Practice Questions

Q52.For independent process at 300 K. Process 𝛥H / kJmol-1 𝛥S / JK-1 A -25 -80 B -22 40 C 25 -50 D 22 20 JEE Main 2023 (24 Jan Shift 1) JEE Main Previous Year Paper The number of non-spontaneous process from the following is _____ .

Q52.Match List I with List II JEE Main 2023 (25 Jan Shift 2) JEE Main Previous Year Paper List I List II Coordination entity Wavelength of light absorbed in nm A [CoCl (NH3)5]2+ I. 310 B [Co (NH3)6]3+ II. 475 C [Co(CN)6]3− III. 535 D [Cu (H2O)4]2+ IV. 600 Choose the correct answer from the options given below :- (1) A −IV, B −I, C −III, D −II (2) A −III, B −II, C −I, D −IV (3) A −III, B −I, C −II, D −IV (4) A − II, B −III, C −IV, D −I

Q52.Which halogen is known to cause the reaction given below? (1) All halogens (2) Only Bromine (3) Only Iodine (4) Only Chlorine

Q52.Which of the following elements have half-filled f-orbitals in their ground state ? (Given : atomic number Sm −62; Eu = 63; Tb = 65; Gd = 64, Pm = 61) Choose the correct answer from the options given below : (1) A and B only (2) C and D only (3) B and D only (4) A and E only

Q52.One mole of P4 reacts with 8 moles of SOCl2 to give 4 moles of A , x mole of SO2 and 2 moles of B . A, B and x respectively are (1) POCl3, S2 Cl2 and 2 (2) PCl3, S2 Cl2 and 4 (3) PCl3, S2 Cl2 and 2 (4) POCl3, S2 Cl2 and 4

Q52.Which of the following cannot be explained by crystal field theory? (1) The order of spectrochemical series (2) Magnetic properties of transition metal complexes (3) Colour of metal complexes (4) Stability of metal complexes

Q52.Solid fuel used in rocket is a mixture of Fe2O3 and Al (in ratio 1 : 2). The heat evolved ( kJ ) per gram of the mixture is _____ (Nearest integer) Given ΔHf0Al2O3 = - 1700 kJ mol-1 ΔHf0Fe2O3 = - 840 kJ mol-1 Molar mass of Fe, AI and O are 56, 27 and 16 g mol – 1 respectively

Q52.Given below are two statements: one is labelled as “Assertion A” and the other is labelled as “Reason R” Assertion A : In the complex Ni(CO)4 and Fe(CO)5 , the metals have zero oxidation state. Reason R : Low oxidation states are found when a complex has ligands capable of π-donor character in addition to the σ -bonding. JEE Main 2023 (06 Apr Shift 2) JEE Main Previous Year Paper In the light of the above statements, choose the most appropriate answer from the options given below (1) A is correct but R is not correct (2) A is not correct but R is correct (3) Both A and R are correct but R is NOT the (4) Both A and R are correct and R is the correct correct explanation of A explanation of A

Q52.Electrons in a cathode ray tube have been emitted with a velocity of 1000 ms-1. The number of following statements which is/are true about the emitted radiation is Given : h = 6 × 10-34Js, me = 9 × 10-31 kg (A ) The deBroglie wavelength of the electron emitted is 666 . 67 nm (B ) The characteristic of electrons emitted depend upon the material of the electrodes of the cathode ray tube. (C) The cathode rays start from cathode and move towards anode. (D ) The nature of the emitted electrons depends on the nature of the gas present in cathode ray tube..

Q52.When 2 litre of ideal gas expands isothermally into vacuum to a total volume of 6 litre, the change in internal energy is _____ J. (Nearest integer) Q53.600mL of 0 . 01M HCl is mixed with 400mL of 0 . 01M H2SO4. The pH of the mixture is _____ × 10-2. (Nearest integer) [Given log2 = 0 . 30, log3 = 0 . 48, log5 = 0 . 69, log7 = 0 . 84, log11 = 1 . 04]

Q52.For a metal ion, the calculated magnetic moment is 4 . 90 BM. This metal ion has _______ number of unpaired electrons

Q52.The wavelength of an electron of kinetic energy 4 . 50 × 10-29 J is ________ × 10 – 5 m . (Nearest integer) Given: mass of electron is9 × 10 – 31 kg, h = 6 . 6 × 10 – 34 Js

Q52.Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Cu2+ in water is more stable than Cu+ . Reason (R) : Enthalpy of hydration for Cu2+ is much less than that of Cu+ . In the light of the above statements, choose the correct answer from the options given below : (1) Both (A) and (R) are correct and (R) is the (2) (A) is correct but (R) is not correct. 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).

