Practice Questions

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.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.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.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.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. 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.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.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.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.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

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

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.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.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.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.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.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.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 _____ .

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

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

Q47.The number of correct statements from the following is........... A. Ecell is an intensive parameter B. A negative Eo means that the redox couple is a stronger reducing agent than the H+/H2 couple. C. The amount of electricity required for oxidation or reduction depends on the stoichiometry of the electrode reaction. D. The amount of chemical reaction which occurs at any electrode during electrolysis by a current is proportional to the quantity of electricity passed through the electrolyte.

Q47.A metal surface of 100 cm2 area has to be coated with nickel layer of thickness 0. 001 mm. A current of 2A was passed through a solution of Ni (NO3)2 for ‵x′ seconds to coat the desired layer. The value of x is _________. (Nearest integer) ( ρNi (density of Nickel) is 10 g mL–1, Molar mass of Nickel is 60 g mol−1 F = 96500 Cmol−1 )

Q47.If the boiling points of two solvents X and Y (having same molecular weights) are in the ratio 2: 1 and their enthalpy of vaporizations are in the ratio 1 : 2, then the boiling point elevation constant of X is m times the boiling point elevation constant of Y . The value of m is (nearest integer).