Practice Questions

Q31.The correct order of electron gain enthalpy is: (1) S > O > Se > Te (2) O > S > Se > Te (3) S > Se > Te > O (4) Te > Se > S > O

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

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

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.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.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.If the Thomson model of the atom was correct, then the result of Rutherford's gold foil experiment would have been: JEE Main 2021 (27 Jul Shift 2) JEE Main Previous Year Paper (1) All of the α -particles pass through the gold foil (2) α -particles are deflected over a wide range of without decrease in speed. angles. (3) All α -particles get bounced back by 180° . (4) α -particles pass through the gold foil deflected by small angles and with reduced speed.

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

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 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 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.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 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

Q32.Which one of the following is the correct PV vs P plot at constant temperature for an ideal gas ? ( P and V stand for pressure and volume of the gas respectively) (1) (2) (3) (4)

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

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.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 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 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 potassium ferrocyanide solution gives a Prussian blue colour, when added to : (1) CoCl3 (2) CoCl2 (3) FeCl2 (4) FeCl3

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.

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