Practice Questions

Q49. List - I List - II Reaction Type of redox reaction (A) Li (I) 589.2 Match List - I with List - II. Choose the correct answer from the options (B) Na (II) 455.5 (C) Rb (III) 670.8 (D) Cs (IV) 780.0 given below : (1) (A)-(II), (B)-(IV), (C)-(III), (D)-(I) (2) (A)-(I), (B)-(IV), (C)-(III), (D)-(II) (3) (A)-(IV), (B)-(II), (C)-(I), (D)-(III) (4) (A)-(III), (B)-(I), (C)-(IV), (D)-(II)

Q49.The Lassiagne's extract is boiled with dil HNO3 before testing for halogens because, (1) AgCN is soluble in HNO3 (2) Silver halides are soluble in HNO3 (3) Ag2 S is soluble in HNO3 (4) Na2 S and NaCN are decomposed by HNO3

Q49. Major product of the following reaction is JEE Main 2024 (09 Apr Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q49.Identify ' A ' in the following reaction: (1) (2) (3) (4)

Q50. Match List I with List II Choose the correct answer from the options given below :- (1) A-II, B-I, C-III, D-IV (2) A-IV, B-II, C-I, D-III (3) A-I, B-III, C-IV, D-II (4) A-II, B-III, C-I, D-IV

Q50. The incorrect statement regarding the given structure is (1) can be oxidized to a dicarboxylic acid with Br2 (2) will coexist in equilibrium with 2 other cyclic water structure (3) despite the presence of - CHO does not give (4) has 4 asymmetric carbon atom Schiff's test JEE Main 2024 (08 Apr Shift 1) JEE Main Previous Year Paper

Q50.Given below are two statements : Statement I: Aniline reacts with con. H2SO4 followed by heating at 453 - 473 K gives p-aminobenzene sulphonic acid, which gives blood red colour in the 'Lassaigne's test'. Statement II: In Friedel - Craft's alkylation and acylation reactions, aniline forms salt with the AlCl3 catalyst. Due to this, nitrogen of aniline acquires a positive charge and acts as deactivating group. In the light of the above statements, choose the correct answer from the options given below : (1) Statement I is false but statement II is true (2) Both statement I and statement II are false (3) Statement I is true but statement II is false (4) Both statement I and statement II are true

Q50. List - I List - II A. α - Glucose and α - Galactose I. Functional isomers Match List I with List II B. α - Glucose and β - Glucose II. Homologous Choose the C. α - Glucose and α - Fructose III. Anomers D. α - Glucose and α - Ribose IV. Epimers correct answer from the options given below: (1) A-IV, B-III, C-I, D-II (2) A-III, B-IV, C-I, D-II (3) A-IV, B-III, C-II, D-I (4) A-III, B-IV, C-II, D-I

Q50. What is the structure of C JEE Main 2024 (09 Apr Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q50.Which of the following is the correct structure of L-Glucose? (1) (2) (3) (4)

Q50.The incorrect statement about Glucose is : (1) Glucose is soluble in water because of having (2) Glucose remains in multiple isomeric form in its aldehyde functional group aqueous solution (3) Glucose is one of the monomer unit in sucrose (4) Glucose is an aldohexose

Q50.Match List I with List I List I (Substances) List II (Element Present) A. Ziegler catalyst I. Rhodium B. Blood Pigment II. Cobalt C. Wilkinson catalyst III. Iron D. Vitamin B12 IV. Titanium Choose the correct answer from the options given below: (1) A-II, B-IV, C-I, D-III (2) A-II, B-III, C-IV, D-I (3) A-III, B-II, C-IV, D-I (4) A-IV, B-III, C-I, D-II

Q50.Given below are two statements : Statement (I) : All the following compounds react with p-toluenesulfonyl chloride. C6H5NH2 (C6H5)2NH (C6H5)3 N Statement (II) : Their products in the above reaction are soluble is aqueous NaOH. In the light of the above statements, choose the correct answer from the options given below (1) Statement I is false but Statement II is true (2) Statement I is true but Statement II is false (3) Both Statement I and Statement II are true (4) Both Statement I and Statement II are false

Q50.DNA molecule contains 4 bases whose structure are shown below. One of the structures is not correct, identify the incorrect base structure. (1) (2) (3) (4)

Q50.Match List I with List II List-I List-II A. Glucose/NaHCO3 / ∆ I. Gluconic acid B. Glucose/HNO3 II. No reaction JEE Main 2024 (31 Jan Shift 1) JEE Main Previous Year Paper C. Glucose/HI / ∆ III. n-hexane D. Glucose/Bromine water IV. Saccharic acid Choose the correct answer from the options given below: (1) A-IV, B-I, C-III, D-II (2) A-II, B-IV, C-III, D-I (3) A-III, B-II, C-I, D-IV (4) A-I, B-IV, C-III, D-II

Q50.The products A and B formed in the following reaction scheme are respectively JEE Main 2024 (30 Jan Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q50.Match List - I with List - II. List-I (Reactants) List-II Products (A) Phenol, Zn / ∆ (I) Salicylaldehyde JEE Main 2024 (01 Feb Shift 2) JEE Main Previous Year Paper (B) Phenol, CHCl3, NaOH, HCl (II) Salicylic acid (C) Phenol, CO2, NaOH, HCl (III) Benzene (D) Phenol, Conc. HNO3 (IV) Picric acid Choose the correct answer from the options given below. (1) (A)-(IV), (B)-(II), (C)-(I), (D)-(III) (2) (A)-(IV), (B)-(I), (C)-(II), (D)-(III) (3) (A)-(III), (B)-(I), (C)-(II), (D)-(IV) (4) (A)-(III), (B)-(IV), (C)-(I), (D)-(II) Q51.10 mL of gaseous hydrocarbon on combustion gives 40 mL of CO2g and 50 mL of water vapour. Total number of carbon and hydrogen atoms in the hydrocarbon is _______.

Q51.Number of spectral lines obtained in He+ spectra, when an electron makes transition from fifth excited state to first excited state will be

Q51.Consider the following reaction: 3PbCl2 + 2NH43PO4 →Pb3PO42 + 6NH4Cl If 72 mmol PbCl2 is mixed with 50 mmol of NH43PO4, then amount of Pb3PO42 formed in mmol. (nearest integer)

Q51.Number of compounds with one lone pair of electrons on central atom amongst following is _ O3, H2O, SF4, ClF3, NH3, BrF5, XeF4

Q51.The total number of molccules with zero dipole moment among CH4, BF3, H2O, HF, NH3, CO2 and SO2 is ______.

Q51.Molarity (M) of an aqueous solution containing x g of anhyd. CuSO4 in 500 mL solution at 32∘C is 2 × 10−1M. Its molality will be ______ ×10−3 m . (nearest integer). [Given density of the solution = 1.25 g/mL]

Q51.The de-Broglie's wavelength of an electron in the 4th orbit is πa0 ⋅(a0 = Bohr's radius ) JEE Main 2024 (04 Apr Shift 1) JEE Main Previous Year Paper

Q51.Based on Heisenberg's uncertainty principle, the uncertainty in the velocity of the electron to be found within an atomic nucleus of diameter 10−15 m is ________. 109 ms−1 (nearest integer) [Given : mass of electron = 9.1 × 10−31 kg, Plank's constant (h) = 6.626 × 10−34Js] (Value of π = 3.14)

Q51.In an atom, total number of electrons having quantum numbers n = 4, | ml| = 1 and ms = −12 is ______