Practice Questions

Q38. In the chemical reactions given above A and B respectively are : (1) H3 PO2 and CH3 CH2 Cl (2) CH3 CH2 OH and H3 PO2 (3) H3 PO2 and CH3 CH2 OH (4) CH3 CH2 Cl and H3 PO2

Q38.Which one of the following 0. 10 M aqueous solutions will exhibit the largest freezing point depression? (1) glycine (2) hydrazine (3) KHSO4 (4) glucose

Q38.The correct order of the following compounds showing increasing tendency towards nucleophilic substitution reaction is: (1) (iv) < (i) < (ii) < (iii) (2) (i) < (ii) < (iii) < (iv) (3) (iv) < (i) < (iii) < (ii) (4) (iv) < (iii) < (ii) < (i)

Q38. Consider the given reaction, Identify ′X′ and ′Y′ : (1) (2) (3) (4) JEE Main 2021 (26 Aug Shift 2) JEE Main Previous Year Paper

Q38.In a binary compound, atoms of element A form a hcp structure and those of element M occupy 2/3 of the tetrahedral voids of the hcp structure. The formula of the binary compound is: (1) M2 A3 (2) M4 A3 (3) M4 A (4) MA3 JEE Main 2021 (18 Mar Shift 1) JEE Main Previous Year Paper

Q38.The nature of charge on resulting colloidal particles when FeCl3 is added to excess of hot water is: (1) positive (2) sometimes positive and sometimes negative (3) neutral (4) negative

Q38.Identify A in the given chemical reaction. (1) (2) (3) (4)

Q38.The gas released during anaerobic degradation of vegetation may lead to: (1) Corrosion of metals (2) Ozone hole (3) Global warming and cancer (4) Acid rain

Q38.Which one of the following pairs of isomers is an example of metamerism? (1) (2) (3) (4)

Q38. The product " A " and " B " formed in above reactions are (1) (2) (3) (4)

Q38.Green chemistry in day-to-day life is in the use of: (1) Chlorine for bleaching of paper (2) Large amount of water alone for washing clothes (3) Tetrachloroethene for laundry (4) Liquified CO2 for dry cleaning of clothes

Q38.Presence of which reagent will affect the reversibility of the following reaction, and change it to a irreversible reaction : hv CH4 + I2 ⇌ CH3 −I + HI Reversible (1) HOCl (2) dilute HNO2 (3) Liquid NH3 (4) Concentrated HIO3

Q38.The correct decreasing order of densities of the following compounds is : (1) (D) > (C) > (B) > (A) (2) (C) > (D) > (A) > (B) (3) (C) > (B) > (A) > (D) (4) (A) > (B) > (C) > (D)

Q38.The green house gas/es is (are): (A) Carbon dioxide (B) Oxygen (C) Water vapour (D) Methane Choose the most appropriate answer from the options given below: (1) (A) and (C) only (2) (A) only (3) (A), (C) and (D) only (4) (A) and (B) only

Q38.The correct sequence of correct reagents for the following transformation is :- (1) (i) Fe, HCl (2) (i) Fe, HCl (ii) Cl2, HCl, (ii) NaNO2, HCl, 0°C (iii) NaNO2, HCl, 0°C (iii) H2O/H+ (iv) H2O/H+ (iv) Cl2, FeCl3 (3) (i) Cl2, FeCl3 (4) (i) Cl2, FeCl3 (ii) Fe, HCl (ii) NaNO2, HCl, 0°C (iii) NaNO2, HCl, 0°C (iii) Fe, HCl (iv) H2O/H+ (iv) H2O/H+

Q38. Consider the given reaction, percentage yield of : (1) C > A > B (2) B > C > A (3) A > C > B (4) C > B > A

Q38.The correct sequence of reagents used in the preparation of 4 -bromo- 2-nitroethylbenzene from benzene is : JEE Main 2021 (25 Feb Shift 2) JEE Main Previous Year Paper (1) CH3 COCl / AlCl3, Br2 / AlBr3, HNO3 /H2 SO4, Zn / HCl (2) CH3 COCl / AlCl3, Zn −Hg / HCl, Br2 / AlBr3, HNO3 /H2 SO4 (3) HNO3 /H2 SO4, Br2 / AlCl3, CH3 COCl / AlCl3, Zn −Hg / HCl (4) Br2 / AlBr3, CH3 COCl / AlCl3, HNO3 /H2 SO4, Zn / HCl

Q38.Match List-I with List-II : List-I List-I (Name of ore/mineral) (Chemical formula) a Calamine i ZnS b Malachite ii FeCO3 c Siderite iii ZnCO3 d Sphalerite iv CuCO3 ⋅Cu(OH)2 JEE Main 2021 (27 Aug Shift 2) JEE Main Previous Year Paper Choose the most appropriate answer from the options given below : (1) (a) − (iv), (b) − (iii), (c) − (i), (d) − (ii) (2) (a) − (iii), (b) − (ii), (c) − (iv), (d) − (i) (3) (a ) -( iii ),( b )-( iv ),( c )-( i ),( d )-( ii) (4) (a ) -( iii ), ( b ) -( iv ),( c )-( ii ),( d )-( i)

Q39.The deposition of X and Y on ground surfaces is referred as wet and dry depositions, respectively. X and Y are : (1) X = CO2 , Y = SO2 (2) X = Ammonium salts Y = SO2 (3) X = Ammonium saltsY = CO2 (4) X = SO2 Y = Ammonium salts

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.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 - II List - I (compound) (effect/affected species) a Carbon monoxide i Carcinogenic b Sulphur dioxide ii Metabolized by pyrus plants c Polychlorinated biphenyls iii Haemoglobin d Oxides of Nitrogen iv Stiffness of flower buds Choose the correct answer from the options given below: (1) (a ) - ( iii ), ( b ) - ( iv ), ( c ) - ( i ), ( d ) - ( ii) (2) (a) − (iv), (b) − (i), (c) − (iii), (d) − (ii) (3) (a) − (i), (b) − (ii), (c) − (iii), (d) − (iv) (4) (a) − (iii), (b) − (iv), (c) − (ii), (d) − (i)

Q39.Which refining process is generally used in the purification of low melting metals? (1) Chromatographic method (2) Electrolysis (3) Zone refining (4) Liquation

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.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