Practice Questions

Q34.The density of a monobasic strong acid (Molar mass 24. 2 g mol) is 1. 21 kg L . The volume of its solution required for the complete neutralization of 25 mL of 0. 24 M NaOH is 10−2 mL (Nearest integer) Q35.' 25 volume' hydrogen peroxide means (1) 1 L marketed solution contains 250 g of H2O2 . (2) 1 L marketed solution contains 75 g of H2O2 . (3) 100 mL marketed solution contains 25 g of (4) 1 L marketed solution contains 25 g of H2O2 . H2O2 .

Q34.Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Butan– 1–ol has higher boiling point than ethoxyethane. Reason R : Extensive hydrogen bonding leads to stronger association of molecules. In the light of the above statements, choose the correct answer from the options given below : (1) A is true but R is false (2) Both A and R are true and R is the correct explanation of A (3) Both A and R are true but R is not the correct (4) A is false but R is true explanation of A

Q34.The alkaline earth metal sulphate(s) which are readily soluble in water is/are: (A) BeSO4 (B) MgSO4 (C) CaSO4 (D) SrSO4 (E) BaSO4 Choose the correct answer from the options given below: (1) A only (2) B only (3) A and B (4) B and C

Q34.H2O2 acts as a reducing agent in (1) 2NaOCl + H2O2 →2NaCl + H2O + O2 (2) 2Fe2 + + 2H+ + H2O2 →2Fe3 + + 2H2O (3) Mn2 + + 2H2O2 →MnO2 + 2H2O (4) Na2 S + 4H2O2 →Na2SO4 + 4H2O

Q34.Which one of the following pairs is an example of polar molecular solids? (1) SO2( s), CO2( s) (2) SO2( s), NH3( s) (3) MgO(s), SO2(s) (4) HCl(s), AlN(s)

Q34.What happens when methane undergoes combustion in systems A and B respectively? (1) System A System B (2) System A System B Temperature rises Temperature remainsTemperaturesame remains same Temperature rises (3) System A System B (4) System A System B Temperature falls Temperature remainsTemperaturesame falls Temperature rises

Q34.Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The first ionization enthalpy of 3d series elements is more than that of group 2 metals Reason (R): In 3d series of elements successive filling of d-orbitals takes place. 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 true but (R) is false explanation of (A) (3) (A) is false but (R) is true (4) Both (A) and (R) are true but (R) is not the correct explanation of (A)

Q34.The number of statement's, which are correct with respect to the compression of carbon dioxide from point (a) in the Andrews isotherm from the following is _________. JEE Main 2023 (24 Jan Shift 2) JEE Main Previous Year Paper A. Carbon dioxide remains as a gas upto point (b) B. Liquid carbon dioxide appears at point (c) C. Liquid and gaseous carbon dioxide coexist between points (b) and (c) D. As the volume decreases from (b) to (c), the amount of liquid decreases

Q34.Which of the following relations are correct? (A) ΔU = q + pΔV (B) ΔG = ΔH −TΔS (C) ΔS = qrevT (D) ΔH = ΔU −ΔnRT Choose the most appropriate answer from the options given below : (1) C and D only (2) B and C only (3) A and B only (4) B and D only

Q34.Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Loss of electron from hydrogen atom results in nucleus of ~1 . 5 × 10 – 3 pm size. Reason R: Proton H+ always exists in combined form. In the light of the above statements, choose the most appropriate answer from the options given below: (1) Both A and R are correct and R is the correct (2) A is correct but R is not 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

Q35.Reaction of BeO with ammonia and hydrogen fluoride gives 'A' which on thermal decomposition gives BeF2 and NH4F. What is 'A' ? (1) H3NBeF3 (2) NH42BeF4 (3) NH4BeF3 (4) NH42Be2F6

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.Consider the following reaction approaching equilibrium at 27°C and 1 atm pressure Kt=03 A + B ⇌ C + D Kr=102 The standard Gibb's energy change (ΔrG°) at 27°C is (−) _____ kJmol−1 (Nearest integer). (Given : R = 8. 3J K−1 mol−1 and ln 10 = 2. 3 )

