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)

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

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

Q59.In the given reaction the number of sp2 hybridised carbon (s) in compound ′X′ is _______.

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

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

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.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.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.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 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.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.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.The difference in oxidation state of chromium in chromate and dichromate salts is___

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

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)

Q60.Reaction of [Co (H2O)6]2+ with excess ammonia and in the presence of oxygen results into a diamagnetic product. Number of electrons present in t2g -orbitals of the product is 1 (−1)n A

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

Q60.Optical activity of an enantiomeric mixture is +12. 6° and the specific rotation of (+) isomer is +30°. The optical purity is____ %