) Ne and F (2) Ar and F (3) Ne and Cl (4) Ar and Cl

Q41.Structures of BeCl2 in solid state, vapour phase and at very high temperature respectively are: (1) Monomeric, Dimeric, Polymeric (2) Dimeric, Polymeric, Monomeric (3) Polymeric, Monomeric, Dimeric (4) Polymeric, Dimeric, Monomeric

Q41.Which of the following expressions is correct in case of a CsCl unit cell (edge length ‘ a ’) ? JEE Main 2023 (15 Apr Shift 1) JEE Main Previous Year Paper (1) rCs+ + rCl−= a2 (2) rCs+ + rCl−= √32 a (3) rCs+ + rCl−= a (4) rCs+ + rCl−= a √2

Q41.Compound from the following that will not produce precipitate on reaction with AgNO3 is JEE Main 2023 (11 Apr Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q41.Given below are two statements: Statement I: Sulphanilic acid gives esterification test for carboxyl group. Statement II: Sulphanilic acid gives red colour in Lassigne’s test for extra element detection. In the light of the above statements, choose the most appropriate answer from the options given below: JEE Main 2023 (01 Feb Shift 2) JEE Main Previous Year Paper (1) Statement I is correct but Statement II is (2) Both Statement I and Statement II are incorrect incorrect. (3) Both Statement I and Statement II are correct (4) Statement I is incorrect but Statement II is correct.

Q42.A cubic solid is made up of two elements X and Y. Atoms of X are present on every alternate corner and one at 1 rd the center of cube. Y is at 3 of the total faces. The empirical formula of the compound is (1) X2Y1.5 (2) X1.5Y (3) XY2.5 (4) X1.5Y2

Q42.The Lewis acid character of boron tri halides follows the order: (1) BCl3 > BF3 > BBr3 > Bl3 (2) Bl3 > BBr3 > BCl3 > BF3 (3) BBr3 > Bl3 > BCl3 > BF3 (4) BF3 > BCl3 > BBr3 > Bl3

Q42.Which of the following is correct order of ligand field strength? (1) CO < en < NH3 < C2O42 - < S2 - (2) S2 - < C2O42 - < NH3 < en < CO (3) NH3 < en < CO < S2 - < C2O42 - (4) S2 - < NH3 < en < CO < C2O42 -

Q42.Given below are two statements related to Ellingham diagram : Statement I : Ellingham diagrams can be constructed for formation of oxides, sulphides and halides of metals. Statement II : It consists of plots of ΔH° vs T for formation of oxides of elements. 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 correct (2) Both Statement I and Statement II are incorrect (3) Statement I is correct but Statement II is incorrect(4) Statement I is incorrect but Statement II is correct

Q42.Given below are two statements: Statement I : Aqueous solution of K2Cr2O7 is preferred as a primary standard in volumetric analysis over Na2Cr2O7 aqueous solution. Statement II : K2Cr2O7 has a higher solubility in water than Na2Cr2O7. In the light of the above statements, choose the correct 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.Which will undergo deprotonation most readily in basic medium? (1) a only (2) c only (3) Both a and c (4) b only

Q42.Given below are two statements: Statement I: Permutit process is more efficient compared to the synthetic resin method for the softening of water. Statement II: Synthetic resin method results in the formation of soluble sodium salts. In the light of the above statements, choose the most appropriate answer from the options given below: (1) Both the statements I and II are incorrect (2) Statement I is incorrect but statement II is correct (3) Both the statements I and II are correct (4) Statement I is correct but statement II is incorrect JEE Main 2023 (13 Apr Shift 1) JEE Main Previous Year Paper

Q42.Match List I with List II: List II List I (Mixture) (Separation Technique) (A) CHCl3 + C6H5 NH2 I Steam distillation JEE Main 2023 (30 Jan Shift 2) JEE Main Previous Year Paper Differential (B) C6H14 + C5H12 II extraction (C) C6H5 NH2 + H2O III Distillation Fractional (D) Organic compound in H2O IV distillation (1) A-IV, B-I, C-III, D-II (2) A-III, B-IV, C-I, D-II (3) A-II, B-I, C-III, D-IV (4) A-III, B-I, C-IV, D-II

Q42.Testosterone, which is a steroidal hormone, has the following structure. The total number of asymmetric carbon atom/s in testosterone is ____________. Q43. ‘ X ’ is: JEE Main 2023 (01 Feb Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q42.Given below are two statements: Statement I: Boron is extremely hard indicating its high lattice energy. Statement II: Boron has highest melting and boiling point compared to its other group members. 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) Statement I is correct but Statement II is incorrect (3) Both statement I and Statement II are correct (4) Statement I is incorrect but Statement II is correct

Q42.The number of possible isomeric products formed when 3 -chloro- 1 -butene reacts with HCl through carbocation formation is.........

Q42.Which of the Phosphorus oxoacid can create silver mirror from AgNO3 solution? (1) HPO3n (2) H4P2O5 (3) H4P2O6 (4) H4P2O7

Q42.From the figure of column chromatography given below, identify incorrect statements. JEE Main 2023 (06 Apr Shift 2) JEE Main Previous Year Paper A . Compound ‘ c’ is more polar than ‘ a ’ and ‘ b ’ B. Compound ‘ a ’ is least polar C. Compound ‘ b’ comes out of the column before ‘ c’ and after ‘ a ’ D . Compound ‘ a ’ spends more time in the column Choose the correct answer from the options given below (1) A, B and D only (2) A, B and C only (3) B and D only (4) B, C and D only

Q42.Compound that will give positive Lassaigne's test for both nitrogen and halogen is (1) N2H4 ⋅HCl (2) CH3 NH2. HCl (3) NH4 Cl (4) NH2 OH. HCl

Q42.Highest oxidation state of Mn is exhibited in Mn2O7. The correct statements about Mn2O7 are (A) Mn is tetrahedrally surrounded by oxygen atoms (B) Mn is octahedrally surrounded by oxygen atoms (C) Contains Mn - O - Mn bridge (D) Contains Mn - Mn bond. Choose the correct answer from the options given below (1) A and C only (2) A and D only (3) B and D only (4) B and C only

Q42.Given below are two statements : Statement-I : Methane and steam passed over a heated Ni catalyst produces hydrogen gas. JEE Main 2023 (11 Apr Shift 1) JEE Main Previous Year Paper Statement-II : Sodium nitrite reacts with NH4Cl to give H2O, N2 and NaCl. 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) Both the statements I and II are incorrect correct (3) Statement I is correct but Statement II is (4) Both the statements I and II are correct incorrect

Q42.Molar mass of the hydrocarbon (X) which on ozonolysis consumes one mole of O3 per mole of (X) and gives one mole each of ethanal and propanone is ______ g mol–1 (Molar mass of C : 12 g mol–1 , H : 1 g mol–1 )