Practice Questions

Q21.The coefficient of static friction between a wooden block of mass 0 . 5 kg and a vertical rough wall is 0 . 2 . The magnitude of the horizontal force that should be applied on the block to keep it adhere to the wall will be______N. 𝑔= 10 m s-2

Q31.The ionic radii of K+, Na+, Al3 + and Mg2 + are in the order : (1) Na+ < K+ < Mg2 + < Al3 + (2) Al3 + < Mg2 + < K+ < Na+ (3) Al3 + < Mg2 + < Na+ < K+ (4) K+ < Al3 + < Mg2 + < Na+

Q31.The unit of the van der Waals gas equation parameter ′a′ in (P + an2V2 )(V −nb) (1) dm3 mol−1 (2) kg ms−1 (3) atm dm6 mol−2 (4) kg ms−2

Q31.Which one of the following statements for D.I. Mendeleeff, is incorrect ? (1) He authored the textbook - Principles of (2) At the time, he proposed Periodic Table of Chemistry. elements structure of atom was known. (3) Element with atomic number 101 is named after (4) He invented accurate barometer. him. JEE Main 2021 (22 Jul Shift 1) JEE Main Previous Year Paper

Q31.Amongst the following, the linear species is: (1) NO2 (2) Cl2 O (3) O3 (4) N−3 JEE Main 2021 (17 Mar Shift 2) JEE Main Previous Year Paper

Q31. The class of drug to which chlordiazepoxide with above structure belongs is : (1) Analgesic (2) Tranquillizer (3) Antacid (4) Antibiotic

Q31.The absolute value of the electron gain enthalpy of halogens satisfies: (1) I > Br > Cl > F (2) Cl > Br > F > I (3) Cl > F > Br > I (4) F > Cl > Br > I

Q31.A certain orbital has no angular nodes and two radial nodes. The orbital is: (1) 2s (2) 3s (3) 3p (4) 2p JEE Main 2021 (18 Mar Shift 1) JEE Main Previous Year Paper

Q31.The orbital having two radial as well as two angular nodes is: (1) 5d (2) 4d (3) 4f (4) 3p

Q32.Match List − I with List − II : List −I List −II (a) NaOH (i) Acidic (b) Be(OH)2 (ii) Basic (c) Ca(OH)2 (iii) Amphoteric (d) B(OH)3 (e) Al(OH)3 Choose the most appropriate answer from the options given below (1) (a) −(ii), (b) −(ii), (c) −(iii), (d) −(ii), (e) (2)−(iii)(a) −(ii), (b) −(iii), (c) −(ii), (d) −(i), (e) −(iii) (3) (a) −(ii), (b) −(ii), (c) −(iii), (d) −(i), (e) −(iii)(a)(4) −(ii), (b) −(i), (c) −(ii), (d) −(iii), (e) −(iii)

Q32.The interaction energy of London forces between two particles is proportional to rx , where r is the distance between the particles. The value of x is : (1) 6 (2) −6 (3) 3 (4) −3

Q32.The compound/s which will show significant intermolecular H -bonding is/are : (1) (a), (b) and (c) (2) (b) only (3) (c) only (4) (a) and (b) only

Q32.The solubility of Ca (OH)2 in water is : [Given : The solubility product of Ca (OH)2 in water = 5. 5 × 10−6 ] (1) 1. 77 × 10−2 (2) 1. 77 × 10−6 (3) 1. 11 × 10−2 (4) 1. 11 × 10−6

Q32.A central atom in a molecule has two lone pairs of electrons and forms three single bonds. The shape of this molecule is (1) see-saw (2) planar triangular (3) T-shaped (4) trigonal pyramidal

Q32.The characteristics of elements X, Y and Z with atomic numbers, respectively, 33, 53 and 83 are: (1) X and Y are metalloids and Z is a metal (2) X is a metalloid, Y is a non-metal and Z is a metal. (3) X, Y and Z are metals. (4) X and Z are non-metals and Y is a metalloid

Q33.The oxidation states of nitrogen in NO, NO2, N2O and NO−3 are in the order of : (1) NO−3 > NO2 > NO > N2O (2) NO2 > NO−3 > NO > N2O (3) N2O > NO2 > NO > NO−3 (4) NO > NO2 > N2O > NO−3

Q33.The hybridisations of the atomic orbitals of nitrogen in NO−2 , NO+2 and NH+4 respectively are. (1) sp3, sp2 and sp (2) sp, sp2 and sp3 (3) sp3, sp and sp2 (4) sp2, sp and sp3

Q33.The correct shape and I −I −I bond angles respectively in I−3 ion are: (1) T-shaped; 180° and 90° (2) Distorted trigonal planar; 135° and 90° (3) Trigonal planar; 120° (4) Linear; 180°

Q33.The functional groups that are responsible for the ion-exchange property of cation and anion exchange resins, respectively, are : (1) −SO3 H and −NH2 (2) −SO3 H and −COOH (3) −NH2 and −COOH (4) −NH2 and −SO3 H

Q33.The number of neutrons and electrons, respectively, present in the radioactive isotope of hydrogen is :- (1) 1 and 1 (2) 3 and 1 (3) 2 and 1 (4) 2 and 2

Q33.Which one of the following methods is most suitable for preparing deionized water? (1) Synthetic resin method (2) Calgon's method (3) Clark's method (4) Permutit method

Q33.Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : In TlI3, isomorphous to CsI3 , the metal is present in +1 oxidation state. Reason R : Tl metal has fourteen f electrons in its electronic configuration. In the light of the above statements, choose the most appropriate answer from the options given below: JEE Main 2021 (26 Feb Shift 2) JEE Main Previous Year Paper (1) A is correct but R is not correct (2) Both A and R are correct and R is the correct explanation of A (3) A is not correct but R is correct (4) Both A and R are correct but R is NOT the correct explanation of A

Q33.A group 15 element, which is a metal and forms a hydride with strongest reducing power among group 15 hydrides. The element is : (1) Sb (2) P (3) As (4) Bi

Q33.Deuterium resembles hydrogen in properties but: JEE Main 2021 (27 Aug Shift 1) JEE Main Previous Year Paper (1) reacts vigorously than hydrogen (2) reacts just as hydrogen (3) emits β+ particles (4) reacts slower than hydrogen

Q33.Monomer of Novolac is : (1) 3-Hydroxybutanoic acid. (2) 1, 3 -Butadiene and styrene. (3) phenol and melamine. (4) o-Hydroxymethylphenol.