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.
ABC26PH0360 · For a reaction involving two steps given below First step: G ⇌ 2H Second step: G + H → P assume that the first step attains equilibrium… · Chemical Kinetics – General
ABC26PH0361 · Consider the reaction, H2+C2H4 → C2H6 The molecular diamesters of H2 and C2H4 are 1.8 Å and 3.6 Å respectively. The pre-exponential factor… · Chemical Kinetics – General
ABC26PH0362 · Consider the reaction, 2C(s)+O2(g)⇌ 2CO(g) at equilibrium, The equilibrium can be shifted towards the forward direction by · Chemical Equilibrium – General
ABC26PH0364 · For a reaction of the type X k2k1⇌ Y, the correct rate expression is ([X]0. and [X] corresponds to the concen tration of X at time t=0 and… · Chemical Kinetics – General
ABC26PH0365 · The temperature dependence of partition are as follows: qtranslation ∝ T3/2 qvibration ∝ T0 qrotation ∝ T (linear molecule) qrotation ∝… · Statistical Thermodynamics – General
ABC26PH0370 · The rate constant of a reaction is 1.25 × 10-4 mol L-1 s-1. If the initial concentration of the reactant is 0.250 mol L-1, the total time… · Chemical Kinetics – General
ABC26PH0371 · The dependence of rate constant k on a temperature T (in K) of a reaction is given by the expression ln k = [(-5000 K)/T] + 10 The… · Chemical Kinetics – General
ABC26PH0372 · The major product obtained in the following reaction is · Chemical Kinetics – General
ABC26PH0373 · Under physiological conditions, the conversion of CO2 to bicarbonate ion by carbonic anhydrase enzyme (MW = 30,000 g mol-1) has a turnover… · Chemical Kinetics – General
ABC26PH0374 · According to Eyring state theory for a bimolecular reaction, the activated complex has · Chemical Kinetics – General
ABC26PH0378 · Consider the following two parallel irreversible first order reactions at temperature T, where k1 and k2 are the rate constants and their… · Chemical Kinetics – General
ABC26PH0379 · For an enzyme catalyzed reaction, the plot of inverse of initial rate against inverse of initial substrate concentration is linear with… · Chemical Kinetics – General
ABC26PH0380 · In a reaction, reactant X is converted to products Y and Z consecutively with rate constants 6.0 × 10-2 min-1 and 9.0 × 10-3 min-1… · Chemical Kinetics – General
ABC26PH0381 · For the ring opening reaction of cyclopropane to propene at 25°C, the pre-exponential factor is 4.3 × 1015 s-1. The entropy of activation… · Chemical Kinetics – General
ABC26PH0382 · The rate constants for the decomposition of a molecule in the presence of oxygen are 0.237 × 10-4 L mol-1 s-1 at 0°C and 2.64 × 10-4 L… · Chemical Kinetics – General
ABC26PH0383 · In the reversible chamical reaction taking place under standard condition at 298 K and 1 atm in a Daniel cell, Zn |Zn2+(aq) | |Cu2+(aq) |… · Electrochemistry – General
ABC26PH0384 · If standard emf of the cell, Cu | Cu2+(aq) | [Cu(NH3)4]2+, aq.NH3 | Cu is 0.35, then stability constant of the formation cupric amine… · Nernst Cells
ABC26PH0385 · Aqueous solution of sodium chloride (chi NaCl = 0.015) at 298 K is in equilibrium with a water vapour pressure (in torr) of · Electrochemistry – General
ABC26PH0386 · Average value of enthalpy of vaporisation (in kJ/mol) of water between 363 and 373 K is · Electrochemistry – General
ABC26PH0387 · Given the standard potential for the following half-cell reaction at 298 K Cu+(aq)+e- → Cu(s) E0=0.52 V Cu2+(aq)+e- → Cu+(aq) E0=0.16 V… · Nernst Cells
ABC26PH0388 · For a redox reaction, Cd2+ + 2e^- ⇌ Cd, the (Ep)anodic observed in cyclic voltametry at hanging mercury drop electrode is –650 mV vs. SCE… · Electrochemistry – General
ABC26PH0389 · Given that E0(Fe3+, Fe) = -0.04 V and E0(Fe2+, Fe) = -0.44 V, the value of E0(Fe3+, Fe2+) is: · Electrochemistry – General
ABC26PH0390 · In the mixture obtained by mixing 25.0 mL 1.2 × 10-3 M MnCl2 and 35.0 mL of 6.0 × 10-4 M KCl solution, the concentrations (M) of Mn2+, K^+… · Electrochemistry – General
ABC26PH0391 · The activity (M) of Mn2+ ion in the above solution is · Electrochemistry – General
