Practice Questions

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.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.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.Which one of the following is used to remove most of plutonium from spent nuclear fuel? (1) BrO3 (2) I2O5 (3) ClF3 (4) O2F2

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.The oxide without nitrogen-nitrogen bond is : JEE Main 2021 (01 Sep Shift 2) JEE Main Previous Year Paper (1) N2O4 (2) N2O (3) N2O5 (4) N2O3

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.Which one of the following species responds to an external magnetic field? (1) FeH2O6 3 + (2) NiCN4 2 - (3) CoCN6 3 - (4) NiCO4

Q41.Given below are two statements: JEE Main 2021 (25 Feb Shift 1) JEE Main Previous Year Paper Statement I : An allotrope of oxygen is an important intermediate in the formation of reducing smog. Statement II : Gases such as oxides of nitrogen and sulphur present in troposphere contribute to the formation of photochemical smog. In the light of the above statements, choose the correct answer from the options given below: (1) Both Statement I and Statement II are false (2) Both Statement I and Statement II are true (3) Statement I is true but Statement II is false (4) Statement I is false but Statement II is true

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.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.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.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 (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 nature of oxides V2O3 and CrO is indexed as ′X′ and ′Y′ type respectively. The correct set of X and Y is: (1) X =acidic Y =acidic (2) X =basic Y =amphoteric (3) X =basic Y =basic (4) X =amphoteric Y =basic JEE Main 2021 (27 Aug Shift 1) JEE Main Previous Year Paper

Q41. Fex2 and Fey3 are known when x and y are : (1) x = F, Cl, Br, I and y = F, Cl, Br (2) x = F, Cl, Br and y = F, Cl, Br, I (3) x = Cl, Br, I and y = F, Cl, Br, I (4) x = F, Cl, Br, I and y = F, Cl, Br, I

Q41.Given below are two statement : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : SO2( g) is adsorbed to a large extent than H2( g) on activated charcoal. Reason R : SO2( g) has a higher critical temperature than H2( g) In the light of the above statements, choose the most appropriate answer from the options given below. JEE Main 2021 (27 Jul Shift 2) JEE Main Previous Year Paper (1) Both A and R are correct but R is not the (2) Both A and R are correct and R is the correct correct explanation fo A explanation of A . (3) A is not correct but R is correct. (4) A is correct but R is not correct.

Q41.The number of S = O bonds present in sulphurous acid, peroxodisulphuric acid and pyrosulphuric acid, respectively are : (1) 1, 4 and 3 (2) 1, 4 and 4 (3) 2, 3 and 4 (4) 2, 4 and 3

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.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. Major product P of above reaction, is: (1) (2) (3) (4)

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

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