235 questions from a source that prints this span of years rather than the year of each question. Each opens with its answer and explanation.
ABC26PH0681 · 1 10-6 moles of the enzyme carbonic anhyrase dehydrates H2 CO3 to produce 0.6 mol of CO2 per second. The turnover number of the enzyme is: · Enzyme Kinetics
ABC26PH0682 · The rate of a chemical reaction doubles when the temperature is changed from 300 K to 310 K . Calculate activation energy in kJ mol-1 · Arrhenius Activation
ABC26PH0683 · For a reaction with rate equation -dC / dt=kC2, C0 and C are the concentrations of the reactant at time 0 and t respectively. If 10 minutes… · Chemical Kinetics – General
ABC26PH0684 · An enzyme following Michaelis-Menten kinetics was found to have highest activity at 37 C and pH 7.0 . If the maximum velocity V for this… · Enzyme Kinetics
ABC26PH0685 · Ozone seems to be formed in the atmosphere through the photolysis of diatomic molecule: arrayl O2 [h]k0 2O \\ O + O2 k1 O3 \\ O3 + O k2 2O2… · Rate Laws Order
ABC26PH0686 · From the reaction aA products, the plot of 1/([A]) versus time (t) gives a straight line. Order of the reaction is · Chemical Kinetics – General
ABC26PH0687 · The rate constant k for a second order reaction P + Q Products is expressed 10k = 20 - 3000/T, where the concentration is in mol\,lit-1, T… · Rate Laws Order
ABC26PH0688 · Given that E_Fe2+ / Feo=-0.44 V and E_Fe3+ / Fe2+o=0.77 V, the E_Fe3+ / Feo is : · Electrochemistry – General
ABC26PH0689 · The statement that is correct for both electrochemical (galvanic) cells and electrolytic cell is : · Nernst Cells
ABC26PH0690 · The standard potential of a Daniel cell is +1.10 V and the equilibrium constant for the cell reaction is 1.5 1037. It can be concluded that · Nernst Cells
ABC26PH0691 · Consider the following redox system. Q+2 H++2 e- QH2 E =0.699 V Calculate the pH of the solution at 298 K , if the redox potential of the… · Electrochemistry – General
ABC26PH0692 · The Zn2+ Zn half cell (E = -0.762\,V) is connected to a Cu2+ Cu half cell (E = 0.340\,V). What is the value of E for spontaneous conversion… · Electrochemistry – General
ABC26PH0693 · For a cell reaction, E\,(at\ 25) = 1.26\,V, n=2 and = -96.5\,J\,K-1\,mol-1. Calculate E at 85 by assuming to be independent of temperature… · Nernst Cells
ABC26PH0694 · The molality of (NH4)2SO4 solution that has the same ionic strength as 1\,mol\,kg-1 solution of KCl is · Debye Huckel
ABC26PH0695 · A concentration cell with two hydrogen electrodes at two different pressures is depicted as H2(g)(Pt)\;\; pH2=p1 \;|\; HCl(aq) \;|\… · Electrochemistry – General
ABC26PH0696 · MnO4-(aq)+Zn(s)+H3 O+(aq) Mn2+(aq)+Zn2+(aq)+H2 O(l) For the above reaction if the equilibrium constant at 298 K is represented by 10x, then… · Electrochemistry – General
ABC26PH0697 · The concentration of K+ion inside a biological cell is 20 times higher than outside. The magnitude of potential difference between the two… · Electrochemistry – General
ABC26PH0698 · The standard reduction potentials of the Fe3+ / Fe2+ and Fe2+ / Fe couples are 0.77 and -0.44 V , respectively. The standard reduction… · Electrochemistry – General
ABC26PH0699 · An electrochemical cell consists of two half-cell reactions arrayl AgCl(s) + e- Ag(s) + Cl-(aq) \\ Cu(s) Cu2+(aq) + 2e- array The mass of… · Nernst Cells
ABC26PH0700 · For a cell reaction, Pb(s)+Hg2 Cl2(s) PbCl2(s)+2 Hg(l), (( E)/( T) )P is 1.45 10-4 VK-1. The entropy change (in J mol-1 K-1 ) for the… · Nernst Cells
ABC26PH0701 · The standard reduction potentials of Ce4+ / Ce3+ and Fe3+ / Fe2+ are 1.44 and 0.77 V , respectively. The 10 K ( K is the equilibrium… · Electrochemistry – General
ABC26PH0702 · The emf of a standard cadmium cell is 1.02 V at 300 K. The temperature coefficient of the cell is -5.0 10-5\,V\,K-1. [1\,F =… · Nernst Cells
ABC26PH0703 · The limiting molar conductivity of La3+ and Cl-ions in aqueous medium at 298 K are 209.10 10-4 and 76.35 10-4 S m2 mol-1, respectively. The… · Conductance
ABC26PH0704 · The mean ionic activity coefficient for a 0.01 M aqueous solution of Ca3(PO4)2 is ____ (Round off to three decimal places) (Given: 10 =… · Electrochemistry – General
ABC26PH0705 · For the reaction, CuSO4(aq) + Zn(s) ZnSO4(aq) + Cu(s), the value of Delta G (in kJ\,mol-1) is ____ (Round off to the nearest integer)… · Electrochemistry – General
ABC26PH0706 · The mean ionic activity coefficient of 0.004 molal CaCl2 in water at 298 K (rounded off to three decimal places) is ____. (Given… · Debye Huckel
ABC26PH0707 · For the distribution of molecular velocities of gases, identify the correct order from following (where vmp, vav, v_ rms are the most… · Gaseous State – General
ABC26PH0708 · The molar heat capacity at constant volume of a colourless gas is found to be 25 J mol-1 K-1 at room temperature. The gas must be · Gaseous State – General
ABC26PH0709 · The Maxwell distribution function for the distribution of speeds of molecules in gaseous systems is given by f(c) = 4 pi (m/(2 pi kT) )3/2… · Gaseous State – General
ABC26PH0710 · Given that the most probable speed of oxygen gas is 1000 ms-1, the mean/average speed (ms-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 · (i) Write the expression for the vibrational contribution to the total energy of CH4(g) at 500 K. All the vibrational modes are active at… · 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) )3/2 (-mv22kT ) 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 H2 O(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)+4 H+(aq)+2 NO3 -(aq) 2 NO2(g)+Cu2+(aq)+2 H2 O(l) In the above reaction at 1 atm and 298 K, if 6.36 g of copper is used. Assuming… · 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 ____ gL-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
ABC26PH0728 · The Maxwell distribution of speeds of a gas at 300 K is given below. The molar mass (in g mol-1 ) of this gas is ____ (Round off to one… · 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