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Free Online Mock Chemistry Multiple Choice Test on Chemical Kinetics
Sub Category : Chemical Kinetics Test : 17 Time Left :
1) The rate constant k, for the reaction,N2O5(g)->2 N2(g) + 1/2 O2(g) is 2.3 × 10-2s-1, Which equation given below describes the change of [N2O5] with time?, [N2O5]0 and [N2O5]t is conc. of N2O5 initially and at time t.(1) [N2O5]t = [N2O5]0 + kt (2) [N2O5] = [N2O5]t = ekt,(3) log [N2O5]t = log10 [N2O5]0 – kt (4) In [N2O5]0/[N2O5]t = kt,
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2) The rate of a first order reaction is 1.5 × 10-2 mol L-1 min-1 at 0.5 M conc. of reaction t. The half life of reaction is(1) 0.383 min (2) 23.1 min (3) 8.73 min (4) 7.53 min
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3) For a first order reaction A->B the reaction rate at reactant concentration of 0.01M is found to be 2.0×10power-5 mol Lpower-1 spower-1. The half life period of the reaction is:(1) 30 s (2) 220 s (3) 300 s (4) 347s
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4) The rate of reaction between two reactants A and B decreases by a factor of 4 if the concentration of reactant B is doubled. The order of this reaction with respect of reactant B is:
(1) 2 (2)-2 (3)1 (4) -1
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5) Consider an endothermic reaction, X -> Y with activation energies Eb and Ef for the backward and forward reactions, respectively. In general(1) There is no definite relation between Eb and Ef (2) Eb = Ef (3) Eb > Ef(4) Eb less than Ef
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