167 questions from a source that prints this span of years rather than the year of each question. Each opens with its answer and explanation.
ABC26PH0710 · Given that the most probable speed of oxygen gas is 1000 m s-1, the mean/average speed (m s-1) under the same conditions is: · Gaseous State – General
ABC26PH0711 · For an ideal gas, the plot that is Nonlinear is: · Gaseous State – General
ABC26PH0712 · Consider two identical containers, one with 1 mole of H2 and the other with 1 mole of He. If the root-mean square (RMS) velocities of the… · Gaseous State – General
ABC26PH0713 · 7. (i) Write the expression for the vibrational contribution to the total energy of CH4(g) at 500 K. All the vibrational modes are active… · Gaseous State – General
ABC26PH0714 · Based on the principle of equipartition of energy, the molar heat capacity of CO2 at constant volume Cv,m is: · Gaseous State – General
ABC26PH0715 · The Maxwell probability distribution of molecular speeds for a gas is: F(v)dv = 4 pi v2 (m/(2 pi kT))3/2exp (-(mv2)/2kT)dv where 'v' is the… · Gaseous State – General
ABC26PH0716 · The average speed of H2, N2 and O2 gas molecules is in the order · Gaseous State – General
ABC26PH0717 · According to the equipartition principle of energy, the molar heat capacity at constant volume for CO2(g), SO2(g) and H2O(g) follows the… · Gaseous State – General
ABC26PH0718 · According to the equipartition principle, the predicted high temperature limiting value of the molar heat capacity at constant volume for… · Gaseous State – General
ABC26PH0719 · In the gas phase, the ratio of excluded volume to molecular volume for a spherical molecule is ____ · Gaseous State – General
ABC26PH0720 · In an ideal monoatomic gas, the speed of sound is given by √(5RT/3M). If the speed of sound in argon at 25^ is 1245 km h-1, the root mean… · Gaseous State – General
ABC26PH0721 · The relationship between the van der Waals 'b' coefficient of N2 and O2 is · Gaseous State – General
ABC26PH0722 · From the kinetic theory of gases, the ratio of most probable speed (Cmp) to root mean square speed (Crms) is · Gaseous State – General
ABC26PH0723 · Cu(s) + 4H^+(aq) + 2NO3^-(aq) → 2NO2(g) + Cu2+(aq) + 2H2O(l) In the above reaction at 1 atm and 298 K, if 6.36 g of copper is used… · Gaseous State – General
ABC26PH0724 · The behavior of Cl2 is closest to ideal gas behavior at · Gaseous State – General
ABC26PH0725 · Assuming ideal gas behavior, the density of O2 gas at 300 K and 1.0 atm is ____ g L-1 (rounded up to two decimal places). [R = 0.082 L atm… · Gaseous State – General
ABC26PH0726 · According to the kinetic theory of gases, the ratio of the root mean square velocity of molecular oxygen and molecular hydrogen at 300 K is · Gaseous State – General
ABC26PH0727 · The unit of the constant ‘a’ in van der Waals equation of state of a real gas can be expressed as · Gaseous State – General
ABC26PH0729 · If the root mean square speed of hydrogen gas at a particular temperature is 1900 m s-1, then the root mean square speed of nitrogen gas at… · Gaseous State – General
ABC26PH0730 · The volume correction factor for a non-ideal gas in terms of critical pressure (pc), critical molar volume (Vc), critical temperature (Tc)… · Gaseous State – General
ABC26PH0731 · The Maxwell-Boltzmann distribution f(vx) of one-dimensional velocities vx at temperature T is [Given: A is a normalization constant such… · Gaseous State – General
ABC26PH0733 · The pH of a solution prepared from 0.005 mole of Ba(OH)2 in 100 cc water is · Ionic Equilibrium – General
ABC26PH0734 · The solubility products (Ksp) for three salts MX, MY2 and MZ3 are 1 × 10-8, 4 × 10-9 and 27 × 10-8, respectively. The solubility of these… · Ionic Equilibrium – General
ABC26PH0735 · (a) Calculate the pH of a solution obtained by mixing 50.00 mL of 0.20 M weak acid HA (Ka = 10-5) and 50.00 mL of 0.20 M NaOH at room… · Ionic Equilibrium – General
ABC26PH0736 · The pH of a 1.0 × 10-3 M solution of a weak acid HA is 4.0. The acid dissociation constant Ka is: · Ionic Equilibrium – General
