Practice Questions

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

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.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.The conditions given below are in the context of observing Tyndall effect in colloidal solutions: (A) The diameter of the colloidal particles is comparable to the wavelength of light used. (B) The diameter of the colloidal particles is much smaller than the wavelength of light used. (C) The diameter of the colloidal particles is much larger than the wavelength of light used. (D) The refractive indices of the dispersed phase and the dispersion medium are comparable. (E) The dispersed phase has a very different refractive index from the dispersion medium. Choose the most appropriate conditions from the options given below: (1) (A) and (E) only (2) (C) and (D) only (3) (A) and (D) only (4) (B) and (E) only

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.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.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

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.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.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

Q40.Which of the following reduction reaction CANNOT be carried out with coke? (1) Al2 O3 →Al (2) ZnO →Zn (3) Fe2 O3 →Fe (4) Cu2 O →Cu

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.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.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.The presence of ozone in troposphere: (1) protects us from the UV radiation (2) protects us from greenhouse effect (3) protects us from the X-ray radiation (4) generates photochemical smog

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.The correct order of following 3d metal oxides, according to their oxidation numbers is : (a) CrO3 (b) Fe2O3 (c) MnO2 (d) V2O5 (e) Cu2O (1) ( d ) > ( a ) > ( b ) > ( c ) > ( e ) (2) ( a ) > ( c ) > ( d ) > ( b ) > ( e ) (3) ( a ) > ( d ) > ( c ) > ( b ) > ( e ) (4) ( c ) > ( a ) > ( d ) > ( e ) > ( b )

Q40.Which of the following ore is concentrated using group 1 cyanide salt? JEE Main 2021 (24 Feb Shift 1) JEE Main Previous Year Paper (1) Malachite (2) Calamine (3) Siderite (4) Sphalerite

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.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.The parameters of the unit cell of a substance are a = 2. 5, b = 3. 0, c = 4. 0, α = 90°, β = 120°γ = 90°. The crystal system of the substance is : (1) Hexagonal (2) Orthorhombic (3) Monoclinic (4) Triclinic

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

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.