Practice Questions

Q58.Number of oxygen atoms present in chemical formula of fuming sulphuric acid is ______.

Q58.The ratio of 14C in a piece of wood is 1 part that of atmosphere. If half life of 14C is 5730 years, the age of 12C 8 wood sample is ..... years.

Q58.In the Claisen-Schmidt reaction to prepare 351 g of dibenzalacetone using 87 g of acetone, the amount of benzaldehyde required is ______ g. (Nearest integer)

Q58.Total number of unpaired electrons in the complex ions [Co(NH3)6]3+ and [NiCl4]2− is

Q58. The total number of hydrogen atoms in product 𝐴 and product 𝐵 is__________.

Q58.A constant current was passed through a solution of AuCl−4 ion between gold electrodes. After a period of 10. 0 minutes, the increase in mass of cathode was 1. 314 g. The total charge passed through the solution is ___ ×10−2 F. (Given atomic mass of Au = 197)

Q58.The following data were obtained during the first order thermal decomposition of a gas A at constant volume: Ag →2 Bg + Cg S. No Time/s Total pressure/(atm) 1 . 0 0 . 1 2 . 115 0 . 28 The rate constant of the reaction is _______ × 10-2s-1 (nearest integer)

Q58.Number of colourless lanthanoid ions among the following is ________ Eu3+, Lu3+, Nd3+, La3+, Sm3+

Q58.The mass of sodium acetate (CH3 COONa) required to prepare 250 mL of 0. 35M aqueous solution is _____ g. ( Molar mass of CH3 COONa is 82. 02 g mol−1 ) Round off to the nearest integer.

Q58.The mass of zinc produced by the electrolysis of zinc sulphate solution with a steady current of 0. 015 A for 15 minutes is _ ___ × 10−4 g. (Atomic mass of zinc = 65. 4 amu)

Q58.Consider the following reaction MnO2 + KOH + O2 →A + H2O. Product ' A ' in neutral or acidic medium disproportionate to give products ' B ' and ' C ' along with water. The sum of spin-only magnetic moment values of B and C is BM. (nearest integer) (Given atomic number of Mn is 25) JEE Main 2024 (04 Apr Shift 1) JEE Main Previous Year Paper

Q59.The number of the correct reaction(s) among the following is ______

Q59.Time required for completion of 99 . 9% of first order reaction is ________ times of half life (t1 / 2 ) of the reaction

Q59.Number of ambidentate ligands among the following is ______ NO−2 , SCN−, C2O2−4 , NH3, CN−, SO2−4 , H2O.

Q59.A transition metal ' M ' among Sc, Ti, V, Cr, Mn and Fe has the highest second ionisation enthalpy. The spin- only magnetic moment value of M+ ion is _______. BM (Near integer) (Given atomic number Sc : 21, Ti : 22, V : 23, Cr : 24, Mn : 25, Fe : 26)

Q59.Consider the following data for the given reaction 2 HI(g) →H2( g) + I2( g) HI(molL−1) 0. 005 0. 01 0. 02 Rate (molL−1 s−1) 7. 5 × 10−4 3. 0 × 10−3 1. 2 × 10−2 The order of the reaction is __________.

Q59.Total number of species from the following with central atom utilising sp2 hybrid orbitals for bonding is _____. NH3, SO2, SiO2, BeCl2, C2H2, C2H4, BCl3, HCHO, C6H6, BF3, C2H4Cl2

Q59.The rate of first order reaction is 0. 04 mol L−1 s−1 at 10 minutes and 0. 03 mol L−1 s−1 at 20 minutes after initiation. Half life of the reaction is ______ minutes. (Given log 2 = 0. 3010, log 3 = 0. 4771) Round off your answer to the nearest integer.

Q59.If 279 g of aniline is reacted with one equivalent of benzenediazonium chloride, the maximum amount of aniline yellow formed will be _______ g. (nearest integer) (consider complete conversion).

Q59.The half-life of radioisotopic bromine - 82 is 36 hours. The fraction which remains after one day is _________ ×10−2 . (Given antilog 0. 2006 = 1. 587) Round off to the nearest integer

Q59.Two moles of benzaldehyde and one mole of acetone under alkaline conditions using aqueous NaOH after heating gives x as the major product. The number of π bonds in the product x is _______

Q59.The product (C) in the following sequence of reactions has ______ π bonds.

Q59.For a reaction taking place in three steps at same temperature, overall rate constant K = K1K2 . If Ea1, Ea2 and K3 Ea3 are 40, 50 and 60 kJ / mol respectively, the overall Ea is _________ kJ / mol .

Q59.The major products from the following reaction sequence are product A and product B. The total sum of π electrons in product A and product B are _______ (nearest integer) Q60. 9.3 g of pure aniline upon diazotisation followed by coupling with phenol gives an orange dye. The mass of orange dye produced (assume 100\% yield/conversion) is _______ g. (nearest integer)

Q59.A compound 𝑥 with molar mass 108𝑔 mol−1 undergoes acetylation to give product with molar mass 192𝑔 mol−1. The number of amino groups in the compound 𝑥 is ________.