Practice Questions

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.Given below are two statements: Statement I : Frenkel defects are vacancy as well as interstitial defects. Statement II : Frenkel defect leads to colour in ionic solids due to presence of F-centres. Choose the most appropriate answer for the statements from the options given below: (1) Statement I is false but Statement II is true (2) Both Statement I and Statement II are false (3) Statement I is true but Statement II is false (4) Both Statement I and Statement II are true

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 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

Q39.Given below are two statements: Statement I: The pH of rain water is normally ~5. 6. Statement II : If the pH of rain water drops below 5. 6 , it is called acid rain. In the light of the above statements, choose the correct answer from the options given below: (1) Both Statement I and Statement II are true. (2) Statement I is false but Statement II is true. (3) Statement I is true but Statement II is false. (4) Both Statement I and Statement II are false.

Q39.Which of the following reaction/s will not give p -aminoazobenzene? JEE Main 2021 (25 Feb Shift 1) JEE Main Previous Year Paper (1) B only (2) A only (3) C only (4) A and B

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

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

Q39.Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R. JEE Main 2021 (20 Jul Shift 1) JEE Main Previous Year Paper Assertion A : Sharp glass edge becomes smooth on heating it up to its melting point. Reason R : The viscosity of glass decreases on melting. Choose the most appropriate answer from the options given below. (1) A is true but R is false (2) Both A and R are true but R is NOT the correct explanation of A. (3) A is false but R is true. (4) Both A and R are true and R is the correct explanation of A .

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

Q39.Match List - I with List - II . List-I (Colloid List-II Preparation (Chemical Reaction) Method) ( a ) Hydrolysis ( i ) 2AuCl3 + 3HCHO + 3H2O →2Au ( sol ) + 3HCOOH + 6HCl ( b ) Reduction ( ii ) As2O3 + 3H2 S →As2 S3 ( sol ) + 3H2O ( c ) Oxidation ( iii ) SO2 + 2H2 S →3 S ( sol ) + 2H2O Double ( d ) ( iv ) FeCl3 + 3H2O →Fe ( OH ) ( sol ) + 3HCl Decomposition 3 Choose the most appropriate answer from the options given below : (1) ( a ) - ( i ) , ( b ) - ( iii ) , ( c ) - ( ii ) , ( d ) - ( iv ) (2) ( a ) - ( iv ) , ( b ) - ( i ) , ( c ) - ( iii ) , ( d ) - ( ii ) (3) ( a ) - ( i ) , ( b ) - ( ii ) , ( c ) - ( iv ) , ( d ) - ( iii ) (4) ( a ) - ( iv ) , ( b ) - ( ii ) , ( c ) - ( iii ) , ( 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.Given below are two statements : Statement I : Non-biodegradable wastes are generated by the thermal power plants. Statement II : Bio-degradable detergents leads to eutrophication. In the light of the above statements, choose the most appropriate answer from the option given below: (1) Both statement I and statement II are false (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 true.

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 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 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.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 type of pollution that gets increased during the daytime and in the presence of O3 is : (1) Reducing smog (2) Oxidising smog (3) Global warming (4) Acid rain

Q39.Choose the correct statement regarding the formation of carbocations A and B given :- (1) Carbocation B is more stable and formed relatively at faster rate (2) Carbocation A is more stable and formed relatively at slow rate (3) Carbocation B is more stable and formed relatively at slow rate (4) Carbocation A is more stable and formed relatively at faster rate

Q39.Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R) Assertion (A) : Photochemical smog causes cracking of rubber. Reason (R): Presence of ozone, nitric oxide, acrolein, formaldehyde and peroxyacetyl nitrate in photochemical smog makes it oxidizing. Choose the most appropriate answer from the options given below : (1) (A) is false but (R) is true. (2) Both (A) and (R) are true but (R) is not the true explanation of (A) . (3) Both (A) and (R) are true and (R) is the true explanation of (A) . (4) (A) is true but (R) is false.

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.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.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

Q40.Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Treatment of bromine water with propene yields 1-bromopropan-2-ol. Reason (R) : Attack of water on bromonium ion follows Markovnikov rule and results in 1-bromopropan-2-ol. In the light of the above statements, choose the most appropriate answer from the options given below : (1) Both (A) and (R) are true but (R) is NOT the correct explanation of (A). (2) (A) is false but (R) is true. (3) Both (A) and (R) are true and (R) is the correct explanation of (A ). (4) (A) is true but (R) is false.