TYBSC SEM VI PHYSICAL CHEMISTRY (MODEL MCQ’s)12Which of the following is a uni-univalent electrolyte?a) KClb) CaCl2c) AlCl3d) MgCl2The ionic strength of a solution of molality mi and valency of the ion Zi is1a) 𝜇 2 𝑚𝑖 𝑍𝑖 2b) 𝜇 𝑚𝑖 𝑍𝑖 21c) 𝜇 2 𝑍𝑖 213d) 𝜇 2 𝑚𝑖 𝑍𝑖 2Which of the following is an example of electrolyte concentration cell with transference?a)b)c)d)456Cu CuSO4 AgNO3 AgPt , H2(g) HCl(aq) AgCl (s) AgPt , H2(g) HCl(aq)(a1) AgNO3(a2) AgAg – AgCl NaCl (a1) NaCl(a2) AgCl - AgA concentration cell which has salt bridge in its representation isa) electrolyte concentration cell with transferenceb) Electrode concentration cellc) Electrolyte concentration cell without transferenced) Gas concentration cellThe total emf of the electrolyte concentration cell with transference containing the liquid junction potential is given by------a) 𝐸𝑗 𝐸𝑜𝑥𝑖𝑑𝑎𝑡𝑖𝑜𝑛 𝐸𝑟𝑒𝑑𝑢𝑐𝑡𝑖𝑜𝑛b) 𝐸𝑐𝑒𝑙𝑙 𝐸𝑜𝑥𝑖𝑑𝑎𝑡𝑖𝑜𝑛 𝐸𝑟𝑒𝑑𝑢𝑐𝑡𝑖𝑜𝑛 𝐸𝑗c) 𝐸𝑐𝑒𝑙𝑙 𝐸𝑜𝑥𝑖𝑑𝑎𝑡𝑖𝑜𝑛 𝐸𝑟𝑒𝑑𝑢𝑐𝑡𝑖𝑜𝑛 𝐸𝑗d) 𝐸𝑗 𝐸𝑜𝑥𝑖𝑑𝑎𝑡𝑖𝑜𝑛 𝐸𝑟𝑒𝑑𝑢𝑐𝑡𝑖𝑜𝑛The activity ‘a’ is related to the activity coefficient ‘‘ 𝛾’ by the equation𝑚a) 𝑎 𝛾b) 𝛾 𝑎 𝑚c) 𝑎 𝑚 𝛾d) 𝑎 𝑚
78910111213While working, the free energy of a concentration cell due to the transfer of matter from one half cell to other.a) increaseb) decreasec) no changed) first increase, then decreaseDecomposition potential is the potential that must be applied between two electrodes immersed in the electrolytic solution so asto bring about continuous decomposition of an electrolyte.a) minimumb) maximumc) averaged) MeanTafel equation is the relation between hydrogen overvoltage and .a) current densityb) decomposition potentialc) emfd) ConcentrationThe ionic strength of 0.03m NaCl solution is same as that of solution.a) 0.02m H2SO4b) 0.05m NaClc) 0.01m ZnCl2d) 0.03m MgCl2The activity of 0.5 molal MgNO3 solution with activity coefficient 0.9 isa) 0.295b) 0.3645c) 0.246d) 0.335A hydrogen overvoltage on a metal cathode was found to be 0.6V at a current density of 0.1 mA/ cm2. The discharge potential ofhydrogen on this electrode from a solution of pH 6.2 isa) 0.423Vb) 0.967Vc) 0.763Vd) 0.967VWhen the current density of an electrode is reduced to 1/10th of its previous value, then the change in overvoltage of hydrogen at theelectrode is (b 0.15)a) 0.10Vb) 0.12V
14c) 0.15Vd) 0.25VFor the cell,15Ag AgNO3 (m 0.01, r 0.94) AgNO 3 ( m 0.1, γ 0.82) Ag , if the transport number of Ag is 0.466V, then the emf of the cellisa) 5 .94 x 10 – 1 Vb) 5.94 x 10 – 2 Vc) 5.94 x 10 – 3 Vd) 5.94 x 10 – 4 VSilk is an example of polymer.a)b)c)d)16Ʃ𝑁𝑖 ificialFormula is used for calculating molecular weight.17a) Number averageb) Weight averagec) Viscosity averaged) Z-averageWhich of the following is not a characteristic property LED?18a) Greater power efficiencyb) Light weightc) Convert electric power into visible lightd) Heavy weightWhich of the following is an example of thermoplastic polymer?19a) Cellulose nitrateb) Bakelitec) Vulcanized rubberd) Epoxy resinPoiseuille equation is used to measurea) Coefficient of viscosityb) Densityc) Pressure
20d) TemperatureAntistatic agent improves of a polymer surface by absorbing a thin layer of moisture on surface.21a) Resistanceb) Conductancec) Solubilityd) Thermal stabilityWhich of the following polymer can be reclaimed from waste?22a) Cross linkedb) Thermosettingc) Thermoplasticd) VulcanizedColorants are available in the form of .23a) Curing agentb) Diodesc) Ultraviolet absorbersd) Pigment and DyesFor monodisperse polymer, polydispersity index is24a) Equal to Oneb) Less than onec) Greater than oned) ZeroIn viscosity average molecular weight, value of α can vary from25a) 0.03 and 0.07b) 0.1 and 0.3c) 0.05 and 0.1d) 0.5 and 1.0Amines are for epoxy resin.26a) Antistatic agentb) Colorantc) Stabilizerd) Curing agentCalculate weight average molecular weight of a polymer 10 molecules of molecular weight 15000 and 10 molecules of molecular weight20000.
