Practice Questions

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

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

Q38.The conversion of hydroxyapatite occurs due to presence of F− ions in water. The correct formula of hydroxyapatite is: (1) [Ca3 (PO4)2 ⋅CaF2] (2) [3 Ca3 (PO4)2 ⋅Ca(OH)2] (3) [3 Ca3 (PO4)2 ⋅CaF2] (4) [3 Ca(OH)2 ⋅CaF2]

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.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)

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.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 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, percentage yield of : (1) C > A > B (2) B > C > A (3) A > C > B (4) C > B > A

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.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.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.Tyndall effect is more effectively shown by: (1) lyophilic colloid (2) suspension (3) lyophobic colloid (4) true solution

Q38.Which one of the following given graphs represents the variation of rate constant ( k ) with temperature ( T ) for an endothermic reaction? (1) (2) (3) (4)

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.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.Given below are two statements: Statement I: A mixture of chloroform and aniline can be separated by simple distillation. Statement II: When separating aniline from a mixture of aniline and water by steam distillation aniline boils below its boiling point. 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 true (2) Statement I is true but Statement II is false (3) Statement I is false but Statement II is true (4) Both Statement I and Statement II are false

Q38.Given below are two statements: Statement-I : 2 -methylbutane on oxidation with KMnO4 gives 2 -methylbutan- 2-ol. Statement-II : n -alkanes can be easily oxidised to corresponding alcohol with KMnO4 . Choose the correct option : JEE Main 2021 (17 Mar Shift 2) JEE Main Previous Year Paper (1) Both statement I and statement II are correct (2) Both statement I and statement II are incorrect (3) Statement I is correct but Statement II is (4) Statement I is incorrect but Statement II is incorrect correct

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

Q38.For the following sequence of reactions, the correct products are : JEE Main 2021 (31 Aug Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q38.Given below are two statements: Statement-I: Retardation factor (Rf) can be measured in meter/centimetre. Statement-II: Rf value of a compound remains constant in all solvents. Choose the most appropriate answer from the options given below: (1) Statement-I is true but statement-II is false (2) Both statement-I and statement-II are true (3) Both statement-I and statement-II are false (4) Statement-I is false but statement-II is true

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

Q39.Given below are two statements: Statement I: The value of the parameter "Biochemical Oxygen Demand (BOD)" is important for survival of aquatic life. Statement II: The optimum value of BOD is 6. 5 ppm. In the light of the above statements, choose the most appropriate answer from the options given below: JEE Main 2021 (24 Feb Shift 2) JEE Main Previous Year Paper (1) Statement I is true but Statement II is false (2) Statement I is false but Statement II is true (3) Both Statement I and Statement II are false (4) Both Statement I and Statement II are true