Practice Questions

Q54.Find out the major product from the following reaction. (1) (2) (3) (4) Q55.' A ' in the given reaction is JEE Main 2023 (25 Jan Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q54.A ( g ) ⇌2 B ( g ) + C ( g ) For the given reaction, if the initial pressure is 450 mmHg and the pressure at time t is720 mmHg at a constant temperatureT and constant volume V. The fraction of A ( g ) decomposed under these conditions is x × 10-1. The value of x is (nearest integer)

Q54.The complex cation which has two isomers is: (1) [Co (H2O)6]3+ (2) [Co (NH3)5 Cl]2+ (3) [Co (NH3)5 NO2]2+ (4) [Co (NH3)5 Cl]+

Q54.In the following reaction (1) (2) (3) (4)

Q54.The sum of bridging carbonyls in W(CO)6 and Mn2 (CO)10 is _____ .

Q54.Maximum number of isomeric monochloro derivatives which can be obtained from 2,2,5,5- tetramethylhexane by chlorination is _________

Q54.For reaction: SO2 ( g) + 12O2 the same reaction is × 1013 . ( Nearest integer) (Given R = 0 . 082 L atm K-1 mol-1 )

Q54. The number of hyperconjugation structures involved to stabilize carbocation formed in the above reaction is __________.

Q54.Match List I with List II LIST-I LIST-II Complex Colour JEE Main 2023 (11 Apr Shift 2) JEE Main Previous Year Paper A. Mg(NH4) PO4 I. brown B. K3[Co (NO2)6] II. white C. MnO (OH)2 III. yellow D. Fe4 [Fe (CN)6]3 IV. blue Choose the correct answer from the options given below: (1) A-III, B-IV, C-II, D-I (2) A-II, B-III, C-I, D-IV (3) A-II, B-IV, C-I, D-III (4) A-II, B-III, C-IV, D-I

Q54.Uracil is base present in RNA with the following structure. % of N in uracil is _______.

Q54.The vapour pressure of 30% (w/v), aqueous solution of glucose is ________ mm Hg at 25∘C . JEE Main 2023 (15 Apr Shift 1) JEE Main Previous Year Paper [Given: The density of 30% (w/v), aqueous solution of glucose is 1. 2 g cm–3 and vapour pressure of pure water is 24 mm Hg.] (Molar mass of glucose is 180 g mol–1 )

Q54.In the following reaction, ‘ B’ is (1) (2) (3) (4)

Q55.The number of incorrect statement/s about the black body from the following is______ (A) Emit or absorb energy in the form of electromagnetic radiation. (B) Frequency distribution of the emitted radiation depends on temperature. (C) At a given temperature, intensity vs frequency curve passes through a maximum value. JEE Main 2023 (10 Apr Shift 1) JEE Main Previous Year Paper (D) The maximum of the intensity vs frequency curve is at a higher frequency at higher temperature compared to that at lower temperature.

Q55.The total pressure of a mixture of non-reacting gases X ( 0 . 6 g ) and Y ( 0 . 45 g ) in a vessel is 740 mm of Hg. The partial pressure of the gas X is mm of Hg . (Nearest Integer) (Given : molar mass X = 20 and Y = 45 g mol-1 )

Q55.A solution containing 2 g of a non-volatile solute in 20 g of water boils at 373 . 52 K. The molecular mass of the solute is _____ gmol-1. (Nearest integer) Given, water boils at 373 K, Kb for water = 0 . 52K kg mol-1

Q55.Find out the major product for the following reaction JEE Main 2023 (29 Jan Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q55.Find out the major products from the following reactions. JEE Main 2023 (24 Jan Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q55.The correct order in aqueous medium of basic strength in case of methyl substituted amines is: JEE Main 2023 (25 Jan Shift 1) JEE Main Previous Year Paper (1) Me2 NH > MeNH2 > Me3 N > NH3 (2) Me2 NH > Me3 N > MeNH2 > NH3 (3) NH3 > Me3 N > MeNH2 > Me2 NH (4) Me3 N > Me2 NH > MeNH2 > NH3

Q55.The number of correct statements from the following is ___________ (A) Conductivity always decreases with decrease in concentration for both strong and weak electrolytes. (B) The number of ions per unit volume that carry current in a solution increases on dilution. (C) Molar conductivity increases with decrease in concentration. (D) The variation in molar conductivity is different for strong and weak electrolytes. (E) For weak electrolytes, the change in molar conductivity with dilution is due to decrease in degree of dissociation.

Q55. A in the above reaction is : JEE Main 2023 (12 Apr Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q55.In the reaction given below ′B′ is: JEE Main 2023 (13 Apr Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q55.If the formula of Borax is Na2 B4O𝑥( OH ) 𝑦· zH2O, then x + y + z = ______ Q56.0 . 400 g of an organic compound ( X ) gave 0 . 376 g of AgBr in Carius method for estimation of bromine. % of bromine in the compound ( 𝑋) is (Given: Molar mass AgBr = 188 g mol-1 Br = 80 g mol-1

Q55.The number of endothermic process/es from the following is _______. A. I2 ( g ) →2I ( g ) B. HCl ( g ) →H ( g ) + Cl ( g ) C. H2O ( l ) →H2O ( g ) D. C ( s ) + O2 ( g ) →CO2 ( g ) E. Dissolution of ammonium chloride in water

Q55.An atomic substance A of molar mass 12 g mol – 1 has a cubic crystal structure with edge length of 300 pm. The no. of atoms present in one unit cell of A is (Nearest integer) Given the density of A is 3 . 0 g m m-1 and NAA = 6 . 02 × 1023 mol-1 Q56.0 . 004 M K2SO4 solution is isotonic with 0 . 01 M glucose solution. Percentage dissociation of K2SO4 is _____ (Nearest integer) = m Volt and

Q55.Given below are two statements, one is labelled as assertion A and the other is labelled as Reason R. assertion A : [CoCl (NH3)5]2+ absorbs at lower wavelength of light with respect to [Co (NH3)5(H2O)]3+ Reason R: It is because the wavelenght of light absorbed depends on the oxidation state of the metal ion. In the light of the above statements,choose the correct answer from the options given below: (1) A is false but R is true (2) A is true but R is false (3) Both A and R are true and R is the correct (4) Both A and R are true and R is NOT the correct explaination of A explaination of A