Practice Questions

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 additon of dilute NaOH to Cr3+ salt solution will give : (1) a solution of [Cr(OH)4]− (2) precipitate of [Cr(OH)6]3− (3) precipitate of Cr2 O3(H2O)n (4) precipitate of Cr(OH)3

Q42.The charges on the colloidal CdS sol and TiO2 sol are, respectively : (1) positive and positive (2) positive and negative (3) negative and negative (4) negative and positive

Q42.In the given chemical reaction, colors of theFe2 + and Fe3 + ions, are respectively : 5Fe2 + + MnO4- + 8H+ →Mn2 + + 4H2O + 5Fe3 + (1) Yellow, Green (2) Yellow, Orange (3) Green, Orange (4) Green, Yellow

Q42.Match List I with List II : (Both having metallurgical terms) List-I List-II Concentration of Ag (a) (i) Reverberatory furnace ore (b) Blast furnace (ii) Pig iron (c) Blister copper (iii) Leaching with dilute NaCN solution Froth floatation (d) (iv) Sulfide ores method Choose the correct answer from the options given below: (1) (a) −(iii), (b) −(ii), (c) −(i), (d) −(iv) (2) (a) −(iii), (b) −(iv), (c) −(i), (d) −(ii) (3) (a) −(iv), (b) −(i), (c) −(iii), (d) −(ii) (4) (a) −(iv), (b) −(iii), (c) −(ii), (d) −(i)

Q42.The incorrect statement among the following is: (1) Cr2 O3 is an amphoteric oxide (2) VOSO4 is a reducing agent (3) RuO4 is an oxidizing agent (4) Red colour of ruby is due to the presence of Co3+

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

Q43. Considering the above reaction, the major product among the following is: (1) (2) (3) (4) Q44. 2, 4 −DNP test can be used to identify : (1) aldehyde (2) amine (3) halogens (4) ether

Q43.The Eu2 + ion is a strong reducing agent in spite of its ground state electronic configuration (outermost) : [Atomic number of Eu = 63 ] (1) 4f66s2 (2) 4f7 (3) 4f76s2 (4) 4f6

Q43.In the following sequence of reactions the P is: (1) (2) (3) (4)

Q43.Number of Cl = O bonds in chlorous acid, chloric acid and perchloric acid respectively are: (1) 3, 1 and 1 (2) 4, 1 and 0 (3) 1, 1 and 3 (4) 1, 2 and 3

Q43.Which one of the following lanthanoids does not form MO2 ? [ M is lanthanoid metal] (1) Yb (2) Dy (3) Nd (4) Pr

Q43.The correct structures of trans −[NiBr 2(PPh3)2] and meridional −[Co (NH3)3(NO2)3] respectively, are: JEE Main 2021 (18 Mar Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q43. The product formed in the first step of the reaction of with excess Mg / Et2OEt = C2H5 is (1) (2) (3) (4)

Q43.Match List-I with List-II List-I List-II Name of oxo acid Oxidation state of ' P (a) Hypophosphorous acid (i) +5 (b) Orthophosphoric acid (ii) +4 (c) Hypophosphoric acid (iii) +3 (d) Orthophosphorous acid (iv) +2 (v) +1 Choose the correct answer from the options given below : (1) (a) −(v), (b) −(i), (c) −(ii), (d) −(iii) (2) (a) −(iv), (b) −(i), (c) −(ii), (d) −(iii) (3) (a) −(iv), (b) −(v), (c) −(ii), (d) −(iii) (4) (a) −(v), (b) −(iv), (c) −(ii), (d) −(iii)

Q43.The product obtained from the electrolytic oxidation of acidified sulphate solutions, is : (1) HSO−4 (2) HO3 SOOSO3 H (3) HO2 SOSO2 H (4) HO3 SOSO3 H

Q43.Given below are two statements: Statement I: Potassium permanganate on heating at 573 K forms potassium manganate. Statement II: Both potassium permanganate and potassium manganate are tetrahedral and paramagnetic in nature. In the light of the above statements, 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) Statement I is false but statement II is true (4) Both statement I and statement II are false

Q43.What is the correct order of the following elements with respect to their density? (1) Zn < Cu < Co < Fe < Cr (2) Cr < Zn < Co < Cu < Fe (3) Zn < Cr < Fe < Co < Cu (4) Cr < Fe < Co < Cu < Zn

Q43.Sulphide ion is soft base and its ores are common for metals (a) Pb (b) Al (c) Ag (d) Mg Choose the correct answer from the options given below (1) a and c only (2) a and d only (3) a and b only (4) c and d only

Q43.The incorrect statement is: (1) F2 is a stronger oxidizing agent than Cl2 in (2) On hydrolysis ClF forms HOCl and HF. aqueous solution. (3) Cl2 is more reactive than ClF. (4) F2 is more reactive than ClF.

Q43.According to the valence bond theory the hybridization of central metal atom is dsp2 for which one of the following compounds? (1) NiCl2 ⋅6H2O (2) K2[Ni(CN)4] (3) [Ni(CO)4] (4) Na2[NiCl4]

Q43.The major product of the following reaction, if it occurs by SN2 mechanism is : (1) (2) (3) (4)

Q43.Which one of the following metal complexes is most stable? (1) [Co(en)(NH3)4] Cl2 (2) [Co(en)3] Cl2 (3) [Co(en)2(NH3)2] Cl2 (4) [Co (NH3)6] Cl2

Q43. The given reaction can occur in the presence of : JEE Main 2021 (25 Jul Shift 1) JEE Main Previous Year Paper (a) Bromine water (b) Br2 in CS2, 273 K (c) Br2 / FeBr3 (d) Br2 in CHCl3, 273 K Choose the correct answer from the options given below: (1) (b) and (d) only (2) (a) and (c) only (3) (b), (c) and (d) only (4) (a), (b) and (d) only

Q43.Match list-I with list-II : List-I List-II (a) Mercury (i) Vapour phase refining (b) Copper (ii) Distillation refining (c) Silicon (iii) Electrolytic refining (d) Nickel (iv) Zone refining Choose the most appropriate answer from the option given below: (1) a −i, b −iv, c −ii, d −iii (2) a −ii, b −iii, c −i, d −iv (3) a −ii, b −iii, c −iv, d −i (4) a −ii, b −iv, c −iii, d −i JEE Main 2021 (18 Mar Shift 2) JEE Main Previous Year Paper