Practice Questions

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.Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : The diameter of colloidal particles in solution should not be much smaller than wavelength of light to show Tyndall effect. Reason R : The light scatters in all directions when the size of particles is large enough. In the light of the above statements, choose the correct answer from the options given below : JEE Main 2023 (13 Apr Shift 2) JEE Main Previous Year Paper (1) Both A and R are correct but R is NOT the (2) A is true but R is false correct explanation of A (3) A is false but R is true (4) Both A and R are correct and R is the correct explanation of A

Q41.Which of the following is used as a stabilizer during the concentration of sulphide ores? (1) Pine oils (2) Fatty acids (3) Xanthates (4) Cresols

Q41.An ammoniacal metal salt solution gives a brilliant red precipitate on addition of dimethylglyoxime. The metal ion is : (1) 𝐶𝑢2 + (2) 𝑁𝑖2 + (3) 𝐹𝑒2 + (4) Co2 +

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.

Q41.What is the purpose of adding gypsum to cement? (1) To facilitate the hydration of cement (2) To slow down the process of setting (3) To give a hard mass (4) To speed up the process of setting

Q41.During the borax bead test with CuSO4 , a blue green colour of the bead was observed in oxidising flame due to the formation of (1) Cu3 B2 (2) Cu (3) Cu (BO2)2 (4) CuO

Q41.A solution of FeCl3 when treated with K4Fe ( CN ) gives a prussian blue precipitate due to the formation of 6 (1) KFe2 ( CN ) (2) FeFe ( CN ) 6 6 (3) Fe3Fe ( CN ) (4) Fe4Fe ( CN ) 62 63

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.The density of alkali metals is in the order (1) K < Cs < Na < Rb (2) Na < Rb < K < Cs (3) Na < K < Cs < Rb (4) K < Na < Rb < Cs

Q41.Match List I with List II. Choose the correct answer from the options given below :- List I List II Isomeric pairs Type of isomers Propanamine and N- A I Metamers Methylethanamine Hexan-2-one Positional B II Hexan-3-one isomers Ethanamide and C III Functional isomers Hydroxyethanimine D o-nitrophenol and pnitrophenol IV Tautomers (1) A −III, B −IV, C −I, D −II (2) A −IV, B −III, C −I, D −II (3) A −II, B −III, C −I, D −IV (4) A −III, B −I, C −IV, D −II JEE Main 2023 (25 Jan Shift 2) JEE Main Previous Year Paper

Q41.During the qualitative analysis of SO32 - using dilute H2SO4, SO2 gas is evolved which turns K2Cr2O7 solution (acidified with dilute H2SO4): (1) Black (2) Red (3) Green (4) Blue

Q41.Some reactions of NO2 relevant to photochemical smog formation are Identify A, B, X and Y (1) X = [O], Y = NO, A = O2, B = O3 (2) X = N2O, Y = [O], A = O3, B = NO (3) X = 12 O2, Y = NO2, A = O3, B = O2 (4) X = NO, Y = [O], A = O2, B = N2O3 JEE Main 2023 (25 Jan Shift 1) JEE Main Previous Year Paper

Q41.When Cu2 + ion is treated with KI, a white precipitate, X appears in solution. The solution is titrated with sodium thiosulphate, the compound Y is formed. X and Y respectively are (1) X = Cu2I2, Y = Na2S4O5 (2) X = Cu2I2, Y = Na2S4O6 (3) X = CuI2, Y = Na2S4O3 (4) X = CuI2, Y = Na2S4O6

Q41.Which of the following can reduce decomposition of H2O2 on exposure to light (1) Urea (2) Alkali (3) Glass containers (4) Dust

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.In the extraction process of copper, the product obtained after carrying out the reactions (i) 2Cu2 S + 3O2 ⟶2Cu2O + 2SO2 (ii) 2Cu2O + Cu2 S ⟶6Cu + SO2 is called (1) Blister copper (2) Reduced copper (3) Copper scrap (4) Copper matte

Q41.The delicate balance of CO2 and O2 is NOT disturbed by (1) Respiration (2) Burning of coal (3) Deforestation (4) Burning of petroleum

Q41.The number of alkali metal(s), from Li, K, Cs, Rb having ionization enthalpy greater than 400 kJ mol−1 and forming stable super oxide is

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.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.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

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.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