ABC26PH0737 · Which one of the following species is the conjugate base of HO^-? · Ionic Equilibrium – General
ABC26PH0738 · If Ksp is the solubility product of a sparingly soluble salt A3X2, then its solubility is · Ionic Equilibrium – General
ABC26PH0739 · The pH of a 1 × 10-8 M HCl solution is close to · Ionic Equilibrium – General
ABC26PH0742 · The hydrolysis constant (Kh) of NH4Cl is 5.6 × 10-10. The concentration of H3O^+ in a 0.1 M solution of NH4Cl at equilibrium is · Ionic Equilibrium – General
ABC26PH0743 · The acid dissociation constant (Ka) for HCOOH, CH3 COOH, CH2 ClCOOH and HCN at 25° C are 1.8 × 10-4, 1.8 × 10-5, 1.4 × 10-3 and 4.8 ×… · Ionic Equilibrium – General
ABC26PH0745 · At 25°C, the solubility product (Ksp) of CaF2 in water is 3.2 × 10-11. The solubility (in mole per kg of water) of the salt at the same… · Ionic Equilibrium – General
ABC26PH0746 · The pKa values of H3PO4 are 2.12, 7.21 and 12.67. The pH of a phosphate buffer containing 0.2 M NaH2PO4 and 0.1 M Na2HPO4 is ____ · Ionic Equilibrium – General
ABC26PH0747 · At 298 K, 0.1 mol of ammonium acetate and 0.14 mol of acetic acid are dissolved in 1 L of water. The pH of the resulting solution is… · Ionic Equilibrium – General
ABC26PH0748 · The solubility of PbI2 in 0.10 M KI(aq) is ____ × 10-7 M (rounded up to two decimal places). [The solubility product, Ksp = 7.1 × 10-9] · Ionic Equilibrium – General
ABC26PH0749 · One liter of a buffer solution contains 0.004 mole of acetic acid (pKa = 4.76) and 0.4 mole of sodium acetate. The pH of the solution is… · Ionic Equilibrium – General
ABC26PH0750 · A buffer solution is prepared by mixing 0.3 M NH3 and 0.1 M NH4NO3. If Kb of NH3 is 1.6 × 10-5 at 25°C, then the pH (rounded off to one… · Ionic Equilibrium – General
ABC26PH0751 · The radioactive isotope used to locate brain tumors is · Radioactive Decay Kinetics
ABC26PH0752 · The total number of steps involved and number of beta particles emitted in the spontaneous decay of 92238 U → 82206 Pb respectively, are · Radioactive Decay Kinetics
ABC26PH0753 · For the following fusion reaction, 4 1 H → 4 He+2 beta ++2 nu + gamma the Q-value (energy of the reaction) in MeV (rounded off to one… · Fission Fusion
ABC26PH0754 · For the following system in equilibrium, CaCO3(s) ⇌ CaO(s) + CO2(g) the number of components, (C), phases (P) and degrees of freedom (F)… · Phase Equilibrium – General
ABC26PH0759 · The vapour pressures of solid and liquid chlorine are given by log e Psolid = 24 - 3900/T and log e Pliq = 18 - 2600/T where Psolid and… · Phase Equilibrium – General
ABC26PH0760 · The number of degrees of freedom in the homogeneous liquid region of a two component system with a eutectic point, at one atmosphere… · Phase Equilibrium – General
ABC26PH0761 · The number of degrees of freedom of liquid water in equilibrium with ice is · Phase Equilibrium – General
ABC26PH0764 · The carbon-oxygen bond in an organic compound absorbs electromagnetic radiation of frequency 6 × 1013 Hz. This frequency corresponds to the… · Physical Spectroscopy – General
ABC26PH0765 · The correct order of the fundamental vibrational frequencies of the following diatomic molecules is · Physical Spectroscopy – General
ABC26PH0766 · For H2 molecule, the fundamental vibrational frequency (nu e) in wavenumbers can be taken as 4400 cm-1. The zero-point energy of the… · Physical Spectroscopy – General
ABC26PH0767 · Among the following, microwave active molecule(s) is/are · Physical Spectroscopy – General
ABC26PH0768 · The forces constant for H35Cl and D35Cl are the same and both can be considered as harmonic oscillators. H35Cl has a fundamental… · Physical Spectroscopy – General
ABC26PH0772 · The wavelength for a particle (moving in a ring) is (2 pi)-1 / 2 exp (2 i phi), where phi is the polar angle. The probability of finding… · Particle In A Box
ABC26PH0773 · (a) The electronic wavefunction (psi) for hydrogen atom in the 2s state is given as psi ∝ (2 - r/(a0))exp (-r/(2a0)) Determine the most… · Particle In A Box