Practice Questions

Q41.Which one of the following is correct for the adsorption of a gas at a given temperature on a solid surface? (1) ΔH > 0, ΔS > 0 (2) ΔH < 0, ΔS > 0 (3) ΔH > 0, ΔS < 0 (4) ΔH < 0, ΔS < 0 JEE Main 2021 (26 Aug Shift 1) JEE Main Previous Year Paper

Q41.Match List - I with List - II. List-I (Metal) List-II (Ores) (a) Aluminium (i) Siderite (b) Iron (ii) Calamine (c) Copper (iii) Kaolinite (d) Zinc (iv) Malachite Choose the correct answer from the options given below: (1) (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii) (2) (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i) (3) (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv) (4) (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)

Q41.Match List- I with List- II. List- I List- II (a) (i) Wurtz reaction (b) (ii) Sandmeyer reaction Ether −(c) 2 CH3 CH2 Cl + 2Na → C2H5 −C2H5 + 2 NaCl (iii) Fittig reaction Ether −(d) 2C6H5Cl + 2Na → C6H5 −C6H5 + 2 NaCl (iv) Gatterman reaction Choose the correct answer from the options given below: (1) (a) →(iii), (b) →(iv), (c) →(i), (d) →(ii) (2) (a) →(ii), (b) →(i), (c) →(iv), (d) →(iii) (3) (a) →(iii), (b) →(i), (c) →(iv), (d) →(ii) (4) (a) →(ii), (b) →(iv), (c) →(i), (d) →(iii)

Q41.The metal that can be purified economically by fractional distillation method is: (1) Fe (2) Zn (3) Cu (4) Ni

Q41.Match List I with List II : List-I List-II Example of colloids Classification (a) Cheese (i) dispersion of liquid in liquid (b) Pumice stone (ii) dispersion of liquid in gas (c) Hair cream (iii) dispersion of gas in solid (d) Cloud (iv) dispersion of liquid in solid Choose the most appropriate answer from the options given below (1) (a) −(iv), (b) −(iii), (c) −(ii), (d) −(i) (2) (a) −(iv), (b) −(i), (c) −(iii), (d) −(ii) (3) (a) −(iii), (b) −(iv), (c) −(i), (d) −(ii) (4) (a) −(iv), (b) −(iii), (c) −(i), (d) −(ii)

Q41.In the structure of the dichromate ion, there is a : (1) linear symmetrical Cr −O −Cr bond. (2) non-linear unsymmetrical Cr −O −Cr bond. (3) non-linear symmetrical Cr −O −Cr bond. (4) linear unsymmetrical Cr −O −Cr bond.

Q41.Match List −I with List −II List −I (process) List −II (catalyst) (a) Deacon's process (i) ZSM −5 (b) Contact process (ii) CuCl2 (c) Cracking of hydrocarbons (iii) Ni (d) Hydrogenation of vegetable oils (iv) V2O5 Choose the most appropriate answer from the options given below- (1) a −ii, b −iv, c −i, d −iii (2) a −i, b −ii, c −ii, d −iv (3) a −iii, b −i, c −iv, d −ii (4) a −iv, b −ii, c −i, d −iii

Q41.The method used for the purification of Indium is: (1) vapour phase refining (2) liquation (3) zone refining (4) van Arkel method

Q41.A colloidal system consisting of a gas dispersed in a solid is called a/an: (1) solid sol (2) gel (3) aerosol (4) foam

Q41.The process that involves the removal of sulphur from the ores is : (1) Smelting (2) Roasting (3) Leaching (4) Refining

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.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.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)

Q43.The set that represents the pair of neutral oxides of nitrogen is: (1) NO and N2O (2) N2O and N2O3 (3) N2O and NO2 (4) NO and NO2 JEE Main 2021 (17 Mar Shift 2) JEE Main Previous Year Paper

Q43. Identify the reagent(s) ' A ' and condition(s) for the reaction : (1) A = HCl; Anhydrous AlCl3 (2) A = HCl, ZnCl2 (3) A = Cl2 ; UV light (4) A = Cl2 ; dark, Anhydrous AlCl3

Q43.The denticity of an organic ligand, biuret is : (1) 2 (2) 3 (3) 4 (4) 6 JEE Main 2021 (31 Aug Shift 1) JEE Main Previous Year Paper

Q43.Chalcogen group elements are : (1) Se, Te and Po. (2) O, Ti and Po. (3) Se, Tb and Pu . (4) S, Te and Pm .

Q43.Identify the element for which electronic configuration in +3 oxidation state is [Ar]3 d5: (1) Ru (2) Mn (3) Co (4) Fe

Q44.The common positive oxidation states for an element with atomic number 24, are: (1) +2 to +6 (2) +1 and +3 to +6 (3) +1 and +3 (4) +1 to +6

Q44. In the above reaction, the reagent " A " is : (1) NaBH4, H3O+ (2) LiAlH4 (3) Alkaline KMnO4, H+ (4) HCl, Zn −Hg

Q44.Which one of the following group- 15 hydride is the strongest reducing agent ? (1) AsH3 (2) BiH3 (3) PH3 (4) SbH3

Q44.What is the spin-only magnetic moment value (B.M.) of a divalent metal ion with atomic number 25, in its aqueous solution? JEE Main 2021 (17 Mar Shift 1) JEE Main Previous Year Paper (1) 5. 92 (2) 5. 0 (3) zero (4) 5. 26

Q44.The major components of German Silver are : (1) Zn, Ni and Ag (2) Cu, Zn and Ni (3) Ge, Cu and Ag (4) Cu, Zn and Ag

Q45.Identify A in the given chemical reaction. JEE Main 2021 (26 Feb Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)