Practice Questions

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

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.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.Total number of compounds with Chiral carbon atoms from following is CH3 - CH2 - CHNO2 - COOH CH3 - CH ( I ) - CH2 - NO2 CH3 - CH2 - CHBr - CH2 - CH3 CH3 - CH2 - CH ( OH ) - CH2OH JEE Main 2024 (27 Jan Shift 2) JEE Main Previous Year Paper

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.The 'Spin only’ Magnetic moment for [Ni ( NH3 ) 6] 2 + is______ × 10 – 1 BM. (given = Atomic number of Ni : 28) Round off your answer to the nearest integer.

Q57.Among CrO, Cr2O3 and CrO3 , the sum of spin-only magnetic moment values of basic and amphoteric oxides is _______ 10−2BM (nearest integer). (Given atomic number of Cr is 24)

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.Consider the following redox reaction: MnO4- + H+ + H2C2O4 ⇌Mn2 + + H2O + CO2 The standard reduction potentials are given as below Ered° E0 = + 1 . 51 V; E0 = - 0 . 49 V CO2 / H2C2O4 MnO4- / Mn2 + If the equilibrium constant of the above reaction is given as Keq = 10x, then the value of x = _______ (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.A first row transition metal with highest enthalpy of atomisation, upon reaction with oxygen at high temperature forms oxides of formula M2On (where n = 3, 4, 5). The 'spin-only' magnetic moment value of the amphoteric oxide from the above oxides is ______ BM (near integer) (Given atomic number: Sc : 21, Ti : 22, V : 23, Cr : 24, Mn : 25, Fe : 26, Co : 27, Ni : 28, Cu : 29, 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.Consider the following first order gas phase reaction at constant temperature A(g) →2 B( g) + C(g) If the total pressure of the gases is found to be 200 torr after 23sec. and 300 torr upon the complete decomposition of A after a very long time, then the rate constant of the given reaction is ______ ×10−2 s−1 (nearest integer) [Given : log10(2) = 0.301]

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)

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 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.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 ______

Q58.When ' x ' ×10−2 mL methanol (molar mass = 32 g; density = 0.792 g/cm3 ) is added to 100 mL water (density = 1 g/cm3 ), the following diagram is obtained. x = ______ (nearest integer). [Given : Molal freezing point depression constant of water at 273.15 K is 1.86 K kg mol−1 ]

Q58.The mass of silver (Molar mass of Ag : 108 gmol−1 ) displaced by a quantity of electricity which displaces 5600 mL of O2 at S.T.P. will be _____ g.

Q58.Phthalimide is made to undergo following sequence of reactions. Total number of π bonds present in product 'P' is/are ______

Q58.Major product B of the following reaction has _______ π-bond.

Q58.The number of halobenzenes from the following that can be prepared by Sandmeyer's reaction is _______

Q58.In the reaction of potassium dichromate, potassium chloride and sulfuric acid (conc.), the oxidation state of the chromium in the product is + _______.

Q58.The difference in the 'spin-only' magnetic moment values of KMnO4 and the manganese product formed during titration of KMnO4 against oxalic acid in acidic medium is _______ BM. (nearest integer)

Q58.The hydrogen electrode is dipped in a solution of pH = 3 at 25°C. The potential of the electrode will be - 2 . 303RT ______ × 10-2 V. = 0 . 059 V Round off the answer to the nearest integer. F