Practice Questions

Q37.Which of the following molecules has two sigma (σ) and two pi (π) bonds? (1) C2H4 (2) N2 F2 (3) C2H2Cl2 (4) HCN

Q38.Consider the reaction : H2SO3(aq) + Sn4+(aq) + H2O(l) →Sn2+(aq) + HSO−4(aq) + 3H+(aq) Which of the following statements is correct ? (1) Sn4+ is the oxidizing agent because it undergoes (2) Sn4+ is the reducing agent because it undergoes oxidation oxidation (3) H2SO3 is the reducing agent because it (4) H2SO3 is the reducing agent because it undergoes reduction undergoes oxidation

Q38.The initial volume of a gas cylinder is 750.0 mL. If the pressure of gas inside the cylinder changes from 840.0 mmHg to 360.0 mmHg, the final volume the gas will be: (1) 1.750 L (2) 3.60 L (3) 4.032 L (4) 7.50 L

Q40.What happens when an inert gas is added to an equilibrium keeping volume unchanged? (1) More product will form (2) Less product will form (3) More reactant will form (4) Equilibrium will remain unchanged

Q40.Example of a three-dimensional silicate is : (1) Ultramarines (2) Feldspars (3) Zeolites (4) All of these

Q41.The conjugate base of hydrazoic acid is: (1) N−3 (2) N−3 (3) N−2 (4) HN−3

Q42.The correct IUPAC name of the following compound is : (1) 4 - methyl - 3 - ethylhexane (2) 3 - ethyl - 4 - methylhexane (3) 4 - ethyl - 3 - methylhexane (4) 3, 4 - ethylmethylhexane

Q43.The total number of octahedral void (s) per atom present in a cubic close packed structure is : (1) 1 (2) 2 (3) 3 (4) 4

Q44.For an ideal solution of two components A & B, which of the following is true? (1) ΔHmixing > 0 (zero) (2) A −B interaction is stronger than A −A & B −B. interactions (3) A −A, B −B & A −B interactions are (4) ΔHmixing < 0 (zero) identical

Q45.The equivalent conductance of NaCl at concentration C and at infinite dilution are λC and λ∞ , respectively. The correct relationship between λC and λ∞ is given as : (where the constant B is positive) (1) λC = λ∞+ (B)C (2) λC = λ∞−(B)C (3) λC = λ∞−(B)√C (4) λC = λ∞+ (B)√C

Q45.The half-life period of a first-order reaction is 15 minutes. The amount of substance left after one hour will be (1) 1 of the original amount (2) 1 of the original amount. 16 8 (3) 1 of the original amount. (4) 1 of the original amount. 32 4

Q46.The appearance of colour in solid alkali metal halides is generally due to: (1) Schottky defect (2) Frenkel defect (3) Interstitial position (4) F-centres

Q46.Choose the correct statement with respect to the vapour pressure of a liquid among the following : (1) Increases non-linearly with increasing (2) Decreases non-linearly with increasing temperature temperature (3) Decreases linearly with increasing temperature (4) Increases linearly with increasing temperature

Q46.Global warming is due to increase of: (1) methane and nitrous oxide in atmosphere (2) methane and CO2 in atmosphere (3) methane and O3 in atmosphere (4) methane and CO in atmosphere

Q46.The form of iron obtained from blast furnace is : (1) Cast Iron (2) Wrought Iron (3) Steel (4) Pig Iron

Q47.In a monoclinic unit cell, the relation of sides and angles are respectively: (1) a = b ≠c and α = β = γ = 90∘ (2) a ≠ b ≠ c and α = β = γ = 90∘ (3) a ≠b ≠c and β = γ = 90∘≠α (4) a ≠b ≠c and α ≠β ≠γ ≠90∘

Q47.For the reaction, 3A + 2B →C + D, the differential rate law can be written as : (1) + 31 d[A]dt = −d[C]dt = k[A]n[B]m (2) 13 d[A]dt = d[C]dt = k[A]n[B]m (3) −13 d[A]dt = d[C]dt = k[A]n[B]m (4) −d[A]dt = d[C]dt = k[A]n[B]m

Q47.In some solutions, the concentration of H3O+ remains constant even when small amounts of strong acid or strong base are added to them. These solutions are known as: (1) Ideal solutions (2) Colloidal solutions (3) True solutions (4) Buffer solutions

Q48.Which one of the following ores is known as Malachite: (1) Cu2 S (2) Cu2 O (3) Cu (OH)2. CuCO3 (4) CuFeS2

Q50.Among the following oxoacids, the correct decreasing order of acid strength is : (1) HOCl > HClO2 > HClO3 > HClO4 (2) HClO4 > HOCl > HClO2 > HClO3 (3) HClO4 > HClO3 > HClO2 > HOCl (4) HClO2 > HClO4 > HClO3 > HOCl

Q51.Amongst the following, identify the species with an atom in +6 oxidation state. (1) CrO2Cl2 (2) [Cr(CN)6]3− (3) Cr2O3 (4) [MnO4]−

Q51.Which one of the following exhibits the large number of oxidation states? (1) Ti(22) (2) V(23) (3) Cr(24) (4) Mn(25)

Q52.Copper becomes green when exposed to moist air for a long period. This is due to: (1) the formation of a layer of cupric oxide on the (2) the formation of a layer of basic carbonate of surface of copper. copper on the surface of copper. (3) the formation of a layer of cupric hydroxide on (4) the formation of basic copper sulphate layer on the surface of copper. the surface of the metal. JEE Main 2014 (12 Apr Online) JEE Main Previous Year Paper

Q53.Consider the coordination compound, [Co(NH3)6]Cl3 . In the formation of this complex, the species which acts as the Lewis acid is: (1) [Co(NH3)6]3+ (2) Cl− (3) Co3+ (4) NH3

Q53.For the compounds CH3Cl, CH3Br, CH3I and CH3F, the correct order of increasing C-halogen bond length is : (1) CH3F < CH3Br < CH3Cl < CH3I (2) CH3F < CH3I < CH3Br < CH3Cl (3) CH​3F < CH3Cl < CH3Br < CH3I (4) CH3Cl < CH3Br < CH3F < CH3I JEE Main 2014 (09 Apr Online) JEE Main Previous Year Paper −