ABC26PH0897 · A radioisotope 41 Ar initially decays at the rate of 34, 500 disintegrations/minute, but decay rate falls to 21, 500 disintegrations/minute… · JUNE 2013self-practice
ABC26PH0673 · The percent transmittance of a solution having absorbance (optical density) 1.0 is · 2001-2022
ABC26PH0899 · The concentrations of a species A undergoing the reaction A → P is 1.0, 0.5, 0.33, 0.25 mol dm -3 at t=0,1,2 and 3 seconds, respectively… · JUNE 2013self-practice
ABC26PH0023 · In the Lindemann mechanism of unimolecular reactions, the observed order at low concentration is: · DEC 2012self-practice
ABC26PH0675 · (a) For the reaction R P, the plot of [R] versus time (t) gives a straight line with a negative slope. The half life for the reaction is 3… · 2001-2022self-practice
ABC26PH0900 · In the Lindemann mechanism of unimolecular reactions, the observed order at lowconcentration is: · JUNE 2013self-practice
ABC26PH0024 · A bacterial colony grows most commonly by cell division. The change in the population due to cell division in an actively growing colony is… · DEC 2012self-practice
ABC26PH0901 · A bacterial colony grows most commonly by cell division. The change in the population due to cell division in an actively growing colony is… · JUNE 2013self-practice
ABC26PH0903 · A 0.1 M solution of compound A shows 50 \% transmittance when a cell of 1 cm width is used at lambda nm. Another 0.1 M solution of compound… · JUNE 2013self-practice
ABC26PH0904 · A chemical reaction involving nonlinear molecule + nonlinear molecule ⇋nonlinear activated complex .The number of vibrational degrees of… · JUNE 2013self-practice
ABC26PH0028 · In the reaction between NO and H2 the following data are obtained Experiment I: PH2 constant Experiment II : PNO = constant The orders with… · DEC 2013self-practice
ABC26PH0907 · In the reaction between NO and H2 the following data are obtained Experiment I: P_H2 constant Experiment II : PNO= constant The orders with… · DEC 2013self-practice
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… · 2001-2022self-practice
ABC26PH0686 · From the reaction aA products, the plot of 1/([A]) versus time (t) gives a straight line. Order of the reaction is · 2001-2022self-practice
ABC26PH0916 · Which of the following will result in deviation from Beer's law ? 1. Change in refractive index or medium. 2. Dissociation of analyte on… · DEC 2014self-practice
ABC26PH0034 · For a reaction, 2 A+B 3 Z, if the rate of consumption of A is 2 10-4 mol dm-3 s-1 the rate of formation of Z (in mol ~ dm-3 s-1 ) will be · JUNE 2015self-practice
ABC26PH0918 · For a reaction, 2 A+B 3 Z, if the rate of consumption of A is 2 10-4 mol dm-3 s-1 the rate of formation of Z (in mol dm-3 s-1 ) will be · JUNE 2015self-practice
ABC26PH0035 · The equilibrium constants for the reactions CH4(g)+2H2O(g) CO2(g)+4H2(g) and CO(g)+H2O(g) CO2(g)+H2(g) are K1 and K2, respectively. The… · DEC 2019
ABC26PH0919 · For a given ionic strength, (I) rate of reaction is given by kk0=-4 0.51 I1 / 2. Which of the following reactions follows the above… · JUNE 2015self-practice
ABC26PH0920 · The intensity of a light beam decreases by 50\% when it passes through a sample of 1.0 cm path length. The percentage of transmission of… · JUNE 2015self-practice
ABC26PH0036 · Considering the following parameters with reference to the fluorescence of a solution : 1. Molar absorptivity of fluorescent molecule. 2… · JUNE 2015
ABC26PH0921 · Considering the following parameters with reference to the fluorescence of a solution: 1. Molar absorptivity of fluorescent molecule. 2… · JUNE 2015self-practice
ABC26PH0037 · In a photochemical reaction, radicals formed according to the equation arrayl C4H10 + h 2\,C2H5 \\ C2H5 + C2H5 k2 C2H6 + C2H4 array If I is… · JUNE 2015
ABC26PH0923 · In a photochemical reaction, radicals formed according to the equation arrayl C4 H10+hv 2 C2 H5 \\ C2 H5+C2 H5 k2 C2 H6+C2 H4 array If I is… · JUNE 2015self-practice
