Practice Questions

Q49.Consider the given plots for a reaction obeying Arrhenius equation (0°C < T < 300°C) : ( K and Ea are rate constant and activetion energy, respectively ) (I) (II) (1) I is wrong but II is right (2) Both I and II are wrong (3) I is right but II is wrong (4) Both I and II are correct

Q49.For the reaction of H2 with I2, the rate constant is 2.5 × 10-4 dm3mol-1s-1 at 327oC and 1.0 dm3 mol-1s-1 at 527°C . The activation energy for the reaction, in kJ mol-1 is: R = 8.314 JK-1mol-1 (1) 166 (2) 59 (3) 72 (4) 150

Q49.The pair that does not require calcination is (1) ZnO and Fe2 O3. xH2 O (2) ZnO and MgO (3) ZnCO3 and CaO (4) Fe2 O3 and CaCO3. MgCO3

Q49.The pair that contains two P −H bonds in each of the oxoacids is: (1) H3 PO3 and H3 PO2 (2) H4P2O5 and H3 PO3 (3) H4P2O5 and H4P2O6 (4) H3 PO2 and H4P2O5

Q49.An example of solid sol is: (1) Paint (2) Gem stones (3) Butter (4) Hair cream

Q49.Among the following, the incorrect statement about colloids is: (1) They are larger than small molecules and have (2) They can scatter lighht. high molar mass. (3) The osmotic pressure of a collodial solution is of (4) The range of diameters of colloidal particles is higher order than the true solution at the same between 1 and 1000 nm. concentration.

Q49.In the Hall-Heroult process, aluminium is formed at the cathode. The cathode is made out of: JEE Main 2019 (12 Jan Shift 1) JEE Main Previous Year Paper (1) Platinum (2) Carbon (3) Copper (4) Pure aluminium

Q49.The oxoacid of sulphur that does not contain bond between sulphur atom is: (1) H2S2O7 (2) H2S2O4 (3) H2S4O6 (4) H2S2O3

Q49.The reaction that does NOT define calcination is: (1) Δ (2) Δ Fe2O3 ⋅xH2O ⟶Fe2O3 + xH2O 2Cu2 S + 3O2 ⟶2Cu2O + 2SO2 (3) ZnCO3 ⟶ZnOΔ + CO2 (4) CaCO3 ⋅MgCO3 ⟶CaOΔ + MgO + 2CO2 4KOH,O2

Q49.The maximum possible denticities of a ligand given below towards a common transition and inner-transition metal ion, respectively, are: (1) 8 and 6 (2) 6 and 6 (3) 8 and 8 (4) 6 and 8 JEE Main 2019 (09 Apr Shift 2) JEE Main Previous Year Paper

Q49.The ore that contains the metal in the form of fluoride is known as which of the following? (1) cryolite (2) magnetite (3) malachite (4) sphalerite JEE Main 2019 (09 Apr Shift 1) JEE Main Previous Year Paper

Q50. A ⟶ 2 B + 2H2O B ⟶4HCl 2C + MnO2 + 2H2O 2C H2O,KI⟶2 A + KOH + D In the above (Green) ( Purple ) sequence of reactions, A and D, respectively, are: (1) KI and KMnO4 (2) MnO2 and KIO3 (3) KIO3 and MnO2 (4) KI and K2MnO4

Q50.Match the catalysts (Column I) with products (Column II) Column I Column II Catalyst Product A. V2O5 P. Polyethylene B. TiCl4/Al(Me)3 Q. Ethanal C. PdCl2 R. H2SO4 D. Iron Oxide S. NH3 (1) (A) −(S); (B) −(R); (C) −(Q); (D) −(P) (2) (A) −(R); (B) −(S); (C) −(P); (D) −(Q) (3) (A) −(Q); (B) −(R); (C) −(P); (D) −(S) (4) (A) −(R); (B) −(P); (C) −(Q); (D) −(S)

Q50.Sodium metal on dissolution in liquid ammonia gives a deep blue solution due to the formation of: (1) Sodamide (2) Sodium-ammonia complex (3) Sodium ion-ammonia complex (4) Ammoniated electrons

Q50.Adsorption of a gas follows Freundlich adsorption isotherm. In the given plot, 𝑥 is the mass of the gas x adsorbed on mass m of the adsorbent at pressure P . is proportional to: m 1 (1) 4 (2) 𝑝 𝑝 (3) 𝑝2 (4) 𝑝 12

Q50.The correct statement about ICl5 and ICl4- is: (1) ICl5 is trigonal bipyramidal and ICl4- is (2) Both are isostructural. tetrahedral. (3) ICl5 is square pyramidal and ICl4- is tetrahedral. (4) ICl5 is square pyramidal and ICl4- is square planar.

Q50.The correct statement is: (1) Pig iron is obtained from cast iron. (2) The Hall-Heroult process is used for the production of aluminium and iron. (3) leaching of bauxite using concentrated NaOH (4) the blistered appearance of copper during the solution gives sodium aluminate and sodium metallurgical process is due to the evolution of silicate. CO2.

Q50.Chlorine on reaction with hot and concentrated sodium hydroxide gives. (1) Cl− and ClO−2 (2) Cl− and ClO−3 (3) Cl− and ClO− (4) ClO−3 and ClO−2

Q50.The transition elements that has the lowest enthalpy of atomisation is: (1) V (2) Fe (3) Zn (4) Cu

Q50.The correct option among the following is. (1) Brownian motion in colloidal solution is faster if (2) Colloidal particles in lyophobic sols can be the viscosity of the solution is very high. precipitated by electrophoresis. (3) Colloidal medicines are more effective because (4) Addition of alum to water makes it unfit for they have small surface area. drinking.

Q50.Which of the following is not an example of heterogeneous catalysis reaction? (1) Combustion of Coal (2) Hydrogenation of Vegetable oils (3) Ostwald's process (4) Haber's process

Q50.Iodine reacts with concentrated HNO3 to yield Y along with other products. The oxidation state of iodine in Y , is: (1) 1 (2) 5 (3) 3 (4) 7

Q50.Which respect to an ore, Ellingham diagram helps to predict the feasibility of its (1) Electrolysis (2) Zone refining (3) Vapour phase refining (4) Thermal reduction

Q50.Peptization is a: (1) Process of converting a colloidal solution into (2) Process of converting soluble particles to form precipitate colloidal solution (3) Process of bringing colloidal molecule into (4) Process of converting precipitate into colloidal solution solution

Q50.The correct statements among I to III are: (I) Valence bond theory cannot explain the color exhibited by transition metal complexes. (II) Valence bond theory can predict quantitatively the magnetic properties of transition metal complexes. (III) Valence bond theory cannot distinguish ligands as weak and strong field ones. (1) (I) and (II) only (2) (II) and (III) only (3) (I) and (III) only (4) (I), (II) and (III)