32a) 15630b) 18587c) 17857d) 12650Which of the following is known as the Schrodinger wave equation𝑐a) E h𝜆b) E mc2c) λ h/pd) Hψ Eψis the square of the magnitude of the wave function.a) current densityb) probability densityc) zero densityd) volume densityIn the Heisenberg’s uncertainty principle, which two measurable properties of a particle cannot be observed precisely at the same time?a) Mass and velocityb) Position and momentumc) Mass and positiond) Momentum and massAccording to the de Broglie relation, the wavelength of a matter wave is inversely proportional toa) Planck’s constantb) momentum of the particlec) timed) amplitudeCompton effect is the ejection of from metal surface when it is struck by electromagnetic radiation.a) protonb) electron radiationc) Photond) neutronThe electrons are when X-rays strikes a metal surface33a) emittedb) reflectedc) diffractedd) scattered̂ ψ Eψ which is the Eigen value?In the Schrodingers wave equation 𝐻2728293031
34353637383940a) Hamiltonian operatorb) wave functionc) total energyd) Hamiltonian functionIf 𝐴̂ 2x 𝐵̂ cos x f(x) x Find ( 𝐴̂ ̂𝐵 ) f(x)a) 2x2 xcosxb) 2x2 cosxc) 2x cosxd) 2x2 cosxCalculate the de Broglie wavelength of a neutron (m 1.67 10-27 kg) which has a speed of 4.0 m/s. [h 6.626 10‒34 Js]a) 9.919 10‒8 mb) 9.919 10‒61 mc) 15.870 10‒6 md) 9.919 108 mTwo operators 𝐴̂and 𝐵̂ on a function f(x) should be Additive, ifa) 𝐴̂𝐵̂ f(x)b) 𝐴̂ f(x) ̂𝐵 f(x)c) 𝐴̂ f(x) f(x)d) 𝐴̂ f(x) ‒ ̂𝐵 f(x)The energy difference between the valence band and conduction band in a semiconductor is called .a) Band gapb) energy rangec) Energy bandd) InsulatorA semiconductor in which the conductance is due to the presence of extra electrons is called .a) p- type semiconductorb) n- type semiconductorc) insulatord) Metallic conductorIn semiconductors the gap between the valence band and conduction band is .a) Largeb) zeroc) smalld) Very largeIn the electrolysis of water is produced at the cathode.
41424344454647a) oxygenb) hydrogenc) Carbon dioxided) NitrogenNuclear magnetic resonance spectrum is a result of the .a) movements of neutrons in the nucleusb) Electrons being unpairedc) behavior of nucleus as a magnetd) Neutrons being unpairedWhich of the following cannot be used as a solvent in NMR spectroscopy?a) CCl4b) CDCl3c) C6D6d) H2ONuclear spin is due toa) Spin of protonsb) Spin of electronsc) Half integral or integral value of the spind) RelaxationThe nuclear transition in NMR is induced by the radiation of frequencya) microwaveb) radio wavec) uv-visibled) infraredA nucleus in the high energy state transfers its energy to the nucleus in the surrounding framework is called .a) Spin-spin relaxationb) Spin-lattice relaxationc) activationd) deactivationThe protons, neutrons, and electrons are collectively known as .a) nucleonsb) fermionsc) nucleusd) protonsIn the ESR spectrum ,the spectrum is recorded in derivative mode becausea) It is normal procedure
48495051b) The width of the peak is too small to record itc) It is easier to record in that moded) The width of the peak is too broad to record itIn ESR and NMR spectrometer the magnetic field generated by the magnet must be .a) homogeneousb) heterogeneousc) staticd) dynamicIn ESR a field strength of units is useda) 0.34 Tb) 3.4Tc) 34 Td) 340TWhat happens when a radiation is absorbed by a spinning nucleus present in a magnetic field?a) The angle of precession flips so that the magnetic moment of the nucleus opposes the applied fieldb) The precessional frequency of the nucleus increasesc) The nucleus spins fasterd) The nucleus stops spinningWhich of the following statement is true?a) Microwave region is associated with ESRb) IR region is associated with ESRc) UV-visible region is associated with ESRd) Radiofrequency region is associated with ESR
TYBSC SEM VI PHYSICAL CHEMISTRY (MODEL MCQ’s) 1 Which of the following is a uni-univalent electrolyte? a) KCl b) CaCl 2 c) AlCl 3 d) MgCl 2 2 and valency of the ion Zi is ____The ionic strength of a solution of molality m