Practice Questions

Q37.Given that the standard potentials (Eo) of Cu2+ / Cu and Cu+ / Cu are 0.34V and 0.522V respectively, the Eo of Cu2+ / Cu+ is: (1) 0.182V (2) +0.158V (3) −0.182V (4) −0.158V

Q37.The variation of molar conductively with concentration of an electrolyte (X) in aqueous solution is shown in the given figure. The electrolyte X is : (1) HCl (2) NaCl (3) KNO3 (4) CH3 COOH

Q37.The d-electron configuration of [Ru(en)3] Cl2 , and [Fe (H2O)6] Cl2 respectively are: (1) t62ge0g and t62ge0g (2) t42ge2g and t62ge0g (3) t62ge0g and t42ge2g (4) t42ge2g and t42ge2g

Q37.A sample of red ink (a colloidal suspension) is prepared by mixing eosine dye, egg white, HCHO and water. The component which ensures stability of the ink sample is : (1) Egg white (2) Water (3) HCHO (4) Eosin dye

Q38.The major product in the following reaction is: (1) (2) (3) (4)

Q38.The decreasing order of reactivity of the following compounds towards nucleophilic substitution ( SN2 ) is: (1) (II) > (III) > (I) > (IV) (2) (II) > (III) > (IV) > (I) (3) (III) > (II) > (IV) > (I) (4) (IV) > (II) > (III) > (I)

Q38.Reaction of an inorganic sulphite X with dilute H2 SO4 generated compound Y . Reaction of Y with NaOH gives X . Further, the reaction of X with Y and water affords compound Z, Y and X , respectively, are : (1) SO2 and Na2 SO3 (2) SO3 and NaHSO3 (3) SO2 and NaHSO3 (4) S and Na2 SO3

Q38.As per Hardy-Schulze formulation, the flocculation values of the following for ferric hydroxide sol are in the order: (1) K3[Fe(CN)6] < K2CrO4 < KBr = KNO3 = AlCl3K3[Fe(CN)6](2) < K2CrO4 < AlCl3 < KBr < KNO3 (3) AlCl3 > K3[Fe(CN)6] > K2CrO4 > KBr = KNO3K3[Fe(CN)6](4) > AlCl3 > K2CrO4 > KBr > KNO3

Q38.According to the following diagram, A reduces BO2 when the temperature is: (1) < 1400oC (2) > 1400oC (3) > 1200oC but < 1400oC (4) < 1200oC

Q38.The structure of PCl5 in the solid state is : (1) tetrahedral [PC4]+ and octahedral [PCl6]− (2) square planar [PCl4]+ and octahedral [PCl6]− (3) square pyramidal (4) trigonal bipyramidal

Q38.Among statements (a) – (d), the correct ones are : (a) Lime stone is decomposed to CaO during the extraction of iron from its oxides. (b) In the extraction of silver, silver is extracted as an anionic complex. (c) Nickel is purified by Mond’s process. (d) Zr and Ti are purified by Van Arkel method. (1) (a), (b), (c) and (d) (2) (a), (c) and (d) only (3) (b), (c) and (d) only (4) (c) and (d) only

Q38.The rate constant (k) of a reaction is measured at different temperature (T), and the data are plotted in the given figure. the activation energy of the reaction in kJmol−1 is : (R is gas constant) JEE Main 2020 (05 Sep Shift 2) JEE Main Previous Year Paper (1) 2/R (2) 1/R (3) R (4) 2R

Q38.The correct statement with respect to dinitrogen is: (1) N2 is paramagnetic in nature. (2) it can combine with dioxygen at 25°C (3) liquid dinitrogen is not used in cryosurgery. (4) it can be used as an inert diluent for reactive chemicals

Q38.The major product in the following reaction is : JEE Main 2020 (02 Sep Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q38.In the following reactions, products (A) and (B) , respectively, are: NaOH + Cl2 →(A) + side products (hot and conc. ) Ca(OH)2 + Cl2 →(B) + side products (dry) (1) NaClO3 and Ca(OCl)2 (2) NaClO3 and Ca(ClO3)2 (3) NaOCl and Ca(OCl)2 (4) NaOCl and Ca(ClO3)2

Q39.The electronic configurations of bivalent europium and trivalent cerium are: (atomic number: Xe = 54 , Ce = 58 , Eu = 63) (1) [Xe]4f 2 and [Xe]4f 7 (2) [Xe]4f 7 and [Xe]4f 1 (3) [Xe]4f 76s2 and [Xe]4f 26s2 (4) [Xe]4f 4 and [Xe]4f 9

Q39.The correct electronic configuration and spin-only magnetic moment (BM) of Gd3+(Z = 64), respectively, are : (1) [Xe]4f 7 and 8. 9 (2) [Xe]4f 7 and 7. 9 (3) [Xe]5f 7 and 8. 9 (4) [Xe]5f 7 and 7. 9

Q39.Simplified absorption spectra of three complexes ((i) and (ii) and (iii)) of M+n ion are provided below; their λmax values are marked as A, B and C respectively. The correct match between the complexes and their λmax JEE Main 2020 (02 Sep Shift 2) JEE Main Previous Year Paper values is: (i) [M(NCS)6](−6+n) (ii) [MF6](−6+n) (iii) [M(NH3)6]n+ (1) A −(iii), (B) −(i), C −(ii) (2) A −(ii), (B) −(i), C −(iii) (3) A −(ii), (B) −(iii), C −(i) (4) A −(i), (B) −(ii), C −(iii)

Q39.White phosphorus on reaction with concentrated NaOH solution in an inert atmosphere of CO2 gives phosphine and compound (X). (X) on acidification with HCl gives compound (Y ). The basicity of compound (Y ) is: (1) 2 (2) 1 (3) 4 (4) 3

Q39.The atomic radius of Ag is closest to (1) Au (2) Ni (3) Cu (4) Hg

Q39.The number of bonds between sulphur and oxygen atoms in S2O2−8 and the number of bonds between sulphur and sulphur atoms in rhombic sulphur, respectively are: (1) 4 and 6 (2) 8 and 8 (3) 8 and 6 (4) 4 and 8

Q39.The number of possible optical isomers for the complexes MA2B2 with sp3 and dsp2 hybridized metal atom, respectively, is: Note: A and B are unidentate neutral and unidentate monoanionic ligands, respectively. (1) 0 and 2 (2) 2 and 2 (3) 0 and 0 (4) 0 and 1

Q39.The statement that is not true about ozone is : (1) in the stratosphere, CFCs release chlorine free (2) in the atmosphere, it is depleted by CFCs. radicals (CI) which reacts with O3 to give chlorine (3) in the stratosphere, it forms a protective shield (4) It is a toxic gas and its reaction with NO gives against UV radiation. NO2

Q39.The Crystal Field Stabilization Energy (CFSE) of [CoF 3(H2O)3](Δ0 < P) is : (1) −0. 8 Δ0 + 2P (2) −0. 4 Δ0 (3) −0. 8 Δ0 (4) −0. 4 Δ0 + P

Q39.Adsorption of a gas follows Freudlich adsorption isotherm. If x is the mass of the gas adsorbed on mass m of the adsorbent, the correct plot of x versus p is: m (1) (2) (3) (4)