Practice Questions

Q47.The electrolytes usually used in the electroplating of gold and silver, respectively, are: (1) [Au (NH3)2]+ and [Ag (CN)2]− (2) [Au (CN)2]− and [AgCl2]− (3) [Au (OH)4]− and [Ag (OH)2]− (4) [Au (CN)2]− and [Ag (CN)2]−

Q47.A gas undergoes physical adsorption on a surface and follows the given Freundlich adsorption isotherm equation x = kp0.5 m Adsorption of the gas increases with: (1) Decrease in p and increase in T (2) Increase in p and decrease in T (3) Increase in p and increase in T (4) Decrease in p and decrease in T

Q47.The correct match between Item I and Item II is: Item I Item II (A) Benzaldehyde (P) Mobile phase (B) Alumina (Q) Adsorbent (C) Acetonitrile (R) Adsorbate (1) (A) →(P); (B) →(R); (C) →(Q) (2) (A) →(R); (B) →(Q); (C) →(P) (3) (A) →(Q); (B) →(P); (C) →(R) (4) (A) →(Q); (B) →(R); (C) →(P)

Q47.Which one of the following statements regarding Henry's law is not correct? (1) Different gases have different 𝐾𝐻 (Henry's law (2) The partial pressure of the gas in vapour phase is constant) values at the same temperature proportional to the mole fraction of the gas in the solution (3) Higher the value of 𝐾𝐻 at a given pressure, (4) The value of 𝐾𝐻 increases with increase of higher is the solubility of the gas in the liquids temperature and 𝐾𝐻 is function of the nature of the gas

Q48.If a reaction follows the Arrhenius equation, the plot ln k vs (RT)1 gives straight line with a gradient (−y) unit. The energy required to activate the reactant is: (1) y/R unit (2) y unit (3) yR unit (4) −y unit

Q48.Among the following reactions of hydrogen with halogens, the one that requires a catalyst is: (1) H2 + Cl2 →2 HCl (2) H2 + I2 →2 HI (3) H2 + F2 →2 HF (4) H2 + Br2 →2 HBr

Q48.The Mond process is used for the: (1) Purification of Zr and Ti (2) Purification of Ni (3) Extraction of Zn (4) Extraction of Mo

Q48.Among the following, the false statement is: (1) Latex is a colloidal solution of rubber particles (2) Tyndall effect can be used to distinguish between which are positively charged a colloidal solution and a true solution. (3) It is possible to cause artificial rain by throwing (4) Lyophilic sols can be coagulated by adding an electrified sand carrying charge opposite to the electrolyte. one on clouds from an aeroplane.

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.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.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

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.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

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.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 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 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 element that usually does NOT show variable oxidation states is: (1) Cu (2) Ti (3) Sc (4) V

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

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 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

Q53. Mn2(CO)10 is an organometallic compound due to the presence of: (1) Mn −O bond (2) Mn −Mn bond (3) C −O bond (4) Mn −C bond

Q53.The coordination numbers of Co and Al in [Co(Cl)(en)2]Cl and K3[Al(C2O4)3], respectively are: (en = ethane-1, 2-diamine) (1) 3 and 3 (2) 5 and 3 (3) 5 and 6 (4) 6 and 6