ABC26PH0038 · For the following reaction, A k-1k1 2\,B \ ; B k2 C (d[B])/dt is given by · DEC 2015self-practice
ABC26PH0924 · For the following reaction, A k-1k1 2 B ; B k2 C (d[B])/dt is given by · JUNE 2015self-practice
ABC26PH0925 · According to the transition state theory, one of the vibrations in the activated complex is a loose vibration. The partition function for… · DEC 2015self-practice
ABC26PH0928 · The concentration of a reactant R varies with time for two different reactions as shown in the following plots : The orders of these two… · DEC 2015self-practice
ABC26PH0041 · According to the transition state theory, the plot with slope equal to Delta HR is · DEC 2016
ABC26PH0935 · According to the transition state theory, the plot with slope equal to Delta H+R is · DEC 2016self-practice
ABC26PH0940 · In kinetic study of a chemical reaction, slopes are drawn at different times in the plot of concentration of reactants versus time. The… · JUNE 2017self-practice
ABC26PH0941 · Photochemical decomposition of HI takes place with the following mechanism arrayl HI+hv (Ia ) H+I \\ H+HI k1 H2+I \\ I+I+M k2 I2+M array… · JUNE 2017self-practice
ABC26PH0950 · For a second-order reaction, the straight line among the following plots is · JUNE 2018self-practice
ABC26PH0046 · Photochemistry of a molecule, M, is described as by the mechanism The intercept at [Q]=0 is 4 for the inverse of fluorescence intensity… · JUNE 2019
ABC26PH0047 · The oxidation of NO to NO2 occurs via the mechanism given below. arrayl 2\,NO k-1k1 N2O2 \\ N2O2+O2 k2 2\,NO2 array (d[NO2])/dt in the… · DEC 2019
ABC26PH0048 · Substance 'A' is exposed to 600\,nm, 100\,W light source for 6626\,s, with 50\% of the incident light being absorbed. 'A' decomposes… · DEC 2019
Complex Reactions
ABC26PH0651 · A dilute solution prepared by dissolving a nonvolatile solute in one liter water shows a depression in freezing point of 0.186 K . This… · 2001-2022self-practice
ABC26PH0949 · Difference between-activation energies of the reverse and forward steps of a reversible reaction is 9.212 RT . If the pre-exponential… · JUNE 2018self-practice
Enzyme Kinetics
ABC26PH0883 · For an enzyme catalyzed reaction, a Lineweaver-Burk plot gave the following data: slope =40 s, intercept =4 (mmol dm-3 s-1 )-1. If the… · JUNE 2011self-practice
ABC26PH0887 · In the Michaelis-Menten mechanism for enzyme kinetics, the expression obtained is: v[E]0[S]=1.4 1012-104 v[E]0 The values of k3 (K_ ems… · JUNE 2012self-practice
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: · 2001-2022self-practice
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… · 2001-2022self-practice
ABC26PH0909 · In the Lineweaver-Burk plot of (initial rate) -1 vs. (initial substrate concentration) -1 for an enzyme catalysed reaction following… · JUNE 2014self-practice
ABC26PH0030 · For an enzyme-substrate reaction, a plot between 1/v and 1/([S0]) yields a slope of 40\,s. If the enzyme concentration is 2.5\,, then the… · DEC 2014
ABC26PH0912 · For an enzyme-substrate reaction, a plot between 1 / v and 1 / [S0 ] yields a slope of 40 s . If the enzyme concentration is 2.5 mu M, then… · DEC 2014self-practice
ABC26PH0926 · v and Km for an enzyme catalyzed reaction are 2.0 10-3 Ms-1 and 1.0 10-6 M, respectively. The rate of the reaction when the substrate… · DEC 2015self-practice
ABC26PH0942 · In a enzyme catalyzed reaction: E+S k-1k1 ES k2 E+P k2=3.42 104 s-1. If [E]0=1.0 10-2 mol dm-3, the magnitude of maximum velocity and… · JUNE 2017self-practice
ABC26PH0044 · The slope and intercept obtained from (1/Rate) against (1/substrate concentration) of an enzyme catalyzed reaction are 300 and 2 105… · DEC 2017self-practice
ABC26PH0945 · The slope and intercept obtained from (1/Rate) against (1/substrate concentration) of an enzyme catalyzed reaction are 300 and 2 105… · DEC 2017self-practice
ABC26PH0045 · For an enzyme-substrate reaction, arrayc E+S k1k-1 E S E S k2 E+P, array the slope and intercept of plot between 1/r and 1/([s]) are 10-2 s… · JUNE 2018self-practice