Practice Questions

Q54.Number of compounds among the following which contain sulphur as heteroatom is____. Furan,Thiophene, Pyridine, Pyrrole, Cysteine, Tyrosine JEE Main 2024 (29 Jan Shift 1) JEE Main Previous Year Paper

Q54.Total number of optically active compounds from the following is ______

Q54.If three moles of an ideal gas at 300 K expand isothermally from 30 dm3 to 45 dm3 against a constant opposing pressure of 80 kPa, then the amount of heat transferred is __________J.

Q54.The major product of the following reaction is P . CH3C = C −CH3 (i) Na/ ing NH3→ Number of oxygen (ii) dil. KMnO4 273 K atoms present in product ' P ' is _______ (nearest integer)

Q54. The number of optical isomers in following compound is: ________

Q54.The heat of solution of anhydrous CuSO4 and CuSO4 ⋅5H2O are −70 kJ mol−1 and +12 kJ mol−1 respectively. The heat of hydration of CuSO4 to CuSO4 ⋅5H2O is −x kJ . The value of x is ______ (nearest integer).

Q54.Using the given figure, the ratio of Rf values of sample A and sample C is x × 10−2 . Value of x is ______

Q54.Ka for CH3COOH is 1 . 8 × 10-5 and Kb for NH4OH is 1 . 8 × 10-5 . The pH of ammonium acetate solution will be

Q54.An ideal gas undergoes a cyclic transformation starting from the point A and coming back to the same point by tracing the path A →B →C →A as shown in the diagram. The total work done in the process is _____ J.

Q54. In the given TLC, the distance of spot A & B are 5 cm & 7 cm, from the bottom of TLC plate, respectively. Rf value of B is x × 10−1 times more than A . The value of x is ______.

Q54.The heat of combustion of solid benzoic acid at constant volume is −321.30 kJ at 27∘C . The heat of combustion at constant pressure is (−321.30 −xR)kJ , the value of x is _______.

Q55.Number of compounds from the following which cannot undergo Friedel-Crafts reactions is: ________. toluene, nitrobenzene, xylene, cumene, aniline, chlorobenzene, m-nitroaniline, m-dinitrobenzene JEE Main 2024 (09 Apr Shift 2) JEE Main Previous Year Paper

Q55.Number of alkanes obtained on electrolysis of a mixture of CH3COONa and C2H5COONa is_____.

Q55.Number of geometrical isomers possible for the given structure is/are _________.

Q55.A solution containing 10 g of an electrolyte AB2 in 100 g of water boils at 100.52∘C . The degree of ionization of the electrolyte (α) is _______ ×10−1 . (nearest integer) [Given : Molar mass of AB2 = 200 g mol−1, Kb (molal boiling point elevation const. of water) = 0.52 K kg mol−1 , boiling point of water = 100∘C; AB2 ionises as AB2 →A2+ + 2 B−]

Q55.An artificial cell is made by encapsulating 0.2M glucose solution within a semipermeable membrane. The osmotic pressure developed when the artificial cell is placed within a 0.05M solution of NaCl at 300 K is _______ ×10−1 bar. (nearest integer). [Given : R = 0.083 Lbarmol−1 K−1 ] Assume complete dissociation of NaCl

Q55.The pH at which Mg(OH)2[ Ksp = 1 × 10−11] begins to precipitate from a solution containing 0. 10M Mg2+ ions is ______. Q56. 2 MnO−4 + bI−+ cH2 O →xI2 + yMnO2 + zOH− If the above equation is balanced with integer coefficients, the value of z is ________.

Q55.Considering acetic acid dissociates in water, its dissociation constant is 6.25 × 10−5 . If 5 mL of acetic acid is dissolved in 1 litre water, the solution will freeze at −x × 10−2∘C, provided pure water freezes at 0∘C. x = (Kf)water = 1.86 K kg mol−1. density of acetic acid is 1.2 g mol−1. ______ . (Nearest integer) Given : molar mass of water = 18 g mol−1. Acetic acid dissociates as molar mass of acetic acid=60 gmol−1. density of water = 1 g cm−3 CH3COOH ⇌CH3COO⊖+ H⊕

Q55.The number of non-polar molecules from the following is HF, H2O, SO2, H2, CO2, CH4, NH3, HCl, CHCl3, BF3

Q55. Consider the given reaction. The total number of oxygen atoms present per molecule of the product (P) is _________.

Q55.Total number of aromatic compounds among the following compounds is ______.

Q55.Among the following, total number of meta directing functional groups is (Integer based) −OCH3, −NO2, −CN, −CH3 −NHCOCH3 , −COR, −OH, −COOH, −Cl

Q55.How many compounds among the following compounds show inductive, mesomeric as well as hyperconjugation effects?

Q55.The number of different chain isomers for C7H16 is Q56. 2.5 g of a non-volatile, non-electrolyte is dissolved in 100 g of water at 25∘C. The solution showed a boiling point elevation by 2∘C. Assuming the solute concentration is negligible with respect to the solvent concentration, the vapor pressure of the resulting aqueous solution is mm of Hg (nearest integer) [Given : Molal boiling point elevation constant of water (Kb) = 0.52 K. kgmol−1 , 1 atm pressure = 760 mm of Hg, molar mass of water = 18 g mol−1 ]

Q55.Mass of ethylene glycol (antifreeze) to be added to 18 . 6 kg of water to protect the freezing point at -24°C is kg (Molar mass in gmol-1 for ethylene glycol 62, Kf of water = 1 . 86 K kg mol-1)