Practice Questions

Q35.Given (A) 2COg + O2g →2CO2g ΔH1o = - x kJ mol-1 (B) Cgraphite + O2g →CO2g ΔH2o = - y kJ mol-1 1 The ∆Ho for the reaction Cgraphite + 2O2g →COg is (1) 2x - y (2) x + 2y 2 2 x - 2y (3) (4) 2y - x 2

Q35.Match List-I with List-II: List-I Species List-II Geometry/Shape A. H3O+ I. Tetrahedral B. Acetylide anion II. Linear C. NH4+ III. Pyramidal D. ClO2- IV. Bent Choose the correct answer from the options given below: (1) A(III), B(IV), C(I), D(II) (2) A(III), B(I), C(II), D(IV) (3) A(III), B(II), C(I), D(IV) (4) A(III), B(IV), C(II), D(I)

Q36.At 600 K, the root mean square (rms) speed of gas X (molar mass = 40) is equal to the most probable speed of gas Y at 90 K. The molar mass of the gas Y is _____ g mol–1 . (Nearest integer)

Q36.Among the following compounds, the one which shows highest dipole moment is (1) (2) (3) (4)

Q36.Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). JEE Main 2023 (30 Jan Shift 1) JEE Main Previous Year Paper Assertion (A): In expensive scientific instruments, silica gel is kept in watch-glasses or in semipermeable membrane bags. Reason (R): Silica gel adsorbs moisture from air via adsorption, thus protects the instrument from water corrosion (rusting) and / or prevents malfunctioning. In the light of the above statements, choose the correct answer from the options given below: (1) (A) is false but (R) is true (2) (A) is true but (R) is false (3) Both (A) and (R) are true and (R) is the correct (4) Both (A) and (R) are true but (R) is not the explanation of (A) correct explanation of (A)

Q36.The strength of 50 volume solution of hydrogen peroxide is _____ g/L (Nearest integer). Given: Molar mass of H2O2 is 34 g mol−1 Molar volume of gas at STP = 22. 7 L.

Q36. Three bulbs are filled with CH4, CO2 and Ne as shown in the picture. The bulbs are connected through pipes of zero volume. When the stopcocks are opened and the temperature is kept constant throughout, the pressure of the system is found to be______ atm. (Nearest integer).

Q36.Consider the following data Heat of combustion of H2(g) = –241. 8 kJ mol–1 Heat of combustion of C(s) = –393. 5 kJ mol–1 Heat of combustion of C2H5 OH(l)= –1234. 7 kJ mol–1 The heat of formation of C2H5 OH(l) is (–) _____ kJ mol–1 (Nearest integer).

Q36.Match List-I with List-II: List-I List-II A. K I. Thermonuclear reactions B. KCI II. Fertilizer C. KOH III. Sodium potassium pump D. Li IV. Absorbent of CO2 (1) A(III), B(II), C(IV), D(I) (2) A(III), B(IV), C(II), D(I) (3) A(IV), B(I), C(III), D(II) (4) A(IV), B(III), C(I), D(II)

Q36.Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Physical properties of isotopes of hydrogen are different. Reason R : Mass difference between isotopes of hydrogen is very large. In the light of the above statements, choose the correct answer from the options given below: (1) Both A and R are true and R is the correct (2) A is false but R is true explanation of A (3) A is true but R is false (4) Both A and R are true but R is NOT the correct explanation of A

Q36.Enthalpies of formation of CCl4( g), H2O(g), CO2( g) and HCl are −105, −242, −394 and −92 kJ mol−1 respectively. The magnitude of enthalpy of the reaction given below is kJmol−1 . (nearest integer) CCl4( g) + 2H2O(g) →CO2( g) + 4 HCl(g)

Q36.Given below are two reactions, involved in the commercial production of dihydrogen H2. The two reactions are carried out at temperature “T1” and “T2”, respectively T1 Cs + H2Og ⟶COg + H2g T2 COg + H2Og CatalystCO2g + H2g The temperatures T1 and T2 are correctly related as (1) T1 = T2 (2) T1 < T2 (3) T1 = 100 K, T2 = 1270 K (4) T1 > T2

