Practice Questions

Q48.Among the oxides of nitrogen: N2O3, N2O4 and N2O5; the molecule (s) having nitrogen - nitrogen bond is/are: (1) N2O3 and N2O4 (2) N2O4 and N2O5 (3) N2O3 and N2O5 (4) Only N2O5

Q48.When an electric current is passed through acidified water, 112 mL of hydrogen gas at N.T.P was collected at the cathode in 965 seconds. The current passed, in ampere, is: (1) 2.0 (2) 0.1 (3) 0.5 (4) 1.0

Q49.The increasing order of nitration of the following compounds is : (1) < (B) < (D) < (C) (2) < (B) < (C) < (D) (3) < (A) < (C) < (D) (4) < (A) < (D) < (C)

Q49.For a first order reaction, A →P, t1/2 (half-life) is 10 days. The time required for 41 th days) is: (ln 2 = 0.693, ln 3 = 1.1). (1) 3.2 (2) 2.5 (3) 4.1 (4) 5

Q50.The incorrect statement is: (1) Cu2+ ion gives chocolate coloured precipitate with potassium ferrocyanide solution (2) Cu2+ and Ni2+ ions give black precipitate with H2S in presence of HCl solution (3) Ferric ion gives blood red colour with potassium thiocyanate (4) Cu2+ salts give red coloured borax bead test in reducing flame

Q50.Which of the following statements about colloids is false? (1) When silver nitrate solution is added to (2) Freezing point of colloidal solution is lower than potassium iodide solution a negatively charged true solution at same concentration of a solute. colloidal solution is formed. (3) Colloidal particles can pass through ordinary (4) When excess of electrolyte is added to colloidal filter paper. solution, colloidal particle will be precipitated.

Q50.If x gram of gas is adsorbed by m gram of adsorbent at pressure P the plot of log mx versus log P is linear. The slope of the plot is: ( m and k are constants and n > 1 ) (1) log k (2) n1 (3) 2k (4) n JEE Main 2018 (15 Apr Shift 2 Online) JEE Main Previous Year Paper

Q50.At 518oC, the rate of decomposition of a sample of gaseous acetaldehyde, initially at a pressure of 363 Torr was 1 .00 Torr s−1 when 5% had reacted and 0 .50 Torr s−1 when 33% had reacted. The order of the reaction is: (1) 0 (2) 2 (3) 3 (4) 1

Q51.The compound that does not produce nitrogen gas by thermal decomposition is: (1) (NH4)2SO4 (2) Ba(N3)2 (3) (NH4)2Cr2O7 (4) NH4NO2

Q51.In a complexometric titration of metal ion with ligand M (Metal ion) + L(Ligand) →C (Complex) end point is estimated spectrophotometrically (through light absorption). If 'M' and 'C' do not absorb light and only 'L' absorbs then the titration plot between absorbed light (A) versus volume of ligand 'L' (V ) would look like: (1) (2) (3) (4)

Q51.When an electric current is passes through acidified water, 112 mL of hydrogen gas at N.T.P. was collected at the cathode in 965 seconds. The current passed, in ampere, is : JEE Main 2018 (15 Apr Shift 1 Online) JEE Main Previous Year Paper (1) 2.0 (2) 0.1 (3) 0.5 (4) 1.0

Q51.In the leaching method, bauxite ore is digested with a concentrated solution of NaOH that produces ' X '. When CO2 gas is passed through the aqueous solution of ' X ′ , a hydrated compound ' Y′ ' is precipitated. ' X ' and ' Y ' respectively are. (1) Na [Al(OH)4] and Al2(CO3)3 ⋅xH2O (2) Al(OH)3 and Al2O3 ⋅xH2O (3) NaAlO2 and Al2(CO3)3 ⋅xH2O (4) Na [Al(OH)4] and Al2O3 ⋅xH2O

