Practice Questions

Q56.NO2 required for a reaction is produced by decomposition of N2O5 in CCl4 as by equation 2N2O5 ( g ) →4NO2 ( g ) + O2 ( g ) The initial concentration of N2O5 is 3 mol L-1 and it is 2 . 75 mol L-1 after 30 minutes. The rate of formation of NO2 is x × 10-3 mol L-1 min-1, value of x is ________.

Q56.For a certain thermochemical reaction M →N at T = 400 K, ΔHo = 77 . 2 kJ mol-1, ΔSo = 122JK-1, log equilibrium constant ( logK ) is - _____ × 10-1.

Q56.Among VO+2 , MnO−4 and Cr2O2−7 , the spin-only magnetic moment value of the species with least oxidising ability is ______ BM (Nearest integer). (Given atomic member V = 23, Mn = 25, Cr = 24) JEE Main 2024 (06 Apr Shift 2) JEE Main Previous Year Paper

Q56.Time required for 99.9% completion of a first order reaction is _______ times the time required for completion of 90% reaction.(nearest integer)

Q56.Consider the following reaction, the rate expression of which is given below A + B →C rate = k[A]1/2[ B]1/2 The reaction is initiated by taking 1M concentration of A and B each. If the rate constant (k) is 4.6 × 10−2 s−1 , then the time taken for A to become 0.1M is ______ sec. (nearest integer)

Q56.One Faraday of electricity liberates x × 10 – 1 gram atom of copper from copper sulphate, x is______.

Q56.The standard reduction potentials at 298 K for the following half cells are given below : Cr2O2−7 + 14H+ + 6e−→2Cr3+ + 7H2O, E∘= 1.33 V Fe3+(aq) + 3e−→Fe E∘= −0.04 V Ni2+(aq) + 2e−→Ni E∘= −0.25 V Consider the given electrochemical reactions, The Ag+(aq) + e−→Ag E∘= 0.80 V Au3+(aq) + 3e−→Au E∘= 1.40 V number of metal(s) which will be oxidized be Cr2O2−7 , in aqueous solution is ______

Q56.The amount of electricity in Coulomb required for the oxidation of 1 mol of H2O to O2 is ______ × 105C .

Q56.A solution is prepared by adding 1 mole ethyl alcohol in 9 mole water. The mass percent of solute in the solution is ________ (Integer answer) (Given : Molar mass in gmol−1 Ethyl alcohol : 46 water: 18)

Q56.During Kinetic study of reaction 2A + B →C + D , the following results were obtained : A [M] B [M] initial rate of formation of D I 0.1 0.1 6.0 × 10−3 II 0.3 0.2 7.20 × 10−2 Based on above data, overall order of the reaction is III 0.3 0.4 2.88 × 10−1 IV 0.4 0.1 2.40 × 10−2 ______

Q56.Among the given organic compounds, the total number of aromatic compounds is JEE Main 2024 (27 Jan Shift 1) JEE Main Previous Year Paper Q57. 3−Methylhex-2-ene on reaction with HBr in presence of peroxide forms an addition product (A). The number of possible stereoisomers for ' A ' is ________.

Q56.r = kA for a reaction, 50% of A is decomposed in 120 minutes. The time taken for 90% decomposition of A is ______ minutes.

Q57.Number of carbocations from the following that are not stabilized by hyperconjugation is _______

Q57.Number of complexes which show optical isomerism among the following is _________. 3 - 3 + 2 + + ) cis - Cr ( ox ) 2Cl2 , Co ( en 3 , cis - Pt ( en ) 2Cl2 , cis - Co ( en ) 2Cl2 2 + 3 - ​, trans - Pt ( en , trans - Cr ( ox ) 2Cl2 ) 2Cl2 Q58.2 - chlorobutane + Cl2 →C4H8Cl2 (isomers) Total number of optically active isomers shown by C4H8Cl2, obtained in the above reaction is ________. JEE Main 2024 (30 Jan Shift 2) JEE Main Previous Year Paper

Q57.Molality of 0. 8M H2 SO4 solution (density 1. 06 g cm−3 ) is _______ ×10−3 m . Round off your answer to the nearest integer.

Q57.The fusion of chromite ore with sodium carbonate in the presence of air leads to the formation of products A and B along with the evolution of CO2 . The sum of spin-only magnetic moment values of A and B is ______ B.M. (Nearest integer) [Given atomic number : C : 6, Na : 11, O : 8, Fe : 26, Cr : 24]

Q57.Number of moles of H+ ions required by 1 mole of MnO4− to oxidise oxalate ion to CO2 is ______.

Q57.The spin-only magnetic moment value of the ion among Ti2+, V2+, Co3+ and Cr2+ , that acts as strong oxidising agent in aqueous solution is _______ BM (Near integer). (Given atomic numbers : Ti : 22, V : 23, Cr : 24, Co : 27)

Q57.Consider the following transformation involving first order elementary reaction in each step at constant Step 2 −temperature as shown below. A + B Step 1C → P Some details of the above reactions are listed below. Step 3 Step Rate constant (sec−1) Activation energy (kJ mol−1) 1 k1 300 If the overall rate constant of the above 2 k2 200 3 k3 Ea3 transformation (k) is given as k = k1k2 and the overall activation energy (Ea) is 400 kJ mol−1 , then the value k3 of Ea3 is kJmol−1 (nearest integer)

Q57.The 'spin only' magnetic moment value of MO42− is _______ BM. (Where M is a metal having least metallic radii. among Sc, Ti, V, Cr, Mn and Zn ). (Given atomic number: Sc = 21, Ti = 22, V = 23, Cr = 24, Mn = 25 and Zn = 30)

Q57.On a thin layer chromatographic plate, an organic compound moved by 3. 5 cm, while the solvent moved by 5 cm . The retardation factor of the organic compound is _____________ ×10−1

Q57.Molality of an aqueous solution of urea is 4.44 m. Mole fraction of urea in solution is x × 10−3 . Value of x is - (Integer answer)

Q57.Given below are two statements : Statement I: The rate law for the reaction A + B →C is rate (r) = k[A]2[B] . When the concentration of both A and B is doubled, the reaction rate is increased " x " times. Statement II : JEE Main 2024 (09 Apr Shift 1) JEE Main Previous Year Paper The figure is showing "the variation in concentration against time plot" for a " y " order reaction. The Value of x + y is ______

Q57.The potential for the given half cell at 298K is - ............ × 10-2V . 2H + + 2e- →H2 ( g) ( aq ) H+ = 1M, PH2 = 2 atm (Given2 . 303 RT / F = 0 . 06 V, log2 = 0 . 3)

Q57.The osmotic pressure of a dilute solution is 7 × 105 Pa at 273 K. Osmotic pressure of the same solution at 283 K is _______ × 104 Nm−2 .(Nearest integer)