Practice Questions

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

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

Q41. Fex2 and Fey3 are known when x and y are : (1) x = F, Cl, Br, I and y = F, Cl, Br (2) x = F, Cl, Br and y = F, Cl, Br, I (3) x = Cl, Br, I and y = F, Cl, Br, I (4) x = F, Cl, Br, I and y = F, Cl, Br, I

Q41.The nature of oxides V2O3 and CrO is indexed as ′X′ and ′Y′ type respectively. The correct set of X and Y is: (1) X =acidic Y =acidic (2) X =basic Y =amphoteric (3) X =basic Y =basic (4) X =amphoteric Y =basic JEE Main 2021 (27 Aug Shift 1) JEE Main Previous Year Paper

Q41.Given below are two statement : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : SO2( g) is adsorbed to a large extent than H2( g) on activated charcoal. Reason R : SO2( g) has a higher critical temperature than H2( g) In the light of the above statements, choose the most appropriate answer from the options given below. JEE Main 2021 (27 Jul Shift 2) JEE Main Previous Year Paper (1) Both A and R are correct but R is not the (2) Both A and R are correct and R is the correct correct explanation fo A explanation of A . (3) A is not correct but R is correct. (4) A is correct but R is not correct.

Q41.The number of S = O bonds present in sulphurous acid, peroxodisulphuric acid and pyrosulphuric acid, respectively are : (1) 1, 4 and 3 (2) 1, 4 and 4 (3) 2, 3 and 4 (4) 2, 4 and 3

Q41.The oxide without nitrogen-nitrogen bond is : JEE Main 2021 (01 Sep Shift 2) JEE Main Previous Year Paper (1) N2O4 (2) N2O (3) N2O5 (4) N2O3

Q41.Given below are two statements: JEE Main 2021 (25 Feb Shift 1) JEE Main Previous Year Paper Statement I : An allotrope of oxygen is an important intermediate in the formation of reducing smog. Statement II : Gases such as oxides of nitrogen and sulphur present in troposphere contribute to the formation of photochemical smog. In the light of the above statements, choose the correct answer from the options given below: (1) Both Statement I and Statement II are false (2) Both Statement I and Statement II are true (3) Statement I is true but Statement II is false (4) Statement I is false but Statement II is true

Q41.Which one of the following is used to remove most of plutonium from spent nuclear fuel? (1) BrO3 (2) I2O5 (3) ClF3 (4) O2F2

Q41.Which one of the following species responds to an external magnetic field? (1) FeH2O6 3 + (2) NiCN4 2 - (3) CoCN6 3 - (4) NiCO4

Q41. Major product P of above reaction, is: (1) (2) (3) (4)

Q42.Identify A in the given reaction. JEE Main 2021 (26 Feb Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q42.Acidic ferric chloride solution on treatment with excess of potassium ferrocyanide gives a Prussian blue coloured colloidal species. It is: (1) HFe[Fe(CN)6] (2) K5 Fe [Fe(CN)6]2 (3) Fe4 [Fe(CN)6]3 (4) KFe[Fe(CN)6]

Q42.Which one of the following correctly represents the order of stability of oxides, X2O; ( X = halogen ) ? (1) Cl > I > Br (2) Br > Cl > I (3) I > Cl > Br (4) Br > I > Cl

Q42.When silver nitrate solution is added to potassium iodide solution then the sol produced is: (1) AgI /I− (2) AgI / Ag+ (3) KI / NO−3 (4) AgNO3 / NO−3

Q42.On treating a compound with warm dil. H2 SO4 , gas X is evolved which turns K2 Cr2 O7 paper acidified with dil. H2 SO4 to a green compound Y. X and Y respectively are : (1) X = SO2, Y = Cr2 O3 (2) X = SO2, Y = Cr2 (SO4)3 (3) X = SO3, Y = Cr2 (SO4)3 (4) X = SO3, Y = Cr2 O3

Q42. Consider the above reaction, the major product 'P' is: (1) (2) (3) (4)

Q42.Arrange the following metal complex/ compounds in the increasing order of spin only magnetic moment. Presume all the three, high spin system. (Atomic numbers Ce = 58, Gd = 64 and Eu = 63.) (a) (NH4)2[Ce (NO3)6] (b) Gd (NO3)3 and (c) Eu (NO3)3 (1) (b) < (a) < (c) (2) (c) < (a) < (b) (3) (a) < (b) < (c) (4) (a) < (c) < (b) JEE Main 2021 (16 Mar Shift 2) JEE Main Previous Year Paper

Q42.The number of non-ionisable hydrogen atoms present in the final product obtained from the hydrolysis of PCl5 is : (1) 0 (2) 1 (3) 2 (4) 3

Q42.Match List −I with List −II List −I List −II (a) Chlorophyll (i) Ruthenium (b) Vitamin −B12 (ii) Platinum (c) Anticancer drug (iii) Cobalt (d) Grubbs catalyst (iv) Magnesium Choose the most appropriate answer from the options given below: (1) a −iii , b −ii, c −iv, d −i (2) a −iv, b −iii , c −ii, d −i (3) a −iv, b −iii, c −i, d −ii (4) a −iv, b −ii, c −iii, d −i

Q42.Chemical nature of the nitrogen oxide compound obtained from a reaction of concentrated nitric acid and P4O10 (in 4 : 1 ratio) is: (1) acidic (2) basic (3) amphoteric (4) neutral

Q42.The correct order of bond dissociation enthalpy of halogens is: (1) F2 > Cl2 > Br2 > I2 (2) Cl2 > F2 > Br2 > I2 (3) I2 > Br2 > Cl2 > F2 (4) Cl2 > Br2 > F2 > I2

Q42.Which one of the following lanthanides exhibits +2 oxidation state with diamagnetic nature ? (Given Z for Nd = 60, Yb = 70, La = 57, Ce = 58) (1) Nd (2) Yb (3) Ce (4) La

Q42.In Freundlich adsorption isotherm at moderate pressure, the extent of adsorption ( mx ) is directly proportional to Px . The value of x is : (1) zero (2) 1 n (3) 1 (4) ∞