ABC26PH0392 · According to the Debye – Huckel limiting law, the mean activity coefficient of 5 × 10-4 mol kg-1 aqueous solution of CaCl2 at 25°C is (the… · Debye Huckel
ABC26PH0394 · The standard reduction potentials at 298 K for single electrodes are given below: From this we can infer that · Nernst Cells
ABC26PH0395 · For a 1 molal aqueous NaCl solution, the mean ionic activity coefficient (gamma ±)and the Deby-Huckel Limiting Law constant (A) are related… · Electrochemistry – General
ABC26PH0396 · For the concentration cell M | M^+(aq, 0.01 mol dm-3) || M^+(aq, 0.1 mol dm-3) | M the EMF (E) of the cell at a temperature (T) equals · Nernst Cells
ABC26PH0397 · At 298 K, the EMF of the cell pt | H2 (1 bar) | H^+(solution) || Cl^- | Hg2Cl2 Hg is 0.7530 V. The standard potential of the calomel… · Nernst Cells
ABC26PH0398 · For the following reaction 2MnO4^- + 5H2C2O4 + 6H^+ → 2Mn2+ + 8H2O + 10CO2; E0(MnO4^-/Mn2+) = +1.51 V and E0(CO2/H2C2O4) = -0.49 V. At 298… · Electrochemistry – General
ABC26PH0399 · A sparingly soluble electrolyte M2X ionizes as M2X ⇌ 2M^+ + X2-. The solubility product (Ksp), molal solubility (S) and molal activity… · Electrochemistry – General
ABC26PH0401 · The value of log e(KSP) for Fe(OH)3 at 298 K is · Electrochemistry – General
ABC26PH0402 · A platinum electrode is immersed in a solution containing 0.1 M Fe2+ and 0.1 M Fe3+. Its potential is found to be 0.77V against SHE. Under… · Electrochemistry – General
ABC26PH0403 · Given the E0 values for the following reaction sequence, Mn6+ 1.28 V Mn5+ 2.9 V Mn4+ 0.96 Mn3+ 1.5 V Mn2+ the computed value of E0 for Mn6+… · Electrochemistry – General
ABC26PH0404 · The expression for the equilibirum constant (Keq) for the enzyme catalyzed reaction given below, is E+S k2k1⇌ ES k4k3⇌ P+E · Electrochemistry – General
ABC26PH0405 · The solubility product of AgBr(s) is 5 × 10-13 at 298 K. If the standard reduction potential of the half-cell, E0Ag|AgBr(s)|Br^- is 0.07 V… · Electrochemistry – General
ABC26PH0412 · The temperature derivative of electrochemical potential E at constant pressure, ((∂ E)/(∂ T))P is given by · Electrochemistry – General
ABC26PH0416 · The activity of ' m ' molal CuSO4 solution can be expressed in terms of its mean activity coefficient (gamma ±)as: · Electrochemistry – General
ABC26PH0417 · At 25°C, the emf (in volts, rounded off to three decimal places) of the cell, Ag|AgBr(s)|Br^-(a=0.20), Cu2+(a=0.48), Cu^+(a=0.24)|Pt is… · Nernst Cells
ABC26PH0418 · The CORRECT ‘voltage (E) versus time’ excitation signal used in cyclic voltammetry is · Polarography Voltammetry
ABC26PH0419 · In an electrochemical cell, Ag^+ ions in AgNO3 are reduced to Ag metal at the cathode and Cu is oxidized to Cu2+ at the anode. A current of… · Electrochemistry – General
ABC26PH0424 · The triple point for water is · Equilibria – General
ABC26PH0429 · 40 millimoles of NaOH are added to 100 mL of a 1.2 M HA and Y M NaA buffer resulting in a solution of pH 5.30. Assuming that the volume of… · Equilibria – General
ABC26PH0430 · The number of degrees of freedom for a system consisting of NaCl(s), Na^+(aq) and Cl^-(aq) at equilibrium is · Equilibria – General
ABC26PH0431 · For a one component system, the maximum number of phases that can coexist at equilibrium is · Equilibria – General
ABC26PH0432 · The number of degrees of freedom of a system consisting of solid sucrose in equilibrium with an aqueous solution of sucrose is · Equilibria – General
ABC26PH0433 · Among the following, the equilibrium which is NOT affected by an increase in pressure is · Equilibria – General
ABC26PH0435 · Sulfur can exist in four phases. The possible number of triple points is · Equilibria – General
ABC26PH0436 · For the pair of reactions given below (i) N2(g) + 3H2(g) ⇌ 2NH3(g) (ii) 1/2N2(g) + 3/2H2(g) ⇌ NH3(g) If at a particular temperature, KP1… · Equilibria – General
ABC26PH0437 · On On the pressure-temperature diagram for a one-component system, the point where the solid-liquid and the liquid-gas curves intersect is: · Equilibria – General