Practice Questions

Q41.The major components in "Gun Metal" are: (1) Cu, Sn and Zn (2) Al, Cu, Mg and Mn (3) Cu, Ni and Fe (4) Cu, Zn and Ni

Q41.Isotope(s) of hydrogen which emits low energy β− particles with t1/2 value > 12 years is/are (1) Protium (2) Tritium (3) Deuterium (4) Deuterium and Tritium

Q41.Match List- I with List- II. List- I List- II (Ore) (Element Present) (a) Kernite (p) Tin (b) Cassiterite (q) Boron (c) Calamine (r) Fluorine (d) Cryolite (s) Zinc Choose the most appropriate answer from the options given below: (1) (a) →(r), (b) →(p), (c) →(q), (d) →(s) (2) (a) →(q), (b) →(s), (c) →(p), (d) →(r) (3) (a) →(p), (b) →(r), (c) →(s), (d) →(q) (4) (a) →(q), (b) →(p), (c) →(s), (d) →(r)

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.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.For the coagulation of a negative sol, the species below, that has the highest flocculating power is: (1) SO2−4 (2) Ba2+ (3) Na+ (4) PO3−4

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

Q41.A hard substance melts at high temperature and is an insulator in both solid and in molten state. This solid is most likely to be a / an : (1) Ionic solid (2) Molecular solid (3) Metallic solid (4) Covalent solid

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

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

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

Q41.Given below are two statements: Statement I : Sphalerite is a sulphide ore of zinc and copper glance is a sulphide ore of copper. Statement II : It is possible to separate two sulphide ores by adjusting proportion of oil to water or by using 'depressants' in a froth flotation method. Choose the most appropriate answer from the options given below : (1) Statement I is true but Statement II is false. (2) Both Statement I and Statement II are true. (3) Both Statement I and Statement II are false. (4) Statement I is false but Statement II is true.

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

Q42.The statement that is INCORRECT about Ellingham diagram is (1) provides idea about the reaction rate. (2) provides idea about free energy change. (3) provides idea about changes in the phases during (4) provides idea about reduction of metal oxide. the reaction.

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

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

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.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

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.Given below are two statements: Statement I : α and β forms of sulphur can change reversibly between themselves with slow heating or slow cooling. Statement II : At room temperature the stable crystalline form of sulphur is monoclinic sulphur. In the light of the above statements, choose the correct answer from the options given below: (1) Both Statement I and Statement II are true. (2) Statement I is true but Statement II is false. (3) Statement I is false but Statement II is true. (4) Both Statement I and Statement II are false.