Practice Questions

Q33.A litre of buffer solution contains 0. 1 mole of each of NH3 and NH4 Cl. On the addition of 0. 02 mole of HCl by dissolving gaseous HCl , the pH of the solution is found to be _____ × 10−3 (Nearest integer) Given: pKb(NH3) = 4. 745 log 2 = 0. 301 log 3 = 0. 477 T = 298 K]

Q33.Match List I with List II List II List I (No. of lone pairs of e- (molecules/ions) on central atom) (A) IF7 I. Three (B) ICl4- II. One (C) XeF6 III. Two (D) XeF2 IV. Zero Choose the correct answer from the options given below: (1) A - II, B - III, C - IV, D - I (2) A - IV, B - III, C - II, D - I (3) A - II, B - I, C - IV, D - III (4) A - IV, B - I, C - II, D - III

Q33.Match List I with List II List I List II A. XeF4 I.See-saw B. SF4 II. Square planar JEE Main 2023 (31 Jan Shift 1) JEE Main Previous Year Paper C. NH4+ III. Bent T - shaped D.BrF3 IV. Tetrahedral Choose the correct answer from the options given below : (1) A - IV, B - III, C - II, D - I (2) A - II, B - I, C - III, D - IV (3) A - IV, B - I, C - II, D - III (4) A - II, B - I, C - IV, D - III

Q33.Strong reducing and oxidizing agents among the following , respectively, are (1) Ce3 + and Ce4 + (2) Ce4 + and Tb4 + (3) Ce4 + and Eu2 + (4) Eu2 + and Ce4 +

Q33.Group- 13 elements react with O2 in amorphous form to form oxides of type M2O3 ( M = element). Which among the following is the most basic oxide? (1) Al2 O3 (2) B2O3 (3) Tl2 O3 (4) Ga2 O3

Q33.Given below are two statements : Statement I : SO2 and H2O both possess V-shaped structure Statement II : The bond angle of SO2 is less than that of H2O. In the light of the above statements, choose the most appropriate answer from the options given below: (1) Both Statement I and Statement II are incorrect (2) Both Statement I and Statement II are correct (3) Statement I is incorrect but Statement II is correct(4) Statement I is correct but Statement II is incorrect

Q33.Arrange the following orbitals in decreasing order of energy. A. n = 3, l = 0, m = 0 B. n = 4, l = 0, m = 0 C. n = 3, l = 1, m = 0 D. n = 3, l = 2, m = 1 The correct option for the order is: (1) D > B > C > A (2) B > D > C > A (3) A > C > B > D (4) D > B > A > C

Q33.The number of correct statements from the following is ........... A. For 1s orbital, the probability density is maximum at the nucleus B. For 2s orbital, the probability density first increases to maximum and then decreases sharply to zero. C. Boundary surface diagrams of the orbitals encloses a region of 100% probability of finding the electron. D. p and d -orbitals have 1 and 2 angular nodes respectively E. probability density of p -orbital is zero at the nucleus

Q33.Sum of π-bonds present in peroxodisulphuric acid and pyrosulphuric acid is

Q33.Which of the following statement(s) is/are correct? (A) The pH of 1 × 10–8 M HCl solution is 8. (B) The conjugate base of H2 PO4− is HPO2−4 . (C) Kw increases with increase in temperature. (D) When a solution of a weak monoprotic acid is titrated against a strong base at half neutralisation point, pH = 21 pKa . Choose the correct answer from the options given below: (1) (B), (C) (2) (A), (D) (3) (A), (B), (C) (4) (B), (C), (D)

Q33.Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : The energy required to form Mg2 + from Mg is much higher than that required to produce Mg+ Reason R:Mg2 + is small ion and carry more charge than Mg+ In the light of the above statements, choose the correct answer from the options given below. (1) Both A and R are true but R is NOT 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 and R is the correct explanation of A

Q33.According to MO theory the bond orders for O22−CO, and NO+ respectively, are (1) 1, 3 and 3 (2) 1, 3 and 2 (3) 1, 2 and 3 (4) 2, 3 and 3

Q33.Choose the correct statement(s): A. Beryllium oxide is purely acidic in nature. B. Beryllium carbonate is kept in the atmosphere of CO2. C. Beryllium sulphate is readily soluble in water. D. Beryllium shows anomalous behavior. Choose the correct answer from the options given below: JEE Main 2023 (01 Feb Shift 1) JEE Main Previous Year Paper (1) A, B and C only (2) B,C and D only (3) A and B only (4) A only

Q33.Bond dissociation energy of E −H bond of the " H2E" hydrides of group 16 elements (given below), follows order. (A) O (B) S (C) Se (D) Te (1) A > B > C > D (2) A > B > D > C (3) B > A > C > D (4) D > C > B > A Q34. 1 mole of ideal gas is allowed to expand reversibly and adiabatically from a temperature of 27°C. The work done is 3 kJ mol−1 . The final temperature of the gas is _____ K (Nearest integer). Given Cv = 20 J mol−1 K−1

Q34.The bond order and magnetic property of acetylide ion are same as that of (1) O2+ (2) N2+ (3) NO+ (4) O2−

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.For 1 mol of gas, the plot of pV vs p is shown below. p is the pressure and V is the volume of the gas. JEE Main 2023 (29 Jan Shift 1) JEE Main Previous Year Paper What is the value of compressibility factor at point A ? (1) 1 − RTVa (2) 1 + Vb (3) 1 −bV (4) 1 + RTVa

Q34.Match Column I with Column II Column I Column II A Soda ash I CaSO4 B Chlorophyll II CaOH2 C Used in Whitewashing III Na2CO3 D Dentistry, ornamental work IV Mg2 + ions (1) A – III, B – IV, C – I, D – II (2) A – II, B – I, C – III, D – IV (3) A – III, B – I, C – II, D – IV (4) A – II, B – III, C – IV, D – I

Q34.For elements B, C, N Li, Be, O and F, the correct order of first ionisation enthalpy is (1) Li < Be < B < C < O < N < F (2) B < Li < Be < C < N < O < F (3) Li < Be < B < C < N < O < F (4) Li < B < Be < C < O < N < F

Q34.The enthalpy change for the adsorption process and micelle formation respectively are (1) ΔHads > 0 and ΔHmic < 0 (2) ΔHads > 0 and ΔHmic > 0 (3) ΔHads < 0 and ΔHmic > 0 (4) ΔHads < 0 and ΔHmic < 0

Q34.The number of species trom the following carrying a single lone pair on central atom Xenon is XeF+5 , XeO3, XeO2 F2, XeF−5 , XeO3 F2, XeOF4, XeF4

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.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.The correct order of metallic character is (1) K > Be > Ca (2) Be > Ca > K (3) Ca > K > Be (4) K > Ca > Be