489 questions from a source that prints this span of years rather than the year of each question. Each opens with its answer and explanation.
ABC26PH0439 · The enthalpy of fusion of ice at 273K is 6.01 kJ mol-1 and the enthalpy of vaporization of water at 273K is 44.83 kJ mol-1. The enthalpy of… · Equilibria – General
ABC26PH0441 · m1 and m2 are the slopes (dP/dT) of the solid – liquid equilibrium lines in the P – T phase diagrams of H2O and CO2, respectively. For P <… · Equilibria – General
ABC26PH0442 · The enthalpy of vaporization of a liquid at its boiling point (Tb = 200 K) is 15.3 kJ mol-1. If the molar volumes of the liquid and the… · Equilibria – General
ABC26PH0443 · Consider the following phase diagram of CO2 (not to scale). At equilibrium, the INCORRECT statement is: · Equilibria – General
ABC26PH0444 · The equilibrium constant for the reaction (a) NO(g) ⇌ N2O(g)+NO2(g) at 25°C is closest to: [ Delta Go=-104.18 kJ; R=8.314 J mol-1 K-1] · Equilibria – General
ABC26PH0445 · The reaction CO(g) + Cl2(g) ⇌ COCl2(g) at 500°C, with initial pressures of 0.7 bar of CO and 1.0 bar of Cl2, is allowed to reach… · Equilibria – General
ABC26PH0447 · As per the kinetic theory of ideal gases, which of the following statements is NOT correct? · Gaseous State – General
ABC26PH0449 · One mole each of H2CO3, and Na2CO3 are added to water to prepare one litre solution. The pH of the solution is. · Gaseous State – General
ABC26PH0450 · One mole each of acetic acid and sodium acetate are dissolved in 1kg of water. Boiling point of the resulting solution is · Gaseous State – General
ABC26PH0451 · Approximately one hydrogen atom per cubic meter is present in interstellar space. Assuming that the H - atom has a diameter of 10-10 m, the… · Gaseous State – General
ABC26PH0452 · For 1 mole of a monoatomic ideal gas, the relation between pressure (p), volume (V) and average molecular kinetic energy (varepsilon) is · Gaseous State – General
ABC26PH0453 · A 2 L vessel containing 2 g of H2 gas at 27°C is connected to a 2 L vessel containing 176 g of CO2 gas at 27°C. Assuming ideal behaviour of… · Gaseous State – General
ABC26PH0454 · At a given temperature and pressure, the ratio of the average speed of hydrogen gas to that of helium gas is approximately ____ · Gaseous State – General
ABC26PH0455 · A molecule has a 2-fold axis and a mirror plane perpendicular to that. The point group must have a · Symmetry Elements Point Groups
ABC26PH0456 · The symmetry elements that are present in BF3 are · Symmetry Elements Point Groups
ABC26PH0457 · The S2 operation on a molecule with the axis of rotation as the z axis, moves a nucleus at (x, y, z) to · Group Theory – General
ABC26PH0461 · The point group of NSF3 is: · Symmetry Elements Point Groups
ABC26PH0462 · The Td point group has 24 elements and 5 classes. Given that it has two 3 - dimensional irreducible representa tion, the number of one… · Character Tables
ABC26PH0463 · The point group of ClF3 molecule and its corresponding number of irreducible representation are respectively. · Character Tables
ABC26PH0464 · Symmetry operations of the four C2 axes perpendicular to the principle axis belong to the same class in the point group (s) · Symmetry Elements Point Groups
ABC26PH0465 · The point group symmetryof CH2=C=CH2 is · Symmetry Elements Point Groups
ABC26PH0466 · Conversion of boron trifluoride to tetrafluoroborate accompanies · Group Theory – General
ABC26PH0467 · The number of C2 axes in CCl4 is __________ GATE 2020 · Group Theory – General
ABC26PH0468 · The character table for a pyramidal AB3 molecule of C3 v point group is given below: The reducible representation of pyramidal AB3 is The… · Reducible Representations
ABC26PH0470 · A gaseous sample on exposure to total radiant energy of 6.626 J at 300 nm results in the photodissociation of 10-3 mol of this sample… · Chemical Kinetics – General
