Practice Questions

Q58.The rate constants for decomposition of acetaldehyde have been measured over the temperature range 700 −1000 K . The data has been analysed by plotting lnk vs 103T graph. The value of activation energy for the reaction is kJmol−1 . (Nearest integer) (Given : R = 8. 31 JK−1 mol−1 )

Q58.Spin only magnetic moment of [MnBr6]4− is _____ B.M. (round off to the closest integer)

Q58.The amount of charge in F (Faraday) required to obtain one mole of iron from Fe3 O4 is ______. (Round off the answer to the nearest integer)

Q58.(a) Baryte, (b) Galena, (c) Zinc blende and (d) Copper pyrites. How many of these minerals are sulphide based?

Q58.The reaction between X and Y is first order with respect to X and zero order with respect to Y . [X] [Y] Initial rate Experiment molL−1 molL−1 molL−1min−1 JEE Main 2022 (29 Jul Shift 1) JEE Main Previous Year Paper I 0. 1 0. 1 2 × 10−3 II L 0. 2 4 × 10−3 III 0. 4 0. 4 M × 10−3 IV 0. 1 0. 2 2 × 10−3 Examine the data of table and calculate ratio of numerical values of M and L. Q59. [Fe (CN)6]3− should be an inner orbital complex. Ignoring the pairing energy, the value of crystal field stabilization energy for this complex is (−)_____ Δ0 .

Q58.(a) CoCl3. 4 NH3 , (b) CoCl3 ⋅5 NH3 , (c) CoCl3 ⋅6 NH3 and (d) CoCl (NO3)2 ⋅5 NH3 Number of complex(es) which will exist in cis-trans form is/are

Q58.The quantity of electricity in Faraday needed to reduce 1 mol of Cr2 O2−7 to Cr3+ is

Q58.A gaseous mixture of two substances A and B, under a total pressure of 0. 8 atm is in equilibrium with an ideal liquid solution. The mole fraction of substance A is 0. 5 in the vapour phase and 0. 2 in the liquid phase. The vapour pressure of pure liquid A is____atm.(Nearest integer)

Q58.Among Co3 + , Ti2 + , V2 + and Cr2 + ions, one if used as a reagent cannot liberate H2 from dilute mineral acid solution, its spin-only magnetic moment in gaseous state is _____ B.M. (Nearest integer) JEE Main 2022 (25 Jul Shift 1) JEE Main Previous Year Paper

Q58.Sum of oxidation state (magnitude) and coordination number of cobalt in NaCobpyCl4 is

Q58.For the decomposition of azomethane. CH3 N2 CH3(g) →CH3 CH3(g) + N2 a first order reaction, the variation in partial pressure with time at 600 K is given as The half life of the reaction is____ ×10−5 s

Q58.In a cell, the following reactions take place Fe2 + →Fe3 + + e- Eo + + = 0 . 77 V Fe3 / Fe2 2I- →I2 + 2e- EI20 / I- = 0 . 54 V The standard electrode potential for the spontaneous reaction in the cell is x × 10-2 V at 298 K. The value of x is - (Nearest Integer)

Q58.Amongst FeCl3 . 3H2O, K3FeCN6 and CoNH36Cl3, the spin-only magnetic moment value of the inner-orbital complex that absorbs light at shortest wavelength is B.M. [nearest integer]

Q58. Cu(s) + Sn2+(0. 001M) →Cu2+(0. 01M) + Sn(s) The Gibbs free energy change for the above reaction at 298 K is x × 10−1 kJ mol−1 . The value of x is____[nearest integer] [Given : E⊖ = 0. 34 V; E⊖ = −0. 14 V; F = 96500 Cmol−1 ] Cu2+ / Cu Sn2+ / Sn

Q58.In the titration of KMnO4 and oxalic acid in acidic medium, the change in oxidation number of carbon at the end point is

Q58.The spin-only magnetic moment value of the most basic oxide of vanadium among V2O3 ' V2O4 and V2O5 is____B.M. (Nearest integer)

Q59.Consider the following metal complexes : CoNH3 3 + CoClNH35 2 + 3 - Co ( CN ) 6 CoNH35H2O3 + The spin-only magnetic moment value of the complex that absorbs light with shortest wavelength is B.M. (Nearest integer)

Q59.The oxidation state of manganese in the product obtained in a reaction of potassium permanganate and hydrogen peroxide in basic medium is

Q59.For a first order reaction A →B, the rate constant, k = 5. 5 × 10−14 s−1 . The time required for 67% completion of reaction is x × 10−1 times the half life of reaction. The value of x is Nearest integer) (Given : log 3 = 0. 4771 )

Q59.For a reaction, given below is the graph of lnk vs 1T . The activation energy for the reaction is equal to____ cal mol−1 .(Given : R = 2 calK−1 mol−1 ) ​

Q59.The spin-only magnetic moment value of an octahedral complex among CoCl3 ⋅4 NH3 , NiCl2 ⋅6H2O and PtCl4 ⋅2 HCl, which upon reaction with excess of AgNO3 gives 2 moles of AgCl is_____B.M. (Nearest Integer)

Q59.The disproportionation of MnO42 - in acidic medium resulted in the formation of two manganese compounds A and B. If the oxidation state of Mn in B is smaller than that of A, then the spin-only magnetic moment μ value of B in BM is____ . (Nearest integer)

Q59.The number of statement(s) correct from the following for Copper is/are JEE Main 2022 (27 Jun Shift 1) JEE Main Previous Year Paper (A) Cu(II) complexes are always paramagnetic (B) Cu(I) complexes are generally colourless (C) Cu(I) is easily oxidized (D) In Fehling solution, the active reagent has Cu(I)

Q59.The conductivity of a solution of complex with formula CoCl3 (NH3)4 corresponds to 1 : 1 electrolyte, then the primary valency of central metal ion is

Q59.Catalyst A reduces the activation energy for a reaction by 10 kJ mol−1 at 300 K . The ratio of rate constants, kT, Catalysed is ex . The value of x is____[nearest integer] [Assume that the pre-exponential factor is same in Uncatalysed kT, both the cases. Given R = 8. 31 J K−1 mol−1 ]