Practice Questions

Q42.The number of possible isomeric products formed when 3 -chloro- 1 -butene reacts with HCl through carbocation formation is.........

Q42.Testosterone, which is a steroidal hormone, has the following structure. The total number of asymmetric carbon atom/s in testosterone is ____________. Q43. ‘ X ’ is: JEE Main 2023 (01 Feb Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q42.Molar mass of the hydrocarbon (X) which on ozonolysis consumes one mole of O3 per mole of (X) and gives one mole each of ethanal and propanone is ______ g mol–1 (Molar mass of C : 12 g mol–1 , H : 1 g mol–1 )

Q43.The osmotic pressure of solutions of PVC in cyclohexanone at 300 K are plotted on the graph. The molar mass of PVC is g mol−1 (Nearest integer) (Given : R = 0. 083 L atm K−1 mol−1 )

Q43.A metal M forms hexagonal close-packed structure. The total number of voids in 0. 02 mol of it is _____ ×1021 (Nearest integer) (Given NA = 6. 02 × 1023 )

Q44.Consider the cell Pt(s)|H2( s)(latm)|H+(aq, [H+] = 1) Fe3+(aq), Fe2+(aq) ∣Pt (s) 1 H2°= 0 V, T = 298 K Given: EFe3+ / Fe2+°= 0. 771 V and EH+/ 2 If the potential of the cell is 0. 712 V the ratio of concentration of Fe2+ to Fe3+ is (Nearest integer)

Q44.The number of pairs of the solution having the same value of the osmotic pressure from the following is (Assume 100% ionization) A. 0. 500 M C2H5 OH(aq) and 0. 25 M KBr(aq) B. 0. 100 M K4[Fe(CN)6](aq) and 0. 100 M FeSO4 (NH4)2 SO4(aq) C. 0. 05 M K4[Fe(CN)6] (aq) and 0. 25 M NaCl (aq) D. 0. 15 M NaCl(aq) and 0. 1 M BaCl2(aq) E. 0. 02 M KCl. MgCl2. 6H2O(aq) and 0. 05 M KCl(aq)

Q44.Three organic compounds A, B and C were allowed to run in thin layer chromatography using hexane and gave the following result (see figure). The Rf value of the most polar compound is _____ ×10–2

Q45. Pt (s)H2( g)(1 bar)|H+(aq)(1M)| M3+(aq), M+(aq) Pt(s) The Ecell for the given cell is 0. 1115 V at 298 K [M+(aq)] When = 10a [M3+(aq)] The value of a is ___________ Given : Eθ M3+/M+= 0. 2 V 2.303 RT = 0. 059 V F

Q45.Iron oxide FeO, crystallises in a cubic lattice with a unit cell edge length of 5. 0Å . If density of the FeO in the crystal is 4. 0 g cm−3 , then the number of FeO units present per unit cell is _____ (Nearest integer) Given : Molar mass of Fe and O is 56 and 16 g mol−1 respectively. NA = 6. 0 × 1023 mol−1

Q45.A metal M crystallizes into two lattices :- face centred cubic (fcc) and body centred cubic (bcc) with unit cell edge length of 2. 0 and 2. 5 °A respectively. The ratio of densities of lattices fcc to bec for the metal M is _______(Nearest integer) Q46. 20% of acetic acid is dissociated when its 5 g is added to 500 mL of water. The depression in freezing point of such water is _____ × 10−3∘C. Atomic mass of C, H and O are 12, 1 and 16 a.m.u. respectively. [Given : Molal depression constant and density of water are 1. 86 K kg mol−1 and 1 g cm−3 respectively. Q47. 1 × 10−5 M AgNO3 is added to 1 L of saturated solution of AgBr. The conductivity of this solution at 298 K is _______ × 10−8 S m−1 . [Given : Ksp(AgBr) = 4. 9 × 10−13 at 298 K λ0 = 6 × 10−3 Sm2 mol−1 Ag+ JEE Main 2023 (01 Feb Shift 2) JEE Main Previous Year Paper λ0Br−= 8 × 10−3 Sm2 mol−1 λ0 = 7 × 10−3 Sm2 mol−1] NO−3

