Practice Questions

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

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 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.Number of compounds which give reaction with Hinsberg's reagent is _________. JEE Main 2024 (01 Feb Shift 2) JEE Main Previous Year Paper

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.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 _______

Q60.The Spin only magnetic moment value of square planar complex PtNH32ClNH2CH3Cl is _______ B.M. (Nearest integer) ( Given atomic number for Pt = 78 )

Q60.From the given list, the number of compounds with +4 oxidation state of Sulphur SO3, H2 SO3, SOCl2, SF4, BaSO4, H2 S2O7

Q60.From the vitamins 𝐴, 𝐵1, 𝐵6, 𝐵12, 𝐶, 𝐷, 𝐸 and 𝐾, the number vitamins that can be stored in our body is ______.

Q60. M2+ + H2 S →A (Black precipitate) + by product Consider the following test for a group-IV cation. A + aqua regia →B + NOCl + S + H2O The B + KNO2 + CH3COOH →C + by product spin-only magnetic moment value of the metal complex C is ______ BM (Nearest integer)

Q60. The ratio of number of oxygen atoms to bromine atoms in the product Q is ______ ×10−1 .

Q60.The total number of correct statements, regarding the nucleic acids is _________. A. RNA is regarded as the reserve of genetic information. B. DNA molecule self-duplicates during cell division C. DNA synthesizes proteins in the cell. D. The message for the synthesis of particular proteins is present in DNA E. Identical DNA strands are transferred to daughter cells.

Q60.The total number of carbon atoms present in tyrosine, an amino acid, is _______

Q60. Xg of ethanamine was subjected to reaction with NaNO2/HCl followed by hydrolysis to liberate N2 and HCl. The HCl generated was completely neutralised by 0.2 moles of NaOH. X is ______ g. ∈C : Im and S3 = {z ∈C : Re(z) ≥0}. Then the

Q60.The number of white coloured salts among the following is ....... A SrSO4 B MgNH4PO4 C BaCrO4 D Mn ( OH ) E PbSO4 F PbCrO4 2 G AgBr H PbI2 I CaC2O4 J Fe ( OH ) 2CH3COO

Q60.Vanillin compound obtained from vanilla beans, has total sum of oxygen atoms and π electrons is ______

Q60.The compound formed by the reaction of ethanal with semicarbazide contains _______ number of nitrogen atoms. ¯

Q60.Oxidation state of Fe(Iron) in complex formed in Brown ring test.

Q60.From the compounds given below, number of compounds which give positive Fehling's test is Benzaldehyde, Acetaldehyde, Acetone, Acetophenone,Methanal, 4-nitrobenzaldehyde, cyclohexane carbaldehyde. + i = √−1 and α, β ∈R, then α + β is equal to

Q60. In a borax bead test under hot condition, a metal salt (one from the given) is heated at point B of the flame, JEE Main 2024 (05 Apr Shift 1) JEE Main Previous Year Paper resulted in green colour salt bead. The spin-only magnetic moment value of the salt is _______ BM (Nearest integer) [Given atomic number of Cu = 29, Ni = 28, Mn = 25, Fe = 26]

Q60.Number of amine compounds from the following giving solids which are soluble in NaOH upon reaction with Hinsberg's reagent is _______

Q60.The number of tripeptides formed by three different amino acids using each amino acid once is _______.

Q60. Xg of ethylamine is subjected to reaction with NaNO2/HCl followed by water; evolved dinitrogen gas which occupied 2.24 L volume at STP. X is ×10−1 g.

Q60.Total number of essential amino acid among the given list of amino acids is _______ Arginine, Phenylalanine, Aspartic acid, Cysteine, Histidine, Valine, Proline

Q60.Molar mass of the salt from NaBr, NaNO3, KI and CaF2 which does not evolve coloured vapours on heating with concentrated H2SO4 is ____ g mol – 1, (Molar mass in g mol – 1 : Na : 23, N : 14, K : 39, O : 16, Br : 80, I : 127, F : 19, Ca : 40 )