Practice Questions

Q44.The gas liberated by the electrolysis of Dipotassium succinate solution is: (1) Ethane (2) Ethyne (3) Ethene (4) Propene

Q44. on mercuration-demercuration produces the major product: JEE Main 2014 (12 Apr Online) JEE Main Previous Year Paper (1) (2) (3) (4)

Q44.Resistance of 0.2 M solution of an electrolyte is 50 Ω. The specific conductance of the solution is 1.4 S m−1 . The resistance of 0.5 M solution of the same electrolyte is 280 Ω. The molar conductivity of 0.5 M solution of the electrolyte in S m2 mol−1 is : (1) 5 × 10−4 (2) 5 × 10−3 (3) 5 × 103 (4) 5 × 102

Q44.The standard electrode potentials (EoM+/M) of four metals −0.76 V, respectively. The sequence of deposition of metals on applying potential is (1) B > D > C > A (2) A > C > B > D (3) C > B > D > A (4) D > A > B > C

Q45.Which of the following statements about the depletion of ozone layer is correct? (1) The problem of ozone depletion is less serious at (2) The problem of ozone depletion is more serious poles because NO2 solidifies and is not available at poles because ice crystals in the clouds over for consuming CIO∘ radicals. poles act as catalyst for photochemical reactions involving the decomposition of ozone of Cl∙ and CIO∙ radicals. (3) Freons, chlorofluorocarbons, are inert. (4) Oxides of nitrogen also do not react with ozone Chemically, they do not react with ozone in in stratosphere. stratosphere.

Q45.The observed osmotic pressure for a 0. 10 M solution of Fe(NH4)2(SO4)2 at 25°C is 10. 8 atm. The expected and experimental (observed) values of Van't Hoff factor ' i' will be respectively; (R = 0. 082 L atm k− mol−1) (1) 4 and 4. 00 (2) 3 and 5. 42 (3) 5 and 4. 42 (4) 5 and 3. 42

Q46.The metal that cannot be obtained by the electrolysis of an aqueous solution of its salt is (1) Ag (2) Ca (3) Cu (4) Cr

Q47.The gas evolved on heating CaF2 and SiO2 with concentrated H2 SO4 , on hydrolysis gives a white gelatinous precipitate. The precipitate is: (1) Silicic acid (2) Calcium fluorosilicate (3) Hydrofluorosilicic acid (4) Silica gel

Q47.Given below are the half - cell reactions : Mn2+ + 2e−→Mn ; E∘= −1.18 V 2(Mn3+ + e−→Mn2+) ; E∘= +1.51 V The E∘ for 3Mn2+ →Mn + 2Mn3+ will be : (1) −2.69 V ; the reaction will not occur (2) −2.69 V ; the reaction will occur (3) −0.33 V ; the reaction will not occur (4) −0.33 V ; the reaction will occur

Q48.Given Fe3+(aq) + e−→Fe2+(aq); E0 = +0.77 V Al3+(aq) + 3e−→Al(s); E0 = −1.66 V Br2(aq) + 2e−→2Br−; E0 = +1.09 V Considering the electrode potentials, which of the following represents the correct order of reducing power? JEE Main 2014 (11 Apr Online) JEE Main Previous Year Paper (1) Fe2+ < Al < Br− (2) Br−< Fe2+ < Al (3) Al < Br−< Fe2+ (4) Al < Fe2+ < Br−

Q48.For the non-stoichiometry reaction, 2A + B →C + D, the following kinetic data were obtained in three separate experiments, all at 298 K. Initial Concentration Initial Concentration Initial rate of formation of C (A) (B) (mol L−S−) 0.1 M 0.1 M 1.2 × 10−3 0.1 M 0.2 M 1.2 × 10−3 0.2 M 0.1 M 2.4 × 10−3 The rate law for the formation of C is (1) dc dt = k[A][B] (2) dcdt = k[A]2[B] (3) dc dt = k[A][B]2 (4) dcdt = k[A]

Q48.How many electrons would be required to deposit 6.35 g of copper at the cathode during the electrolysis of an aqueous solution of copper sulphate? (Atomic mass of copper = 63.5u, NA = Avogadro's constant): (1) NA (2) NA 20 10 (3) NA (4) NA 5 2