Q36.Water decomposes at 2300 K H2O(g) →H2(g) + 12 O2(g) The percent of water decomposing at 2300 K and 1 bar is _____ (Nearest integer). Equilibrium constant for the reaction is 2 × 10−3 at 2300 K

Q36.Better method for preparation of BeF2, among the following is (1) ∆ (2) 𝛥 BeO + C + F2 ⟶BeF2 NH42BeF4 ⟶BeF2 (3) ∆ (4) Δ Be + F2 ⟶BeF2 BeH2 + F2 ⟶BeF2

Q36.The volume of HCl, containing 73g L−1 , required to completely neutralise NaOH obtained by reacting 0. 69 g of metallic sodium with water, is _____ mL. (Nearest Integer) (Given : molar Masses of Na, Cl, O, H are 23, 35. 5, 16 and 1g mol−1 respectively)

Q36.Match List-I with List-II. List-I List-II Element detected Reagent used/Product formed A Nitrogen I Na2FeCN5NO B Sulphur II AgNO3 C Phosphorus III Fe4FeCN63 D Halogen IV NH42MoO4 Choose the correct answer from the options given below: (1) A →III; B →I; C →IV; D →II (2) A →II; B →IV; C →I; D → III (3) A →IV; B →II; C →I; D →III (4) A →II; B →I; C →IV; D →III

Q36.Match List I with List II List I List II Elements Colour imparted to the flame A K I Brick Red B Ca II Violet C Sr III Apple Green D Ba IV Crimson Red Choose the correct answer from the options given below: (1) A-II, B-I, C-III, D-IV (2) A-II, B-IV, C-I, D-III (3) A-II, B-I, C-IV, D-III (4) A-IV, B-III, C-II, D-I

Q36.Increasing order of stability of the resonance structure is: JEE Main 2023 (24 Jan Shift 1) JEE Main Previous Year Paper (1) C, D, B, A (2) C, A, B, D (3) D, C, A, B (4) D, C, B, A

Q37.When a 60 W electric heater is immersed in a gas for 100 s in a constant volume container with adiabatic walls, the temperature of the gas rises by 5°C. The heat capacity of the given gas is JK−1 (Nearest integer) JEE Main 2023 (08 Apr Shift 1) JEE Main Previous Year Paper

Q37.A certain quantity of real gas occupies a volume of 0. 15 dm3 at 100 atm and 500 K when its compressibility factor is 1. 07. Its volume at 300 atm and 300 K (When its compressibility factor is 1. 4) is ______ × 10−4 dm3 (Nearest integer)

Q37. O −O bond length in H2O2 is X than the O −O bond length in F2O2 . The O −H bond length in H2O2 is Y ¯¯ than that of the O −F bond in F2O2 . Choose the correct option for X and Y from the given below. ¯¯ (1) X - shorter, Y− shorter (2) X -shorter, Y -longer (3) X -longer, Y -longer (4) X-longer, Y - shorter

Q37.Which one of the following statements is correct for electrolysis of brine solution? (1) Cl2 is formed at cathode (2) O2 is formed at cathode (3) H2 is formed at anode (4) OH-is formed at cathode

Q37.What is the correct order of acidity of the protons marked 𝐴– 𝐷 in the given compounds? (1) HC > HD > HB > HA (2) HC > HD > HA > HB (3) HD > HC > HB > HA (4) HC > HA > HD > HB

Q37.Which of the following statement is correct for paper chromatography? (1) Water present in the pores of the paper forms the (2) Paper sheet forms the stationary phase. stationary phase. (3) Water present in the mobile phase gets absorbed (4) Paper and water present in its pores together by the paper which then forms the stationary form the stationary phase. phase.

Q37. Where Nu = Nucleophile Find out the correct statement from the options given below for the above two reactions. JEE Main 2023 (11 Apr Shift 1) JEE Main Previous Year Paper (1) Reaction (I) is of 2nd order and reaction (II) is of (2) Reactions (I) and (II) both are of 2nd order 1st order (3) Reactions (I) is of 1st order and reaction (II) is of (4) Reaction (I) and (II) both are of 1st order 2 nd order