Practice Questions

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

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

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

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

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.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.

Q60.In the given reaction (Where Et is -C2H5) The number of chiral carbon/s in product A is

Q60. In alanylglycylleucylalanylvaline the number of peptide linkages is:

Q60.The number of oxygen present in a nucleotide formed from a base, that is present only in RNA is

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. If the initial pressure of a gas is 0. 03 atm, the mass of the gas adsorbed per gram of the adsorbent is____ ×10−2 g

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

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.The number of chlorine atoms in bithionol is 1

Q60.The difference between spin only magnetic moment values of [Co (H2O)6] Cl2 and [Cr (H2O)6] Cl3 is

Q60.Among the following the number of curves not in accordance with Freundlich adsorption isotherm is |x+3|−1 ∈[−6, 3] −{−2, 2} : T = {x ∈Z : x2 −7|x| + 9 ≤0}. Then the number of

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

Q60.A sample of 4. 5 mg of an unknown monohydric alcohol, R −OH was added to methylmagnesium iodide. A gas is evolved and is collected and its volume measured to be 3. 1 mL. The molecular weight of the unknown alcohol is g/ mol. p is _______.

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) ¯