Practice Questions

Q47.Which of the following will most readily give the dehydrohalogenation product? (1) (2) (3) (4) JEE Main 2018 (15 Apr Shift 1 Online) JEE Main Previous Year Paper

Q47.In the extraction of copper from its sulphide ore, metal is finally obtained by the oxidation of cuprous sulphide with: (1) SO2 (2) Fe2 O3 (3) Cu2 O (4) CO

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.The major product of the following reaction is (1) (2) (3) (4)

Q48.Two 5 molal solutions are prepared by dissolving a non-electrolyte, non-volatile solute separately in the solvents X and Y . The molecular weights of the solvents are MX and MY , respectively where MX = 43 MY . The relative lowering of vapour pressure of the solution in X is " m " times that of the solution in Y. Given that the number of moles of solute is very small in comparison to that of solvent, the value of "m" is: (1) 3 (2) 1 4 2 (3) 1 (4) 4 4 3 conversion of A (in

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

Q48.For 1 molal aqueous solution of the following compounds, which one will show the highest freezing point? JEE Main 2018 (08 Apr) JEE Main Previous Year Paper (1) [Co (H2O)3 Cl3]. 3H2O (2) [Co (H2O)6] Cl3 (3) [Co (H2O)5 Cl] Cl2. H2O (4) [Co (H2O)4 Cl2] Cl. 2H2O

Q49.How long (approximate) should water be electrolysed by passing through 100 amperes current so that the oxygen released can completely burn 27. 66 g of diborane? (Atomic weight of B = 10. 8 u) (1) 1. 6 hours (2) 6. 4 hours (3) 0. 8 hours (4) 3. 2 hours

Q49.When XO2 is fused with an alkali metal hydroxide in presence of an oxidizing agent such as KNO3 ; a dark green product is formed which disproportionate in acidic solution to afford a dark purple solution. X is: JEE Main 2018 (16 Apr Online) JEE Main Previous Year Paper (1) Mn (2) Cr (3) V (4) Ti

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

Q49. N2O5 decomposes to NO2 and O2 follows the first order kinetics. After 50 minutes, the pressure inside the vessel increases from 50 mm Hg to 87. 5 mm Hg . The pressure of the gaseous mixture after 100 minutes at constant temperature will be: (1) 136. 5 mm Hg (2) 106. 25 mm Hg (3) 175. 0 mm Hg (4) 116. 25 mm Hg

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

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.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.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.Which of the following arrangements shows the schematic alignment of magnetic moments of antiferromagnetic substance? (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.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 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)

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)

Q52. N2O5 decomposes to NO2 and O2 and follows first order kinetics. After 50 minutes, the pressure inside the vessel increases from 50 mm Hg to 87.5 mm Hg . The pressure of the gaseous mixture after 100 minutes at constant temperature will be ______. (1) 136.25 mm Hg (2) 106.25 mm Hg (3) 175.0 mm Hg (4) 116.25 mm Hg

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

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