Practice Questions

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

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

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.The value of log K for the reaction A ⇌B at 298 K is _______ . (Nearest integer) Given: 𝛥H° = - 54 . 07 kJ mol-1 𝛥S° = 10JK-1 mol-1 (Taken 2 . 303 × 8 . 314 × 298 = 5705 )

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

Q54.The observed magnetic moment of the complex [Mn(NCS)6)]x− is 6. 06 BM. The numerical value of x is

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.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

Q55.Choose the halogen which is most reactive towards SN1 reaction in the given compounds (A, B, C & D) A. B. C. D. (1) A −Br(b); B −I(a); C −Br(a); D −Br(a) (2) A −Br(b); B −I(b); C −Br(b); D −Br(b) (3) A −Br(a); B −I(a); C −Br(b); D −Br(a) (4) A −Br(a); B −I(a); C −Br(a); D −Br(a) JEE Main 2023 (08 Apr Shift 1) JEE Main Previous Year Paper

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

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.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 product from the following reaction. JEE Main 2023 (06 Apr 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 spin only magnetic moment of [Mn (H2O)6]2+ complexes is B. M. (Nearest integer) (Given atomic number of Mn = 25) JEE Main 2023 (01 Feb Shift 2) JEE Main Previous Year Paper

Q55.Consider the graph of Gibbs free energy G vs extent of reaction. The number of statement/s from the following which are true with respect to points (a), (b) and (c) is ______ A. Reaction is spontaneous at (a) and (b) B. Reaction is at equilibrium at point (b) and non-spontaneous at point (c) C. Reaction is spontaneous at (a) and non-spontaneous at (c) D. Reaction is non-spontaneous at (a) and (b)

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

Q56.Number of bromo derivatives obtained on treating ethane with excess of Br2 in diffused sunlight is _________

Q56.The major product formed in the following reaction is (1) (2) (3) (4) Q57.. Match List I with List II : List II (Compound with Functional group List I (Reagents used) detected) A.Alkaline solution of copper I. sulphate and sodium citrate B. Neutral FeCl3 solution II. C. Alkaline chloroform solution III. D.Potassium iodide and sodium IV hypochloride Choose the correct answer from the options given below : JEE Main 2023 (08 Apr Shift 1) JEE Main Previous Year Paper (1) A-III, B-IV, C-I, D-II (2) A-III, B-IV, C-II, D-I (3) A-IV, B-I, C-II, D-III (4) A-II, B-IV, C-III, D–I