Practice Questions

Q50.If one strand of a DNA has the sequence ATGCTTCA, sequence of the bases in complementary strand is: (1) CATTAGCT (2) TACGAAGT (3) GTACTTAC (4) ATGCGACT

Q50. The incorrect statements regarding enzymes are : (A) Enzymes are biocatalysts. (B) Enzymes are non-specific and can catalyse different kinds of reactions. (C) Most Enzymes are globular proteins. (D) Enzyme - oxidase catalyses the hydrolysis of maltose into glucose. Choose the correct answer from the option given below : (1) (B), (C) and (D) (2) (B) and (D) (3) (A), (B) and (C) (4) (B) and (C)

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

Q50.Coagulation of egg, on heating is because of : JEE Main 2024 (05 Apr Shift 2) JEE Main Previous Year Paper (1) The secondary structure of protein remains (2) Denaturation of protein occurs unchanged (3) Biological property of protein remains unchanged(4) Breaking of the peptide linkage in the primary structure of protein occurs

Q50.Which structure of protein remains intact after coagulation of egg white on boiling? (1) Primary (2) Tertiary (3) Secondary (4) Quaternary

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

Q50.Two nucleotides are joined together by a linkage known as : (1) Phosphodiester linkage (2) Glycosidic linkage (3) Disulphide linkage (4) Peptide linkage

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.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.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)

Q51.Mass of methane required to produce 22 g of CO after complete combustion is g. (Given Molar mass in g mol- 1, C = 12. 0, H = 1. 0, O = 16. 0)

Q51.Volume of 3M NaOH (formula weight 40 g mol-1 ) which can be prepared from 84 g of NaOH is ____ × 10-1dm3. Q52.9 . 3 g of aniline is subjected to reaction with excess of acetic anhydride to prepare acetanilide. The mass of acetanilide produced if the reaction is 100% completed is _____ × 10-1 g. (Given molar mass in g mol-1 N = 14, O = 16, C = 12, H = 1 ) Q53.1 mole of PbS is oxidised by X moles of O3 to get Y moles of O2 . X + Y =

Q51.Frequency of the de-Broglie wave of electron in Bohr's first orbit of hydrogen atom is _______ ×1013 Hz [Given : RH( Rydberg constant ) = 2.18 × 10−18 J, h (Plank's (nearest integer). constant ) = 6.6 × 10−34 J.s.]

Q51.The molarity of 1L orthophosphoric acid H3PO4 having 70% purity by weight (specific gravity 1 .54 g cm−3 ) is ______ M. (Molar mass of H3PO4 = 98 g mol-1) o

Q51.Consider the following reactions NiS + HNO3 + HCl →A + NO + S + H2O A + NH4OH + H3C −C = N −OH | →B + NH4Cl + H2O The number of protons that do not involve in H3C −C = N −OH hydrogen bonding in the product B is ______.

Q51.Number of moles of methane required to produce 22g CO2 ( g ) after combustion is x × 10 – 2 moles. The value of x is

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

Q51.The maximum number of orbitals which can be identified with n = 4 and ml = 0 is ______ JEE Main 2024 (04 Apr Shift 2) 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.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.Number of compounds with one lone pair of electrons on central atom amongst following is _ O3, H2O, SF4, ClF3, NH3, BrF5, XeF4

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. A hypothetical electromagnetic wave is show below. The frequency of the wave is x × 1019 Hz . x = ______ (nearest integer)