Practice Questions

Q58.For the reaction taking place in the cell: Pt(s)H2(g)H+(aq) || Ag+(aq)|Ag(s) ° E cell = +0. 5332 V. The value of ΔfG⊖ is kJmol−1 . (in nearest integer)

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

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

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 ]

Q59.It has been found that for a chemical reaction with rise in temperature by 9 K the rate constant gets doubled. Assuming a reaction to be occurring at 300 K, the value of activation energy is found to be kJmol−1 . [nearest integer] (Given ln 10 = 2. 3, R = 8. 3 J K−1 mol−1, log 2 = 0. 30)

Q59.An acidified manganate solution undergoes disproportionation reaction. The spin-only magnetic moment value of the product having manganese in higher oxidation state is____B.M. (Nearest integer)

Q59.The number of stereoisomers formed in a reaction of ± PhC = OCOHCNPh with HCN is

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 major product of the following reaction contains____bromine atom(s). Q60. 2. 5 g of protein containing only glycine (C2H5 NO2) is dissolved in water to make 500 mL of solution. The osmotic pressure of this solution at 300 K is found to be 5. 03 × 10−3 bar. The total number of glycine units present in the protein is (Given : R = 0. 083 L bar K−1 mol−1 )

Q59.The Novolac polymer has mass of 963 g. The number of monomer units present in it are

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 spin-only magnetic moment value of M3+ ion (in gaseous state) from the pairs Cr3+ / Cr2+, Mn3+ / Mn2, Fe3+ / Fe2+ and Co3+ / Co2+ that has negative standard electrode potential, is_____ B. M.

Q59. Consider the above reaction. The number of π electrons present in the product ' P ' is

Q59.A 100 mL solution of CH3CH2MgBr on treatment with methanol produces 2 . 24 mL of a gas at STP. The weight of gas produced is____mg (nearest integer)

Q59.For a given chemical reaction γ1A + γ2B →γ3C + γ4D. Concentration of C changes from 10 mmol dm-3 to 20 mmol dm-3 in 10 s . Rate of appearance of D is 1 . 5 times the rate of disappearance of B which is twice the rate of disappearance A. The rate of appearance of D has been experimentally determined to be 9 mmol dm-3s-1 . Therefore the rate of reaction is____mmol dm-3s-1 . (Nearest Integer)

Q59.For a reaction A →2B + C the half lives are 100 s and 50 s when the concentration of reactant A is 0. 5 and 1. 0 mol L = respectively. The order of the reaction is

Q60.In the cobalt-carbonyl complex : [Co2 (CO)8], number of Co −Co bonds is " X" and terminal CO ligands is " Y ". X + Y =___

Q60. Zymase NaOI−−C6H12O6 → A → B + CHI3 Δ The number of carbon atoms present in the product B is JEE Main 2022 (29 Jun Shift 1) JEE Main Previous Year Paper

Q60.How many of the following drugs is/are example(s) of broad spectrum antibiotic? Ofloxacin, Penicillin G, Terpineol, Salvarsan

Q60.Acidified potassium permanganate solution oxidises oxalic acid. The spin-only magnetic moment of the mangenese product formed from the above reaction is B.M.___(Nearest Integer) ¯

Q60.In a linear tetrapeptide (Constituted with different amino acids), (number of amino acids) - (number of peptide bonds) is ¯

Q60.In the given reaction, The number of π electrons present in the product ′P′ is ____________.