Chemical Kinetics English Chemical Kinetics English 1 / 24A catalyst is a substance which – Increase the equilibrium concentration of the product Changes the equilibrium constant of reaction Shortens the time to reach equilibrium Supplies energy to the reaction 2 / 24For a zero order reaction – t1/2 ∝ a t1/2∝1/a t1/2 ∝ a2 t1/2∝1/a2 3 / 24The rate at which a substance reacts, depends upon its Atomic Equivalent mass Molecular Active mass 4 / 24t1/2 for first order reaction is – 0.6/K 0.693/2K 0.683/K 0.10/K 5 / 24The rate of a reaction A+B ----Products is given by the equation r=k [A] [B]. If B is taken in large excess the order of reaction will be : 2 1 0 unprediclable 6 / 24The rate of velocity of first order reaction is 10-2 minutes. What will be half life period ? 693 minutes 69.3 minutes 6.93 minutes 0.693 minutes 7 / 24The unit of rate constant of 1st order reaction is – Time-1 Mole liter-1 sec-1 Litre mole-1 sec-1 Litremole-1 sec 8 / 24The effect of temperature on rate of reaction is shown by – Kirchhoff’s equations Arrhenius equation Gibb’s Helmholtz Clausius-Clapeyron equation 9 / 24Time takn for the 100% completion of a zero order reaction is- ak a/2K a/K 2k/a 10 / 24For a reaction, t1/2 = 1/k . the order of reaction is – 1 0 3 2 11 / 24The unit of rate constant for zero order reaction is – molL-1 s-1 L mol-1 s-1 L2mol-2s-1 s-1 12 / 24For which order half life period is independent of intial concentration ? Zero First Second Third 13 / 24The unit of rate and rate constant of a reaction is the same. The order of reaction is – Second order first order zero order third order 14 / 24The unit of rate constant of the reaction 2H2O+ O2 is – Sec-1 L mol-2 sec-2 L-1mol-1sec-1 molL-1sec-1 15 / 24If the rate of a reaction is expressed by rate = K[A]2 [B], then order of reaction will be 2 3 1 0 16 / 24The order of reaction H2 (g) + Cl2 (g) ---- 2HCl in water is – 3 2 1 0 17 / 24For a relation 3A É2B, the rate of reaction is equal to – -3 /2 d [A]/dt - (2 )/3 (d [A])/dt -1/b (d [A])/dt +d [A]/dt 18 / 24For a reaction of the type : aA + bB É Product; is a reaction of – -d [B]/dt - d /d d [B]/dt - a /b x d [B]/dt - b /b x d [B]/dt 19 / 24Consider the reaction N2 (g) + 3H2 (g) ⥩ 2NH3(g). The equality relationship between A and is – d [NH3])/dt = (d [H2])/dt (d [NH3])/dt = - 1/3 (d [H2])/dt (d [NH3])/dt =- 2/3 (d [H2])/dt (d [NH3])/dt = - 3/2 (d [NH3])/dt 20 / 24Which of the following does not show rate of reaction for the 2A + B É 3C +D reaction . –d [A]/2dt +d [C]/3dt –d [B]/dt –d [D]/dt 21 / 24A solution of intial concentration “a mol dm-3” follows first order kinetic. The time taken for the completion of reaction is – k/a a/2k a/k 2k/a 22 / 24The velocity r = k [H2O2] is for the reaction 2H2O2É2H2O+O2 Zero order reaction first order reaction second order reaction third order reaction 23 / 24The unit of specific rate of second order reaction is – Sec-1 mol-1 sec-1 L-2 mol2sec-1 L mol-1sec-1 24 / 24In reaction AÉB follows 2nd order kinetic. When the concentration of A is doubled, then times with of B will be – 2 ½ 4 ¼ Your score isThe average score is 63% 0% Restart quiz