Q48.Which of the following is not formed when H2S reacts with acidic K2Cr2O7 solution ? (1) K2SO4 (2) Cr2(SO4)3 (3) S (4) CrSO4

Q49.An octahedral complex with molecular composition M.5NH3.Cl.SO4 has two isomers, A and B. The solution of A gives a white precipitate with AgNO3 solution and the solution of B gives white precipitate with BaCl2 solution .The type of isomerism exhibited by the complex is : JEE Main 2014 (19 Apr Online) JEE Main Previous Year Paper (1) Coordinate isomerism (2) Geometrical isomerism (3) Ionisation isomerism (4) Linkage isomerism

Q49.In the reaction of formation of sulphur trioxide by contact process 2SO2 + O2 ⇌2SO3 the rate of reaction was measured as d[O2] dt = −2.5 × 10−4 mol L−1 s−1 . The rate of reaction is terms of [SO2] in molL−1 s−1 will be: (1) −1.25 × 10−4 (2) −2.50 × 10−4 (3) −3.75 × 10−4 (4) −5.00 × 10−4

Q49.The rate coefficient (k) for a particular reactions is 1.3 × 10−4M−1 s−1 at 100∘C, and 1.3 × 10−3 M−1 s−1 at 150∘C. What is the energy of activation (EA) (in kJ) for this reaction? (R = molar gas constant = 8.314JK−1 mol−1 ) (1) 16 (2) 60 (3) 99 (4) 132

Q49.The correct statement about the magnetic properties of [Fe(CN)6]3- and [FeF6]3- is : (Z = 26). (1) Both are paramagnetic. (2) Both are diamagnetic. (3) [Fe(CN)6]3- is paramagnetic, (4) [Fe(CN)6]3- is diamagnetic, [FeF6]3- is diamagnetic. [FeF6]3- is paramagnetic.

Q49.Which series of reactions correctly represents the chemical relations related to iron and its compound? JEE Main 2014 (06 Apr) JEE Main Previous Year Paper (1) dilute H2SO4 H2 SO4,O2 heat (2) O2, heat dilute H2SO4 heat −−−−−−Fe → FeSO4 → Fe2 (SO4)3 → Fe Fe → FeO → FeSO4 → Fe (3) Cl2, heat heat, air Zn (4) O2, heat CO, 600℃ CO, 700℃−−−−−Fe → FeCl3 → FeCl2 →Fe Fe → Fe3 O4 → FeO → Fe

Q50.A compound of vanadium chloride has spin only magnetic moment of 1. 73 BM. Its formula is (1) VCl2 (2) VCl5 (3) VCl4 (4) VCl3

Q50.Which of the following xenon-oxo compounds may not be obtained by hydrolysis of xenon fluorides? (1) XeO2 F2 (2) XeOF4 (3) XeO3 (4) XeO4

Q50.For the reaction, 2 N2O5 →4NO2 + O2 , the rate equation can be expressed in two ways −d[N2O5]dt = k [N2O5 ]nnd + d[NO2]dt = k′ [N2O5] k and k′ are related as: (1) k = k′ (2) 2k = k′ (3) k = 2k′ (4) k = 4k′

Q50.Nickel (Z = 28) combines with a uninegative monodentate ligand to form a diamagnetic complex [NiL4]2−. The hybridisation involved and the number of unpaired electrons present in the complex are respectively: (1) dsp2, zero (2) sp3, zero (3) dsp2,, one (4) sp3, two

Q51.An octahedral complex of Co3+ is diamagnetic. The hybridisation involved in the formation of the complex is : (1) dsp2 (2) d2sp3 (3) dsp3d (4) sp3d2

Q51.Shapes of certain interhalogen compounds are stated below. Which one of them is not correctly stated? (1) IF7 : pentagonal bipyramid (2) BrF5 : trigonal bipyramid (3) BrF3 : planar T-shaped (4) ICI3 : planar dimeric

Q52.The major product formed when 1, 1, 1- trichloropropane is treated with aqueous potassium hydroxide is : (1) 2 - Propanol (2) Propyne (3) Propionic acid (4) 1 - Propanol