Practice Questions

Q39.The water having more dissolved O2 is : (1) boiling water (2) water at 80°C (3) polluted water (4) water at 4°C

Q39.Match List- I with List- II List- I List- II (a) Sodium Carbonate (i) Deacon (b) Titanium (ii) Castner-Kellner (c) Chlorine (iii) van-Arkel (d) Sodium hydroxide (iv) Solvay Choose the correct answer from the options given below: (1) (a) →(i), (b) →(iii), (c) →(iv), (d) →(ii) (2) (a) →(iii), (b) →(ii), (c) →(i), (d) →(iv) (3) (a) →(iv), (b) →(i), (c) →(ii), (d) →(iii) (4) (a) →(iv), (b) →(iii), (c) →(i), (d) →(ii) JEE Main 2021 (26 Feb Shift 2) JEE Main Previous Year Paper

Q39.The chemical that is added to reduce the melting point of the reaction mixture during the extraction of aluminium is: (1) Cryolite (2) Bauxite (3) Calamine (4) Kaolite

Q39.In Carius method, halogen containing organic compound is heated with fuming nitric acid in the presence of: (1) HNO3 (2) AgNO3 (3) CuSO4 (4) BaSO4

Q39.The INCORRECT statements below regarding colloidal solutions is : (1) A colloidal solution shows colligative properties. (2) An ordinary filter paper can stop the flow of colloidal particles. (3) The flocculation power of Al3+ is more than that (4) A colloidal solution shows Brownian motion of of Na+ colloidal particles.

Q39.Which of the following is a FALSE statement? (1) Carius tube is used in the estimation of sulphur in (2) Phosphoric acid produced on oxidation of an organic compound. phosphorus present in an organic compound is precipitated as Mg2 P2O7 by adding magnesia mixture. (3) Carius method is used for the estimation of (4) Kjeldahl's method is used for the estimation of nitrogen in an organic compound. nitrogen in an organic compound.

Q39.In Freundlich adsorption isotherm, slope of AB line is: 1 1 (1) with = 0 to 1 (2) n with n = 0 . 1 to 0 . 5 n n (3) log1 with n < 1 (4) logn with n > 1 n

Q39.In the leaching of alumina from bauxite, the ore expected to leach out in the process by reacting with NaOH is : (1) TiO2 (2) Fe2O3 (3) ZnO (4) SiO2

Q39.Which one of the following statements is NOT correct? (1) Eutrophication indicates that water body is (2) The dissolved oxygen concentration below polluted 6 ppm inhibits fish growth (3) Eutrophication leads to increase in the oxygen (4) Eutrophication leads to anaerobic conditions level in water

Q39.Which among the following is the strongest acid? (1) CH3 CH2 CH2 CH3 (2) (3) (4)

Q39.Which one of the following is formed (mainly) when red phosphorus is heated in a sealed tube at 803 K? (1) α-Black phosphorus (2) White phosphorus (3) Yellow phosphorus (4) β-Black phosphorus

Q40.Most suitable salt which can be used for efficient clotting of blood will be? (1) FeCl3 (2) Mg (HCO3)2 (3) FeSO4 (4) NaHCO3

Q40.The oxide that shows magnetic property is: (1) SiO2 (2) Mn3 O4 (3) Na2 O (4) MgO

Q40.Match List - I with List - II: List-I (Species) List-II (Number of lone pairs of electrons on the central atom) (a) XeF2 (i) 0 (b) XeO2 F2 (ii) 1 (c) XeO3 F2 (iii) 2 (d) XeF4 (iv) 3 Choose the most appropriate answer from the options given below: (1) (a) −(iii), (b) −(iv), (c) −(ii), (d) −(i) (2) (a) −(iv), (b) −(i), (c) −(ii), (d) −(iii) (3) (a) −(iii), (b) −(ii), (c) −(iv), (d) −(i) (4) (a) −(iv), (b) −(ii), (c) −(i), (d) −(iii)

Q40.Match List - I with List - II : List - I List - II (Unit) (Parameter) (a) Cell constant (i) S cm2 mol-1 (b) Molar conductivity (ii) Dimensionless (c) Conductivity (iii) m-1 (d) Degree of dissociation of electrolyte (iv) Ω-1 m-1 (1) (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii) (2) (a)-(iii), (b)-(i), (c)-(ii), (d)-(iv) (3) (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii) (4) (a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)

Q40.Identify A and B in the chemical reaction. (1) (2) (3) (4)

Q40.The sol given below with negatively charged colloidal particles is: (1) AgNO3 added to KI solution (2) KI added to AgNO3 solution (3) Al2 O3 ⋅xH2O in water (4) FeCl3 added to hot water

Q40.Which one of the following statements is FALSE for hydrophilic sols? (1) These sols are reversible in nature. (2) Their viscosity is of the order of that of H2O . (3) The sols cannot be easily coagulated. (4) They do not require electrolytes for stability.

Q40.Given below are two statements : Statement I : The E° value of Ce4+ / Ce3+ is +1. 74 V JEE Main 2021 (16 Mar Shift 1) JEE Main Previous Year Paper Statement II : Ce is more stable in Ce4+ state than Ce3+ state. In the light of the above statements, choose the most appropriate answer from the options given below: (1) Both statement I and statement II are correct (2) Statement I is incorrect but statement II is correct (3) Both statement I and statement II are incorrect (4) Statement I is correct but statement II is incorrect

Q40.Which one of the following 0. 06 M aqueous solutions has lowest freezing point ? (1) Al2 (SO4)3 (2) C6H12O6 (3) KI (4) K2 SO4

Q40.Which of the following statement(s) is (are) incorrect reason for eutrophication? (A) excess usage of fertilisers (B) excess usage of detergents (C) dense plant population in water bodies (D) lack of nutrients in water bodies that prevent plant growth Choose the most appropriate answer from the options given below : (1) (A) only (2) (C) only (3) (B) and (D) only (4) (D) only

Q40.Match List- I with List- II. List- I List- II (a) Siderite (i) Cu (b) Calamine (ii) Ca (c) Malachite (iii) Fe (d) Cryolite (iv) Al (v) Zn Choose the correct answer from the options given below: (1) (a) →(iii), (b) →(i), (c) →(v), (d) →(ii) (2) (a) →(i), (b) →(ii), (c) →(v), (d) →(iii) (3) (a) →(iii), (b) →(v), (c) →(i), (d) →(iv) (4) (a) →(i), (b) →(ii), (c) →(iii), (d) →(iv)

Q40.Calamine and Malachite, respectively, are the ores of : (1) Copper and Iron (2) Zinc and Copper (3) Aluminium and Zinc (4) Nickel and Aluminium

Q40.The number of ionisable hydrogens present in the product obtained from a reaction of phosphorus trichloride and phosphonic acid is: (1) 3 (2) 0 (3) 2 (4) 1

Q40.Benzene on nitration gives nitrobenzene in presence of HNO3 and H2 SO4 mixture, where: (1) both H2 SO4 and HNO3 act as a bases (2) HNO3 acts as an acid and H2 SO4 acts as a base (3) both H2 SO4 and HNO3 act as an acids (4) HNO3 acts as a base and H2 SO4 acts as an acid