Practice Questions

Q59.When 9 . 45 g of ClCH2COOH is added to 500 mL of water, its freezing point drops by 0 . 5°C . The dissociation constant of ClCH2COOH is 𝑥× 10-3 . The value of x is off to the nearest integer) KfH2O = 1 . 86 K kg mol-1

Q59.The first order rate constant for the decomposition of CaCO3 at 700 K is 6. 36 × 10−3 s−1 and activation energy is 209 kJ mol−1 . Its rate constant (in s−1) at 600 K is x × 10−6 . The value of x is (Nearest integer) [Given R = 8. 31 J K−1 mol−1; log 6. 36 × 10−3 = −2. 19, 10−4.79 = 1. 62 × 10−5]

Q59.A xenon compound A upon partial hydrolysis gives XeO2 F2 . The number of lone pair of electrons present in compound A is ___ (Round off to the Nearest integer)

Q59.For a chemical reaction A →B , it was found that concentration of B is increased by 0. 2 mol L−1 in 30 min. The average rate of the reaction is ________ ×10−1 mol L−1 h−1 . (in nearest integer)

Q59.In the ground state of atomic Fe(Z = 26), the spin-only magnetic moment is ×10−1 BM. (Round off to the Nearest Integer). [ Given : √3 = 1. 73, √2 = 1. 41]

Q59.In Carius method for estimation of halogens, 0. 2 g of an organic compound gave 0. 188 g of AgBr. The percentage of bromine in the compound is __________. (Nearest integer) [Atomic mass: Ag = 108, Br = 80 ] Q60. 1 mol of an octahedral metal complex with formula MCl3 ⋅2 L on reaction with excess of AgNO3 gives 1 mol of AgCl. The denticity of Ligand L is___________ (Integer answer)

Q59.Among the following allotropic forms of sulphur, the number of allotropic forms, which will show paramagnetism is _______. (A) α -sulphur (B) β -sulphur (C) S2 -form JEE Main 2021 (24 Feb Shift 2) JEE Main Previous Year Paper

Q59.The spin only magnetic moment of a divalent ion in aqueous solution (atomic number 29) is ___ BM.

Q59.CH4 is adsorbed on 1 g charcoal at 0°C following the Freundlich adsorption isotherm. 10 . 0 mL of CH4 is adsorbed at 100 mm of Hg, whereas 15 . 0 mL is adsorbed at 200 mm of Hg . The volume of CH4 adsorbed at 300 mm of Hg is 10x mL . The value of x is _________ × 10-2 . (Nearest integer) [Use log102 = 0 . 3010, log103 = 0 . 4771]

Q59.The overall stability constant of the complex ion [Cu (NH3)4]2+ is 2. 1 × 1013. The overall dissociation constant is y × 10−14 . Then y is (Nearest integer)

Q59.For coagulation of 50 mL of a sol, 10 mL of 0.5M Cl- ion solution is required. What is the coagulating value of Cl− ion solution (Nearest integer) NOTE: NTA question has been changed because it had errors.}

Q59.Consider the cell at 25°C ZnZn2 + aq, 1 M‖Fe3 + (aq), Fe2 + aqPts The fraction of total iron present as Fe3 + ion at the cell potential of 1 . 500 V is x × 10-2. The value of x is ______. (Nearest integer) Given: E∘ + + = 0 . 77V, E∘ + = - 0 . 76V Fe3 | Fe2 Zn2 | Zn

Q59.The number of halogen/(s) forming halic (V) acid is __________ .

Q59.If the activation energy of a reaction is 80. 9 kJ mol−1 , the fraction of molecules at 700 K, having enough energy to react to form products is e−x . The value of x is (Rounded off to the nearest integer) [Use R = 8. 31 J K−1 mol−1 ]

Q59.To synthesise 1 mole of 2−methylpropan −2−ol from Ethylethanoate equivalents of CH3 MgBr reagent will be required. (Integer value)

Q59.The number of 4f electrons in the ground state electronic configuration of Gd2+ is [Atomic number of Gd = 64]

Q60.The total number of amines among the following which can be synthesized by Gabriel synthesis is ________.

Q60.In the electrolytic refining of blister copper, the total number of main impurities, from the following, removed as anode mud is ___________ . Pb, Sb, Se, Te, Ru, Ag, Au and Pt

Q60.In Tollen's test for aldehyde, the overall number of electron(s) transferred to the Tollen's reagent formula [Ag (NH3)2]+ per aldehyde group to form silver mirror is ___.(Round off to the Nearest integer)

Q60.The number of nitrogen atoms in a semicarbazone molecule of acetone is_____

Q60.Number of electrons present in 4f orbital of Ho3+ ion is ________ (Given Atomic No. of Ho =67)

Q60.The number of geometrical isomers possible in triamminetrinitrocobalt (III) is X and in trioxalatochromate (III) is Y. Then the value of X + Y is ____.

Q60.A metal surface is exposed to 500 nm radiation. The threshold frequency of the metal for photoelectric current is 4. 3 × 1014 Hz . The velocity of ejected electron is ___ × 105 ms−1 (Nearest integer) [Use : h = 6. 63 × 10−34 Js, me = 9. 0 × 10−31 kg] p and q are roots of the equation : + = + i)100 299(p iq), then

Q60.The number of stereo isomers possible for [Co (ox)2(Br)(NH3)]2− is __________. [ ox = oxalate] JEE Main 2021 (26 Feb Shift 2) JEE Main Previous Year Paper

Q60.Three moles of AgCl get precipitated when one mole of an octahedral co-ordination compound with empirical formula CrCl3 . 3NH3 . 3H2O reacts with excess of silver nitrate. The number of chloride ions satisfying the secondary valency of the metal ion is ______ .