Q35.But-2-yne is reacted separately with one mole of Hydrogen as shown below: Na Pd / C ← B CH3 - C ≡ C - CH3 →∆ A¯ ¯ liq NH3 +H2 Identify the incorrect statements from the options given below: A. A is more soluble than B. B. The boiling point & melting point of A are higher and lower than B respectively. C. A is more polar than B because dipole moment of A is zero. D. Br2 adds easily to B than A. (1) B and C only (2) B, C and D only (3) A, C and D only (4) A and B only

Q35.Arrange the following gases in increasing order of van der Waals constant ′a′ (A) Ar (B) CH4 (C) H2O (D) C6H6 Choose the correct option from the following. (1) D, C, B and A (2) B, C, D and A (3) C, D, B and A (4) A, B, C and D

Q35.Gibbs energy vs T plot for the formation of oxides is given below. For the given diagram, the correct statement is- (1) At 600°C, CO cannot reduce FeO (2) At 600°C, CO can reduce ZnO (3) At 600°C, C can reduce ZnO (4) At 600°C, C can reduce FeO

Q35.Given below are two statements: Statement I: SbCl5 is more covalent than SbCl3 Statement II: The higher oxides of halogens also tend to be more stable than the lower ones. In the light of the above statements, choose the most appropriate answer from the options given below. (1) Statement I is incorrect but statement II is correct (2) Both Statement I and Statement II are incorrect (3) Both Statement I and Statement II are correct (4) Statement I is correct but statement II is incorrect

Q35.The number of following factors which affect the percent covalent character of the ionic bond is______ A) Polarising power of cation B) Extent of distortion of anion C) Polarisability of the anion D) Polarising power of anion

Q35.In an ice crystal, each water molecule is hydrogen bonded to _____ neighbouring molecules.

Q35.When the hydrogen ion concentration [H+]changes by a factor of 1000 , the value of pH of the solution (1) increases by 1000 units (2) decreases by 3 units (3) decreases by 2 units (4) increases by 2 units

Q35.Lithium aluminium hydride can be prepared from the reaction of (1) LiCl and Al2H6 (2) LiH and Al2Cl6 (3) LiCl, Al and H2 (4) LiH and AlOH3

Q35.The effect of addition of helium gas to the following reaction in equilibrium state at constant volume, is : PCI5( g) ⇌PCl3( g) + Cl2( g) JEE Main 2023 (01 Feb Shift 2) JEE Main Previous Year Paper (1) the equilibrium will shift in the forward direction (2) the equilibrium will go backward due to and more of Cl2 and PCl3 gases will be suppression of dissociation of PCl5 . produced. (3) helium will deactivate PCl5 and reaction will (4) addition of helium will not affect the equilibrium. stop.

Q35.Match items of column I and II Column I (Mixture of compounds) Column II (Separation Technique) A. H2O / CH2Cl2 i. Crystallization ii. Differential solvent extraction B. C. Kerosene/Naphthalene iii. Column chromatography D. C6H12O6 / NaCl iv. Fractional Distillation (1) A - ( iii ) , B - ( iv ) , C - ( ii ) , D - ( i ) (2) A - ( ii ) , B - ( iii ) , C - ( iv ) , D - ( i ) (3) A - ( i ) , B - ( iii ) , C - ( ii ) , D - ( iv ) (4) A - ( ii ) , B - ( iv ) , C - ( i ) , D - ( iii )

Q35.Amongst the following, the number of species having the linear shape is XeF2, I+3 , C3O2, I−3 , CO2, SO2, BeCl2 and BCl⊖2

Q35. ClF5 at room temperature is a (1) Colourless liquid with trigonal (2) Colourless gas with square pyramidal geometry bipyramidal geometry (3) Colourless gas with trigonal bipyramidal (4) Colourless liquid with square pyramidal geometry geometry