Practice Questions

Q32.The volume of hydrogen liberated at STP by treating 2. 4 g of magnesium with excess of hydrochloric acid is ...... ×10−2 L. Given Molar volume of gas is 22. 4 L at STP. Molar mass of magnesium is 24 g mol−1

Q32.The correct increasing order of the ionic radii is (1) Cl- < Ca2 + < K+ < S2 - (2) K+ < S2 - < Ca2 + < Cl- (3) S2 - < Cl- < Ca2 + < K+ (4) Ca2 + < K+ < Cl- < S2 -

Q32.Which one of the following sets of ions represents a collection of isoelectronic species? (Given : Atomic Number : F : 9, Cl : 17, Na = 11 Mg = 12, Al = 13, K = 19, Ca = 20, Sc = 21) (1) (Li+, Na+, Mg2+, Ca2+ (2) (Ba2+, Sr2+, K+, Ca2+ (3) (N3−, O2−, F−, S2− (4) (K+, Cl−, Ca2+, Sc3+

Q32.Given below are two statement : one is labelled as Assertion A and the other is labelled as Reason R Assertion A : 5f electron can participate in bonding to a far greater extent than 4f electrons Reason R : 5f orbitals are not as buried as 4f orbitals 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) Both A and R are true and R is the correct 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

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.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.The number of atomic orbitals from the following having 5 radial nodes is 7s, 7p, 6s, 8p, 8d

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.Statement I:- Dipole moment is a vector quantity and by convention it is depicted by a small arrow with tail on the negative centre and head pointing towards the positive centre. Statement II:- The crossed arrow of the dipole moment symbolizes the direction of the shift of charges in the molecules. 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 correct. (2) Statement I is incorrect but Statement II is correct. (3) Both Statement I and Statement II are incorrect. (4) Statement I is correct but Statement II is incorrect. Q34. 28. 0 L of CO2 is produced on complete combustion of 16. 8 L gaseous mixture of ethene and methane at 25°C and 1 atm. Heat evolved during the combustion process is kJ Given : ΔHC(CH4) = −900 kJ mol−1 ΔHC(C2H4) = −1400 kJ mol−1 .

Q33.Which of the following statements are not correct? A. The electron gain enthalpy of F is more negative than that of Cl. B. Ionization enthalpy decreases in a group of periodic table. C. The electronegativity of an atom depends upon the atoms bonded to it. D. Al2 O3 and NO are examples of amphoteric oxides. Choose the most appropriate answer from the options given below: (1) A, B, C and D (2) A, B and D only (3) B and D only (4) A, C and D only

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

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.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.The correct order of electronegativity for given elements is (1) P > Br > C > At (2) Br > P > At > C (3) Br > C > At > P (4) C > P > At > Br

Q33.Values of work function (W0) for a few metals are given below Metal Li Na K Mg Cu Ag W0 eV 2. 42 2. 3 2. 25 3. 7 4. 8 4. 3 The number of metals which will show photoelectric effect when light of wavelength 400 nm falls on it is _____ Given: h = 6. 6 × 10–34 J s c = 3 × 108 ms–1 e = 1. 6 × 10–19 C

Q33.The number of molecules or ions from the following, which do not have odd number of electrons are _____ . (A) NO2 (B) ICl−4 (C) BrF3 (D) ClO2 (E) NO+2 (F) NO

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.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

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.For compound having the formula GaAlCl4, the correct option from the following is (1) Ga is coordinated with CI in GaAlCl4 (2) Ga is more electronegative than AI and is present as a cationic part of the salt GaAlCl4 (3) CI forms bond with both AI and Ga in GaAlCl4 (4) Oxidation state of Ga in the salt GaAlCl4 is + 3

Q33.For electron gain enthalpies of the elements denoted as ΔegH , the incorrect option is : (1) ΔegH(Cl) < ΔegH(F) (2) ΔegH(Se) < ΔegH(S) (3) ΔegH(I) < ΔegH(At) (4) ΔegH(Te) < ΔegH(Po) Q34. 0. 3 g of ethane undergoes combustion at 27°C in a bomb calorimeter. The temperature of calorimeter system (including the water) is found to rise by 0. 5°C . The heat evolved during combustion of ethane at constant pressure is kJmol−1 . (Nearest integer) [Given : The heat capacity of the calorimeter system is 20 kJ K−1, R = 8. 3 JK−1 mol−1 . Assume ideal gas behaviour. Assume ideal gas behaviour. Atomic mass of C and H are 12 and 1 g mol−1 respectively]

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.Order of Covalent bond; A. KF > KI; LiF > KF B. KF < KI; LiF > KF C. SnCl4 > SnCl2; CuCl > NaCl D. LiF > KF; CuCl > NaCl E. KF < KI; CuCl > NaCl (1) C, E Only (2) B, C Only (3) B, C, E Only (4) A, B Only