Practice Questions

Q42.The statement that is INCORRECT about Ellingham diagram is (1) provides idea about the reaction rate. (2) provides idea about free energy change. (3) provides idea about changes in the phases during (4) provides idea about reduction of metal oxide. the reaction.

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

Q43.The denticity of an organic ligand, biuret is : (1) 2 (2) 3 (3) 4 (4) 6 JEE Main 2021 (31 Aug Shift 1) JEE Main Previous Year Paper

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 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 set that represents the pair of neutral oxides of nitrogen is: (1) NO and N2O (2) N2O and N2O3 (3) N2O and NO2 (4) NO and NO2 JEE Main 2021 (17 Mar Shift 2) JEE Main Previous Year Paper

Q43.Identify the element for which electronic configuration in +3 oxidation state is [Ar]3 d5: (1) Ru (2) Mn (3) Co (4) Fe

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.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

Q43.Ellingham diagram is a graphical representation of : (1) ΔG vs P (2) (ΔG −TΔS) vs T (3) ΔH vs T (4) ΔG vs T

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.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 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. Identify the reagent(s) ' A ' and condition(s) for the reaction : (1) A = HCl; Anhydrous AlCl3 (2) A = HCl, ZnCl2 (3) A = Cl2 ; UV light (4) A = Cl2 ; dark, Anhydrous AlCl3

Q43.Consider two chemical reactions (A) and (B) that take place during metallurgical process: Δ (A) ZnCO3(s) →ZnO(s) + CO2(g) Δ (B) 2 ZnS(s) + 3O2(g) →2 ZnO(s) + 2 SO2(g) The correct option of names given to them respectively is: JEE Main 2021 (20 Jul Shift 2) JEE Main Previous Year Paper (1) (A) is calcination and (B) is roasting (2) Both (A) and (B) are producing same product so both are roasting (3) Both (A) and (B) are producing same product so both are calcination (4) (A) is roasting and (B) is calcination

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.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 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.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.Chalcogen group elements are : (1) Se, Te and Po. (2) O, Ti and Po. (3) Se, Tb and Pu . (4) S, Te and Pm .