Practice Questions

Q53.Following Kjeldahl's method, 1 g of organic compound released ammonia, that neutralised 10 mL of 2MH2SO4 . The percentage of nitrogen in the compound is _______ % .

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.Sum of bond order of CO and NO+ is

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

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. 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 ]

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

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

Q54.Only 2 mL of KMnO4 solution of unknown molarity is required to reach the end point of a titration of 20 mL of oxalic acid (2M) in acidic medium. The molarity of KMnO4 solution should be M.

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.Number of isomeric products formed by monochlorination of 2-methylbutane in presence of sunlight is _______.

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

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

Q54.Total number of ions from the following with noble gas configuration is Sr2 + (Z = 38), Cs+ (Z = 55), La2 + (Z = 57)Pb2 + (Z = 82), Yb2 + (Z = 70) and Fe2 + (Z = 26)

Q55.The following concentrations were observed at 500 K for the formation of NH3 from N2 and H2 . At equilibrium : [N2] = 2 × 10−2M, [H2] = 3 × 10−2M and [NH3] = 1. 5 × 10−2M. Equilibrium constant for the reaction is ______.

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

Q55.Number of alkanes obtained on electrolysis of a mixture of CH3COONa and C2H5COONa 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.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.Consider the two different first order reactions given below A + B →C (Reaction 1 ) P →Q (Reaction 2) The ratio of the half life of Reaction 1 : Reaction 2 is 5 : 2. If t1 and t2 represent the time taken to complete 2/3rd and 45th of Reaction 1 and Reaction 2, respectively, then the value of the ratio t1 : t2 is ______ ×10−1 (nearest integer). [Given : log10(3) = 0.477 and log10(5) = 0.699]