ABC26PH0471 · A reaction follows second order rate law, -d[A]/dt = k[A]2, if · Chemical Kinetics – General
ABC26PH0472 · Consider an exothermic reaction A k-1k1⇌ I as the temperature increases · Chemical Kinetics – General
ABC26PH0473 · One gram of 90 Sr gets converted to 0.953 g after 2 years. The half life of 90 Sr, and the amount of 90 Sr remaining after 5 years are · Chemical Kinetics – General
ABC26PH0474 · A reaction proceeds through the formation of an intermediate B in an unimolecular reaction A ka B kb C The integrated rate law for this… · Chemical Kinetics – General
ABC26PH0476 · A solution containing 47 ppm of a compound X (FW 225) has a transmittance of 29.7% in a 1.5 cm cell at 400 nm. The molar absorptivity in L… · Photochemistry – General
ABC26PH0477 · The percent transmittance of 8 × 10-5 M solution of KMnO4 is 39. when measured at 510 nm in a cell of path length of 1cm. The absorbance… · Photochemistry – General
ABC26PH0479 · A solution containing a metal complex absorbs at 480 nm with molar extinction coefficient of 15,000 L mol-1 cm-1. If the path length of the… · Photochemistry – General
ABC26PH0480 · Fluorescence quantum yield and fluorescence lifetime of a molecule are 0.4 and 5 × 10-9 s, respectively. If the fluorescence decay rate… · Photochemistry – General
ABC26PH0482 · The molar absorption coefficient of a substance dissolved in cyclohexane is 1710 L mol-1 cm-1 at 500 nm. The reduction in intensity of… · Photochemistry – General
ABC26PH0484 · In Freundlich isotherm, a linear relationship is obtained in the plot of (theta = surface coverage and p = partial pressure of the gas) · Surface Chemistry – General
ABC26PH0485 · Adsorption of N2 on TiO2 was carried out at 75 K. A plot of z/((1-z)V) versus z (z = p/p0) gives a straight line with an intercept, 4.0 ×… · Surface Chemistry – General
ABC26PH0487 · A plot of osmotic pressure against concentration (gL-1) of a polymer is constructed. The slope of the plot · Physical Spectroscopy – General
ABC26PH0488 · Out of the following, the one which is not an excitation source for IR spectrometer is · Physical Spectroscopy – General
ABC26PH0489 · The zero-point energy of the vibration of 35Cl2 mimicking a harmonic oscillator with a force constant k = 2293.8 N m-1 is · Physical Spectroscopy – General
ABC26PH0490 · The molecular active in rotational microwave, infrared absorption as well as rotational Raman spectra is: · Physical Spectroscopy – General
ABC26PH0491 · The selection rules for the appearance, of P branch in the rotational - vibrational absorption spectra of a diatomic molecule within rigid… · Physical Spectroscopy – General
ABC26PH0492 · The rotational constant for CO in the ground and the first excited vibrational states are 1.9 and 1.6 cm-1, respectively. The% change in… · Physical Spectroscopy – General
ABC26PH0494 · The anharmonicity constant (cm-1) of the diatomic molecule is: · Physical Spectroscopy – General
ABC26PH0496 · The rotational Raman spectrum of 19F2 shows a series of Stokes lines at 19230.769 cm-1, 19227.238 cm-1 and 19223.707 cm-1. The rotational… · Physical Spectroscopy – General
ABC26PH0497 · The most populated rotational state for HCl (B = 8.5 cm-1) at 300 K is: · Physical Spectroscopy – General
ABC26PH0498 · The ratio of life times of two states that gives rise to line widths of 1.0 cm-1 and 0.2 cm-1 respectively is: · Physical Spectroscopy – General
ABC26PH0499 · The region of electromagnetic spectrum employed in the electron spin resonance (ESR) spectroscopy is: · Physical Spectroscopy – General
ABC26PH0500 · The point group symmetry of the given planar shape is: · Physical Spectroscopy – General
ABC26PH0502 · The frequency of radiation (in cm-1 units) required to rotationally excite the molecule from J = 0 to J = 1 state is · Physical Spectroscopy – General
ABC26PH0503 · The bond that gives the most intense band in the infrared spectrum for its stretching vibrations is · Physical Spectroscopy – General