Practice Questions

Q48.Among the colloids cheese (C), milk (M) and smoke (S), the correct combination of the dispersed phase and dispersion medium, respectively is : (1) C : liquid in solid; M : liquid in solid; S : solid in (2) C : liquid in solid; M : liquid in liquid; S : solid gas in gas (3) C : solid in liquid; M : liquid in liquid; S : gas in (4) C : solid in liquid; M : solid in liquid; S : solid in solid gas

Q49.Good reducing nature of H3PO2 is attributed to the presence of: (1) One P −H bond (2) Two P −OH bonds (3) Two P −H bond (4) One P −OH bond

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

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

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

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.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.Match the ores (column A) with the metals (column B) : (1) (I) - (a); (II) - (b); (III) - (c); (IV) - (d) (2) (I) - (c); (II) - (d); (III) - (b); (IV) - (a) (3) (I) - (c); (II) - (d); (III) - (a); (IV) - (b) (4) (I) - (b); (II) - (c); (III) - (d); (IV) - (a)

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.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.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

Q51.The ore that contains both iron and copper is: (1) Azurite (2) Malachite (3) Dolomite (4) Copper pyrites JEE Main 2019 (09 Jan Shift 1) JEE Main Previous Year Paper

Q51.Hall Heroult's process is given by: (1) Cr2O3 + 2Al →Al2O3 + Cr (2) 2Al2O3 + 3C →4Al + 3CO2 − (3) Cu2+(aq) + H2(g) →Cu(s) + 2H +(aq) (4) ZnO + C Coke,1673→ Zn + CO

Q51.The statement that is INCORRECT about the interstitial compounds is: (1) They have high melting points. (2) They are very hard. (3) They are chemically reactive. (4) They have metallic conductivity.

Q51.The coordination number of Th in K4 [Th(C2O4)4(H2O)2] is: (C2O2−4 = oxalato ) (1) 14 (2) 6 (3) 8 (4) 10

Q51.The idea of froth flotation method came from a person X and this method is related to the process Y of ores. X and Y, respectivity, are: (1) Washer man and reduction (2) Fisher women and concentration (3) Fisher man and reduction (4) Washer woman and concentration

Q51.The correct order of the oxidation states of nitrogen in NO, N2O, NO2 and N2O3 is (1) N2O < NO < N2O3 < NO2 (2) NO2 < N2O3 < NO < N2O (3) NO2 < NO < N2O3 < N2O (4) N2O < N2O3 < NO < NO2

Q52.The highest possible oxidation states of uranium and plutonium, respectively, are (1) 4 and 6 (2) 7 and 6 (3) 6 and 4 (4) 6 and 7

Q52.The metal that gives hydrogen gas upon treatment with both the acid as well as the base is (1) Zinc (2) Magnesium (3) Iron (4) Mercury JEE Main 2019 (12 Apr Shift 1) JEE Main Previous Year Paper

Q52.The effect of lanthanoid contraction in the lanthanoid series of elements by and large means (1) increase in atomic radii and decrease in ionic (2) decrease in atomic radii and increase in ionic radii, radii. (3) increase in both atomic and ionic radii. (4) decrease in both atomic and ionic radii. JEE Main 2019 (10 Jan Shift 1) JEE Main Previous Year Paper

Q52.The number of water molecules not coordinated to copper ion directly in CuSO4 ⋅5H2O, is (1) 4 (2) 2 (3) 1 (4) 3

Q52.The metal's d− orbitals that are directly facing the ligands in K3[Co(CN)6] are: (1) dxy, dxz and dyz (2) dx2−y2 and dz2 (3) dxy and dx2−y2 (4) dxz, dyz and dz2

Q52.The compound that inhibits the growth of tumors is: (1) trans - PtCl2NH32 (2) cis - PtCl2NH32 (3) cis - PdCl2NH32 (4) trans - PdCl2NH32