Practice Questions

Q53.An amine (X) is prepared by ammonolysis of benzyl chloride. On adding p-toluenesulphonyl chloride to it the solution remains clear. Molar mass of the amine (X) formed is ______ gmol−1 . (Given molar mass in gmol−1C : 12, H : 1, O : 16, N : 14)

Q53.The enthalpy of formation of ethane (C2H6) from ethylene by addition of hydrogen where the bond-energies of C −H, C −C, C = C, H −H are 414 kJ, 347 kJ, 615 kJ and 435 kJ respectively is kJ

Q53.When equal volume of 1MHCl and 1MH2SO4 are separately neutralised by excess volume of 1M NaOH solution. x and y kJ of heat is liberated respectively. The value of y/x is _______

Q53.The total number of anti bonding molecular orbitals, formed from 2s and 2p atomic orbitals in a diatomic molecule is _____________.

Q53.The pH of an aqueous solution containing 1M benzoic acid pKa = 4 . 20 and 1M sodium benzoate is 4 . 5 . The volume of benzoic acid solution in 300 mL of this buffer solution is __________mL.

Q53.For the reaction N2O4( g) ⇌2 NO2( g), Kp = 0. 492 atm at 300 K. Kc for the reaction at same temperature is ______ × 10−2 . (Given : R = 0. 082 L atm mol−1 K−1 )

Q53.The number of species from the following in which the central atom uses sp3 hybrid orbitals in its bonding is _________. NH3, SO2, SiO2, BeCl2, CO2, H2O, CH4, BF3

Q53.An ideal gas, Cv = 2 R, is expanded adiabatically against a constant pressure of 1 atm untill it doubles in volume. If the initial temperature and pressure is 298 K and 5 atm, respectively then the final temperature is – _______ K (nearest integer). [ Cv is the molar heat capacity at constant volume] JEE Main 2024 (06 Apr Shift 1) JEE Main Previous Year Paper ′′ −

Q53.Sum of bond order of CO and NO+ is

Q53.If 5 moles of an ideal gas expands from 10L to a volume of 100L at 300K under isothermal and reversible condition then work, w, is −x J. The value of x is - _______. (Given R = 8 .314 J K-1 mol-1)

Q53.Combustion of 1 mole of benzene is expressed at C6H6(l) + 152 O2( g) →6CO2( g) + 3H2O(l). The standard enthalpy of combustion of 2 mol of benzene is −′x′kJ. x = ______ Given: 1. standard Enthalpy of formation of 1 mol of C6H6(l), for the reaction 6C (graphite) +3H2( g) →C6H6(l) is 48.5 kJ mol−1 . 2. Standard Enthalpy of formation of 1 mol of CO2( g), for the reaction C (graphite) +O2( g) →CO2( g) is −393.5 kJ mol−1 . 3. Standard and Enthalpy of formation of 1 mol of H2O(l), for the reaction H2( g) + 12 O2( g) →H2O(l) is −286 kJ mol−1 .

Q53.The number of molecules/ion/s having trigonal bipyramidal shape is …….. . PF5, BrF5, PCl5, PtCl4 2 - , BF3, Fe(CO ) 5

Q53.The total number of molecular orbitals formed from 2s and 2p atomic orbitals of a diatomic molecule

Q53. Consider the figure provided. 1 mol of an ideal gas is kept in a cylinder, fitted with a piston, at the position A, at 18∘C . If the piston is moved to position B , keeping the temperature unchanged, then ' x ' L atm work is done in this reversible process. x = ______ L atm. (nearest integer) [Given : Absolute temperature = ∘C + 273.15, R = 0.08206 L atm mol−1 K−1 ]

Q53.Three moles of an ideal gas are compressed isothermally from 60 L to 20 L using constant pressure of 5 atm . Heat exchange Q for the compression is - ______ Lit. atm.

Q53.In the lewis dot structure for NO−2 , total number of valence electrons around nitrogen is _______ JEE Main 2024 (05 Apr Shift 1) JEE Main Previous Year Paper

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.For the reaction at 298 K, 2 A + B →C. ΔH = 400 kJ mol−1 and ΔS = 0.2 kJ mol−1 K−1 . The reaction will become spontaneous above K.

Q54.Consider the following reaction at 298 K. 3 2O2g ⇌O3g . Kp = 2 . 47 × 10-29 ∆rG0 for the reaction is _________ kJ. (Given R = 8 . 314 JK – 1 mol – 1) Round off your answer to the nearest integer.

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.Total number of species from the following which can undergo disproportionation reaction ___________. H2O2, ClO3- , P4, Cl2, Ag, Cu+1, F2, NO2, K+

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.Total number of isomeric compounds (including stereoisomers) formed by monochlorination of 2- methylbutane is ______.

Q54.Standard enthalpy of vapourisation for CCl4 is 30. 5 kJ mol−1 . Heat required for vapourisation of 284 g of CCl4 at constant temperature is __________ kJ. (Given molar mass in gmol−1; C = 12, Cl = 35. 5) Round off your answer to the nearest integer.

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