Practice Questions

Q53.The enthalpy change for the conversion of 1 (g) to Cl- ( aq ) is ( - ) 2Cl2 kJmol-1 (Nearest integer) JEE Main 2023 (31 Jan Shift 1) JEE Main Previous Year Paper Given : 𝛥dis HCl20 ( g ) = 240kJmol-1. 𝛥egHClo ( g ) = - 350kJmol-1, - = - 380kJmol-1 𝛥hydHClo ( g ) ( g) ⇌SO3 ( g) KP = 2 × 1012 at 27°C and 1 atm pressure. The Kc for

Q53.If the CFSE of [Ti (H2O)6]3+ is −96. 0 kJ / mol, this complex will absorb maximum at wavelength nm. (nearest integer) Assume Planck' constant (h) = 6. 4 × 10−34 Js, Speed of light (c) = 3. 0 × 108 m/s and Avogadro's constant (NA) = 6 × 1023/ mol. JEE Main 2023 (31 Jan Shift 2) JEE Main Previous Year Paper

Q53.The dissociation constant of acetic is x × 10 – 5 . When 25 mL of 0 . 2 M CH3COONa solution is mixed with 25 mL of 0 . 02 M CH3COOH solution, the pH of the resultant solution is found to be equal to 5. The value of x is _______.

Q53.The number of species from the following which have square pyramidal structure is _______ PF5, BrF4- , IF5, BrF5, XeOF4, ICl4-

Q53.At 25°C, the enthalpy of the following processes are given: H2 ( g) + O2 ( g) →2OH(g)𝛥Ho = 78 kJ mol-1 H2 ( g) + 1 / 2O2 ( g) →H2O(g)𝛥H0 = - 242 kJ mol-1 H2 ( g) →2H(g)𝛥Ho = 436 kJ mol-1 1 / 2O2 ( g) →O(g)𝛥H0 = 249 kJ mol-1 What would be the value of X for the following reaction? (Nearest integer) JEE Main 2023 (01 Feb Shift 1) JEE Main Previous Year Paper H2Og →Hg + OHg ∆Ho = X kJmol-1

Q53.A mixture of one mole of H2O and 1 mole of CO is taken in a 10 litre container and heated to 725 K. At equilibrium 40% of water by mass reacts with carbon monoxide according to the equation: COg + H2Og ⇌ CO2g + H2g. The equilibrium constant KC × 102 for the reaction is ________ (Nearest integer)

Q53.The number of molecules from the following which contain only two lone pair of electrons is _____________ H2O, N2, CO, XeF4, NH3, NO, CO2, F2

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.A 300mL bottle of soft drink has 0 . 2MCO2 dissolved in it. Assuming CO2 behaves as an ideal gas, the volume of the dissolved CO2 at STP is _____ mL. (Nearest integer) Given: At STP, molar volume of an ideal gas is 22 . 7L mol-1

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

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

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

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

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

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.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.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 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.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.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.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