Practice Questions

Q51.Among following compounds, the number of those present in copper matte is A. CuCO3 B. Cu2 S C. Cu2 O D. FeO

Q52.The sum of lone pairs present on the central atom of the interhalogen IF5 and IF7 is ______

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.The orbital angular momentum of an electron in 3 s orbital is 2π.xh The value of Q53.20 mL of 0 . 1MNaOH is added to 50 mL of 0 . 1M acetic acid solution. The pH of the resulting solution is × 10-2. (Nearest integer) Given : pK𝑎CH3COOH = 4 . 76 log 2 = 0 . 30 log 3 = 0 . 48

Q52.The ratio of sigma and π bonds present in pyrophosphoric acid is

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.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.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.How many of the following metal ions have similar value of spin only magnetic moment in gaseous state? ________ (Given: Atomic number : V, 23; Cr, 24; Fe, 26; Ni, 28) V3+, Cr3+, Fe2+, Ni3+

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.Zinc reacts with hydrochloric acid to give hydrogen and zinc chloride. The volume of hydrogen gas produced at STP from the reaction of 11 . 5 g of zinc with excess HCl is L (Nearest integer) (Given : Molar mass of Zn is 65 . 4 g mol-1 and Molar volume of H2 at STP = 22 . 7 L )

Q53.If the CFSE of [Ti (H2O)6]3+ is −96. 0 kJ / mol, this complex will absorb maximum at wavelength nm. (nearest integer) Assume Planck' constant (h) = 6. 4 × 10−34 Js, Speed of light (c) = 3. 0 × 108 m/s and Avogadro's constant (NA) = 6 × 1023/ mol. JEE Main 2023 (31 Jan Shift 2) JEE Main Previous Year Paper

Q53.At 25°C, the enthalpy of the following processes are given: H2 ( g) + O2 ( g) →2OH(g)𝛥Ho = 78 kJ mol-1 H2 ( g) + 1 / 2O2 ( g) →H2O(g)𝛥H0 = - 242 kJ mol-1 H2 ( g) →2H(g)𝛥Ho = 436 kJ mol-1 1 / 2O2 ( g) →O(g)𝛥H0 = 249 kJ mol-1 What would be the value of X for the following reaction? (Nearest integer) JEE Main 2023 (01 Feb Shift 1) JEE Main Previous Year Paper H2Og →Hg + OHg ∆Ho = X kJmol-1

Q53.At constant temperature, a gas is at a pressure of 940 . 3 mm Hg. The pressure at which its volume decreases by 40% is ______ mm Hg. (Nearest integer) +2 . 2 V +0 . 70 V -0 . 45 V 2 - ⟶ Fe3 + ⟶ Fe2 + ⟶ Fe0

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

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 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.The denticity of the ligand present in the Fehling's reagent is _____ .

Q53.A mixture of one mole of H2O and 1 mole of CO is taken in a 10 litre container and heated to 725 K. At equilibrium 40% of water by mass reacts with carbon monoxide according to the equation: COg + H2Og ⇌ CO2g + H2g. The equilibrium constant KC × 102 for the reaction is ________ (Nearest integer)

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

Q54.(i) X(g) ⇌Y(g) + Z(g) Kp1 = 3 (ii) A(g) ⇌2 B( g) Kp2 = 1 If the degree of dissociation and initial concentration of both the reactants X ( g ) and A ( g ) are equal, then 𝑝1 the ratio of the total pressure at equilibrium is equal to x: 1. The value of x is (Nearest integer) 𝑝2

Q54.FeO4 θ EFeO42 - / Fe2 + is x × 10-3 V. The value of x is _______