Q45.For the first order reaction A →B the half life is 30 min. The time taken for 75% completion of the reaction is mm. (Nearest integer) Given : log 2 = 0. 3010 log 3 = 0. 4771 log 5 = 0. 6989

Q45.Number of crystal systems from the following where body centred unit cell can be found, is _____. Cubic, tetragonal, orthorhombic, hexagonal, rhombohedral, monoclinic, triclinic

Q45.The Total pressure observed by mixing two liquid A and B is 350 mm Hg when their mole fractions are 0. 7 and 0. 3 respectively. The Total pressure becomes 410 mm Hg if the mole fractions are changed to 0. 2 and 0. 8 respectively for A and B . The vapour pressure of pure A is ______ mm Hg . (Nearest integer) Consider the liquids and solutions behave ideally

Q45.The equilibrium constant for the reaction Zn(s) + Sn2+(aq) ⇌Zn2+(aq) + Sn(s) is 1 × 1020 at 298 K . The magnitude of standard electrode potential of Sn / Sn2+ if E0 = −0. 76 V is _____ ×10−2 V . (Nearest Zn2* / Zn integer) Given : 2.303 RT = 0. 059 V F

Q46.The total number of stereoisomers for the complex [Cr ( ox ) 2ClBr] 3 – (where ox = oxalate) is (1) 3 (2) 2 (3) 4 (4) 1

Q46.Consider the following pairs of solution which will be isotonic at the same temperature. The number of pairs of solutions is/ are _____ A. 1 M aq. NaCl and 2 M aq. urea B. 1 M aq. CaCl2 and 1. 5 M aq. KCl C. 1. 5 M aq. AlCl3 and 2 M aq. Na2 SO4 D. 2. 5 M aq. KCl and 1 M aq. Al2(SO4)3 JEE Main 2023 (06 Apr Shift 2) JEE Main Previous Year Paper

Q46.Lead storage battery contains 38% by weight solution of H2 SO4 . The van't Hoff factor is 2. 67 at this concentration. The temperature in Kelvin at which the solution in the battery will freeze is _____ (Nearest integer). Given Kf = 1. 8 K kg mol−1

Q46.The number of units, which are used to express concentration of solutions from the following is _________. (Mass percent, Mole, Mole fraction, Molarity, ppm, Molality.)

Q46.Solid Lead nitrate is dissolved in 1 litre of water. The solution was found to boil at 100. 15°C. When 0. 2 mol of NaCl is added to the resulting solution, it was observed that the solution froze at −0. 8°C. The solutbility product of PbCl2 formed is _____ ×10−6 at 298 K. (Nearest integer) Given : Kb = 0. 5K kg mol−1 and Kf = 1. 8 kg mol−1 . Assume molality to be equal to molarity in all cases. JEE Main 2023 (29 Jan Shift 1) JEE Main Previous Year Paper

Q46.What weight of glucose must be dissolved in 100 g of water to lower the vapour pressure by 0. 20 mm Hg ? (Assume dilute solution is being formed) Given: Vapour pressure of pure water is 54. 2 mm Hg at room temperature.Molar mass of glucose is 180 g mol−1 (1) 3. 59 g (2) 3. 69 g (3) 4. 69 g (4) 2. 59 g

Q46.A sample of a metal oxide has formula M0.83O1.00 . The metal M can exist in two oxidation states +2 and +3. In the sample of M0.83O1.00 , the percentage of metal ions existing in +2 oxidation state is %. (nearest integer) JEE Main 2023 (31 Jan Shift 2) JEE Main Previous Year Paper

Q46.Solution of 12 g of non-electrolyte (A) prepared by dissolving it in 1000 mL of water exerts the same osmotic pressure as that of 0. 05 M glucose solution at the same temperature. The empirical formula of A is CH2 O. The molecular mass of A is ________g. (Nearest integer)

Q46.For conversion of compound A →B, the rate constant of the reaction was found to be 4. 6 × 10−5 Lmol −1 s−1 . The order of the reaction is _____ .

Q47.The electrode potential of the following half cell at 298 K X X2+(0. 001M)∥Y2+(0. 01M) Y is _____ ×10−2 V (Nearest integer) Given : E0 = −2. 36 V X2+∣X E0 = +0. 36 V Y2+Y 2.303 RT = 0. 06 V F