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Free Online Mock Chemistry Multiple Choice Test on Chemical Kinetics
Sub Category : Chemical Kinetics Test : 19 Time Left :
1) The rate constant for the reaction 2N2O5->4NO2+O2 is 3.0 × 10-5sec-1. If the rate is 2.4×10-5 mol liter-1 sec-1, then the concentration of N2O5 (in mol litre-1) is(1) 1.4 (2) 1.2 (3) 0.04 (4) 0.8
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2)When two reactant A and B are mixed to give products C and D, the reaction quotient Q at the initial stages of the reaction
(1) is zero (2) decreases with time (3) is independent of time (4) increases with time
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3) If ‘I’ is the intensity of absorbed light and ‘C’ is the concentration of AB for the photochemical process AB + hv->AB*, the rate of formation of AB* is directly proportional to(1) C (2) I (3) I² (4) CI
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4) Consider the chemical reaction, N2(g) + 3H2(g)-> 2NH(g). The rate of this reaction can be expressed in terms of time derivative of concentration of N2(g), H2(g) or NH3(g). Identify the correct relationship amongst the rate expressions.(1) Rate = -d[N2]/dt= -1/3d[H2]/dt = 1/2d[NH3]/dt (2) Rate = -d[N2]/dt= -3d[H2]/dt = 2d[NH3]/dt (3) Rate = d[N2]/dt= 1/3d[H2]/dt = 1/2d[NH3]/dt (4) Rate = d[N2]/dt= -d[H2]/dt = d[NH3]/dt
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5) In a first order reaction the concentration of reactant decreases from 800 mol/dm3 in 2 × 104 sec. The rate constant of reaction is sec-1 is(1) 2 × 104 (2) 3.45×10-5 (3) 1.386×10-4 (4) 2×10-4
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