Q51.Xenon hexafluoride on partial hydrolysis produces compounds 'X' and 'Y' and the respective oxidation states of Xe are: (1) XeOF2 (+4) and XeO3 (+6) (2) XeOF4 (+6) and XeO3 (+6) (3) XeO2 F2 (+6) and XeO2 (+4) (4) XeOF4 (+6) and XeO2 F2 (+6)

Q52.In XeO3 F2 , the number of bond pair(s), π-bond(s) and lone pair(s) on Xe atom respectively are: (1) 5,3,0 (2) 5, 2, 0 (3) 4,2,2 (4) 4, 4, 0

Q52.A white sodium salt dissolves readily in water to give a solution which is neutral to litmus. When silver nitrate solution is added to the before mentioned solution, a white precipitate is obtained which does not dissolve in dilute nitric acid. The anion is: (1) CO2−3 (2) SO2−4 (3) S 2− (4) Cl−

Q52.In Wilkinson's catalyst, the hybridization of central metal ion and its shape are respectively: (1) sp3d, trigonal bipyramidal (2) d2sp3 , octahedral (3) dsp2 , square planar (4) sp3 , tetrahedral

Q53.Which of the following complexes will show geometrical isomerism? (1) Potassium tris(oxalato)chromate(III) (2) Pentaaquachlorochromium(II)chloride (3) Aquachlorobis(ethylenediamine)cobalt(II)chloride (4) Potassiumamminetrichloroplatinate(II)

Q53.Which of the following statements about colloids is false? (1) When silver nitrate solution is added to (2) Freezing point of colloidal solution is lower than potassium iodide solution, a negatively charged true solution at same concentration of a solute colloidal solution is formed (3) Colloidal particles can pass through ordinary (4) When excess of electrolyte is added to colloidal filter paper solution, colloidal particle will be precipitated

Q53.The number of P −O bonds in P4O6 is: (1) 9 (2) 6 (3) 12 (4) 18

Q53.The oxidation states of Cr in [Cr (H2O)6] Cl3, [Cr (C6H6)2] and K2[Cr (CN)2(O)2(O2)(NH3 )] , respectively, are: (1) +3, 0 and +4 (2) +3, + 4 and +6 (3) +3, + 2 and +4 (4) +3, 0 and +6

Q54.Which of the following will most readily give the dehydrohalogenation product? JEE Main 2018 (15 Apr) JEE Main Previous Year Paper (1) (2) (3) (4)

Q54.Xenon hexafluoride on partial hydrolysis produces compounds ' X ' and ' Y '. Compounds ' X ' and ' Y ' and the oxidation state of Xe are respectively : (1) XeOF4(+6) and XeO3(+6) (2) XeO2(+4) and XeO3(+6) (3) XeOF4(+6) and XeO2F2(+6) (4) XeO2F2(+6) and XeO2(+4)

Q54.The correct order of spin-only magnetic moments among the following is: (Atomic number: Mn = 25, Co = 27, Ni = 28, Zn = 30 ) (1) [ZnCl4]2−> [NiCl4]2−> [CoCl4]2−> [MnCl4]2− (2) [CoCl4]2−> [MnCl4]2−> [NiCl4]2−> [ZnCl4]2− (3) [NiCl4]2−> [CoCl4]2−> [MnCl4]2−> [ZnCl4]2− (4) [MnCl4]2−> [CoCl4]2−> [NiCl4]2−> [ZnCl4]2−

Q54.The major product of the following reaction is: (1) (2) (3) (4) JEE Main 2018 (08 Apr) JEE Main Previous Year Paper

Q55.The correct combination is : (1) [NiCl4]2− - square-planar; [Ni(CN)4]2− - (2) [Ni(CN)4]2− -tetrahedral; [Ni(CO)4] - paramagnetic paramagnetic (3) [NiCl4]2− - paramagnetic; [Ni(CO)4] - tetrahedral(4) [NiCl4]2− - dimagnetic; [Ni(CO)4] -square-planar