Practice Questions

Q41.For a reaction of order n, the unit of the rate constant is : (1) mol1−n L1−ns (2) mol1−n L2ns−1 (3) mol1−n Ln−1 s−1 (4) mol1−n L1−ns−1

Q42.Which one of the following lanthanides exhibits +2 oxidation state with diamagnetic nature ? (Given Z for Nd = 60, Yb = 70, La = 57, Ce = 58) (1) Nd (2) Yb (3) Ce (4) La

Q42.Match List-I and List-II : List-I List-II a Haematite i Al2 O3 ⋅xH2 O b Bauxite ii Fe2 O3 c Magnetite iii CuCO3 ⋅Cu(OH)2 d Malachite iv Fe3 O4 Choose the correct answer from the options given below : (1) (a )-( ii ), ( b )-( iii ),( c )-( i ),( d )-( iv) (2) (a )-( iv ) , (b) −(i), (c) −(ii), (d) −(iii) (3) (a )-( i ), ( b )-( iii ), ( c )-( ii ), ( d )-( iv) (4) (a) −(ii), (b) −(i), (c) −(iv), (d) −(iii)

Q42.Match List-I with List-II : List-I List-II Industrial process Application (a) Haber's process (i) HNO3 synthesis (b) Ostwald's process (ii) Aluminium extraction (c) Contact process (iii) NH3 synthesis (d) Hall-Heroult process (iv) H2 SO4 synthesis Choose the correct answer from the options given below: (1) (a) −(ii), (b) −(iii), (c) −(iv), (d) −(i) (2) (a) −(iii), (b) −(iv), (c) −(i), (d) −(ii) (3) (a) −(iii), (b) −(i), (c) −(iv), (d) −(ii) (4) (a) −(iv), (b) −(i), (c) −(ii), (d) −(iii)

Q42.Match List −I with List −II List −I List −II (a) Chlorophyll (i) Ruthenium (b) Vitamin −B12 (ii) Platinum (c) Anticancer drug (iii) Cobalt (d) Grubbs catalyst (iv) Magnesium Choose the most appropriate answer from the options given below: (1) a −iii , b −ii, c −iv, d −i (2) a −iv, b −iii , c −ii, d −i (3) a −iv, b −iii, c −i, d −ii (4) a −iv, b −ii, c −iii, d −i

Q42.In the given chemical reaction, colors of theFe2 + and Fe3 + ions, are respectively : 5Fe2 + + MnO4- + 8H+ →Mn2 + + 4H2O + 5Fe3 + (1) Yellow, Green (2) Yellow, Orange (3) Green, Orange (4) Green, Yellow

Q42.The electrode potential of M2 + / M of 3 d-series elements shows positive value for? (1) Co (2) Fe (3) Zn (4) Cu

Q42.Given below are two statements. Statement I: The choice of reducing agents for metals extraction can be made by using the Ellingham diagram, a plot of ΔG vs temperature. Statement II: The value of ΔS increases from left to right in the Ellingham diagram. In the light of the above statements, choose the most appropriate answer from the options given below: (1) Statement I is false but Statement II is true (2) Both Statement I and Statement II are true (3) Statement I is true but Statement II is false (4) Both Statenent I and Statement II are false

Q42.The incorrect statement among the following is: (1) Cr2 O3 is an amphoteric oxide (2) VOSO4 is a reducing agent (3) RuO4 is an oxidizing agent (4) Red colour of ruby is due to the presence of Co3+

Q42.The additon of dilute NaOH to Cr3+ salt solution will give : (1) a solution of [Cr(OH)4]− (2) precipitate of [Cr(OH)6]3− (3) precipitate of Cr2 O3(H2O)n (4) precipitate of Cr(OH)3

Q42.In Freundlich adsorption isotherm at moderate pressure, the extent of adsorption ( mx ) is directly proportional to Px . The value of x is : (1) zero (2) 1 n (3) 1 (4) ∞

Q42.Arrange the following metal complex/ compounds in the increasing order of spin only magnetic moment. Presume all the three, high spin system. (Atomic numbers Ce = 58, Gd = 64 and Eu = 63.) (a) (NH4)2[Ce (NO3)6] (b) Gd (NO3)3 and (c) Eu (NO3)3 (1) (b) < (a) < (c) (2) (c) < (a) < (b) (3) (a) < (b) < (c) (4) (a) < (c) < (b) JEE Main 2021 (16 Mar Shift 2) JEE Main Previous Year Paper

Q42.Match List I with List II : (Both having metallurgical terms) List-I List-II Concentration of Ag (a) (i) Reverberatory furnace ore (b) Blast furnace (ii) Pig iron (c) Blister copper (iii) Leaching with dilute NaCN solution Froth floatation (d) (iv) Sulfide ores method Choose the correct answer from the options given below: (1) (a) −(iii), (b) −(ii), (c) −(i), (d) −(iv) (2) (a) −(iii), (b) −(iv), (c) −(i), (d) −(ii) (3) (a) −(iv), (b) −(i), (c) −(iii), (d) −(ii) (4) (a) −(iv), (b) −(iii), (c) −(ii), (d) −(i)

Q42. Consider the above reaction, the major product 'P' is: (1) (2) (3) (4)

Q42.The point of intersection and sudden increase in the slope, in the diagram given below, respectively, indicates: (1) ΔG = 0 and melting or boiling point of the metal (2) ΔG > 0 and decomposition of the metal oxide oxide (3) ΔG < 0 and decomposition of the metal oxide (4) ΔG = 0 and reduction of the metal oxide

Q42.Chemical nature of the nitrogen oxide compound obtained from a reaction of concentrated nitric acid and P4O10 (in 4 : 1 ratio) is: (1) acidic (2) basic (3) amphoteric (4) neutral

Q42.Identify A in the given reaction. JEE Main 2021 (26 Feb Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q42.Acidic ferric chloride solution on treatment with excess of potassium ferrocyanide gives a Prussian blue coloured colloidal species. It is: (1) HFe[Fe(CN)6] (2) K5 Fe [Fe(CN)6]2 (3) Fe4 [Fe(CN)6]3 (4) KFe[Fe(CN)6]

Q42.The addition of silica during the extraction of copper from its sulphide ore :- (1) converts copper sulphide into copper silicate (2) converts iron oxide into iron silicate (3) reduces copper sulphide into metallic copper (4) reduces the melting point of the reaction mixture

Q42.On treating a compound with warm dil. H2 SO4 , gas X is evolved which turns K2 Cr2 O7 paper acidified with dil. H2 SO4 to a green compound Y. X and Y respectively are : (1) X = SO2, Y = Cr2 O3 (2) X = SO2, Y = Cr2 (SO4)3 (3) X = SO3, Y = Cr2 (SO4)3 (4) X = SO3, Y = Cr2 O3

Q42.Which one of the following correctly represents the order of stability of oxides, X2O; ( X = halogen ) ? (1) Cl > I > Br (2) Br > Cl > I (3) I > Cl > Br (4) Br > I > Cl

Q42.Which one of the following gases is reported to retard photosynthesis? (1) CO (2) CFCs (3) CO2 (4) NO2

Q42.The charges on the colloidal CdS sol and TiO2 sol are, respectively : (1) positive and positive (2) positive and negative (3) negative and negative (4) negative and positive

Q42.The number of non-ionisable hydrogen atoms present in the final product obtained from the hydrolysis of PCl5 is : (1) 0 (2) 1 (3) 2 (4) 3

Q42.When silver nitrate solution is added to potassium iodide solution then the sol produced is: (1) AgI /I− (2) AgI / Ag+ (3) KI / NO−3 (4) AgNO3 / NO−3