Practice Questions

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 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.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.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.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 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.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.Select the graph that correctly describes the adsorption isotherms at two temperatures T1 and T2( T 1 > T2) for a gas : ( x− mass of the gas adsorbed m − - mass of adsorbent P−pressure ) (1) (2) (3) (4)

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

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

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.Select the correct statements. (A) Crystalline solids have long range order. (B) Crystalline solids are isotropic. (C) Amorphous solid are sometimes called pseudo solids. (D) Amorphous solids soften over a range of temperatures. (E) Amorphous solids have a definite heat of fusion. Choose the most appropriate answer from the options given below. (1) (A), (B), (E) only (2) (B), (D) only (3) (C), (D) only (4) (A), (C), (D) only

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.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.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.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.

Q40.Given below are two statements: Statement I : The limiting molar conductivity of KCl (strong electrolyte) is higher compared to that of CH3COOH (weak electrolyte). Statement II : Molar conductivity decreases with decrease in concentration of electrolyte. In the light of the above statements, choose the most appropriate answer from the options given below: (1) Statement I is false but Statement II is true (2) Both Statement I and Statement II are true (3) Statement I is true but Statement II is false (4) Both Statement I and Statement II are false

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.Potassium permanganate on heating at 513 K gives a product which is : (1) paramagnetic and colourless (2) diamagnetic and colourless (3) diamagnetic and green (4) paramagnetic and green

Q40.Given below are two statements : Statement I : Chlorofluoro carbons breakdown by radiation in the visible energy region and release chlorine gas in the atmosphere which then reacts with stratospheric ozone. Statement II : Atmospheric ozone reacts with nitric oxide to give nitrogen and oxygen gases, which add to the atmosphere. For the above statements choose the correct answer from the options given below : JEE Main 2021 (25 Jul Shift 2) JEE Main Previous Year Paper (1) Statement I is incorrect but statement II is true (2) Both statement I and II are false (3) Statement I is correct but statement II is false (4) Both statement I and II are correct