Q53.Chiral complex from the following is : Here en = ethylene diamine (1) cis −[PtCl2(en)2]2+ (2) trans −[PtCl2(en)2]2+ (3) cis −[PtCl2 (NH3)2] (4) trans −[Co (NH3)4 Cl2]+

Q53.Which element is not present in Nessler’s reagent? (1) Mercury (2) Potassium (3) Iodine (4) Oxygen

Q53.If Ni2+ is replaced by Pt2+ in the complex [NiCl2 Br2]2− , which of the following properties are expected to get changed? A. Geometry B. Geometrical isomerism C. Optical isomerism D. Magnetic properties (1) A and D (2) A, B and C (3) B and C (4) A, B and D

Q53.The number of molecules from the following which contain only two lone pair of electrons is _____________ H2O, N2, CO, XeF4, NH3, NO, CO2, F2

Q53.The enthalpy change for the conversion of 1 (g) to Cl- ( aq ) is ( - ) 2Cl2 kJmol-1 (Nearest integer) JEE Main 2023 (31 Jan Shift 1) JEE Main Previous Year Paper Given : 𝛥dis HCl20 ( g ) = 240kJmol-1. 𝛥egHClo ( g ) = - 350kJmol-1, - = - 380kJmol-1 𝛥hydHClo ( g ) ( g) ⇌SO3 ( g) KP = 2 × 1012 at 27°C and 1 atm pressure. The Kc for

Q53.Which of the following complex is octahedral, diamagnetic and the most stable? (1) Na3[CoCl6] (2) [Ni (NH3)6] Cl2 (3) K3[Co(CN)6] (4) [Co (H2O)6] Cl2

Q53.Total number of moles of AgCl precipitated on addition of excess of AgNO3 to one mole each of the following complexes [Co (NH3)4 Cl2] Cl, [Ni (H2O)6] Cl2, [Pt (NH3)2 Cl2] and [Pd (NH3)4] Cl2 is

Q53.The dissociation constant of acetic is x × 10 – 5 . When 25 mL of 0 . 2 M CH3COONa solution is mixed with 25 mL of 0 . 02 M CH3COOH solution, the pH of the resultant solution is found to be equal to 5. The value of x is _______.

Q53.Match List I with List II List I Complex List II CFSE (Δ0) A. [Cu(NH3)6]2+ I. −0. 6 B. [Ti(H2O)6]3+ II. −2. 0 C. [Fe(CN)6]3− III. −1. 2 D. [NiF6]4− IV. −0. 4 Choose the correct answer from the options given below: (1) A(III), B(IV), C(I), D(II) (2) A(I), B(IV), C(II), D(III) (3) A(I), B(II), C(IV), D(III) (4) A(II), B(III), C(I), D(IV)

Q53.The number of species from the following which have square pyramidal structure is _______ PF5, BrF4- , IF5, BrF5, XeOF4, ICl4-

Q53.The total change in the oxidation state of manganese involved in the reaction of KMnO4 and potassium iodide in the acidic medium is ________.

Q53.Match List-I with List-II LIST-I LIST-II Coordination Number of unpaired electrons Complex A. [Cr(CN)6]3− I. 0 B. [Fe (H2O)6]2+ II. 3 C. [Co (NH3)6]3+ III. 2 JEE Main 2023 (08 Apr Shift 2) JEE Main Previous Year Paper D. [Ni (NH3)6]2+ IV. 4 Choose the correct answer from the options given below: (1) A-II, B-IV, C-I, D-III (2) A-III, B-IV, C-I, D-II (3) A-II, B-I, C-IV, D-III (4) A-IV, B-III, C-II, D-I