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Free Online Mock Chemistry Multiple Choice Test on Chemical kinetics
Sub Category : Chemical kinetics Test : 12 Time Left :
1) For the first order reaction, half-life is 14 s. The time required for the initial concentration to reduce to 1/8th of its value is (1) 28 s (2) 42 s (3) (14)3 (4) (14)2 s.
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2)In the first order reaction the concentration of the reactants is reduced to 25% in one hour. The half-life period of the reaction
(1) 2 hr (2) 4 hr (3) 1/2 hr (4) 1/4 hr
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3) The half-life period of the first order reaction PCl5->PCl3 + Cl2 is 10 minutes. The time in which the concentration of PCl5 would be reduced to 10% of the original concentration will be (1) 26 minutes (2) 33 minutes (3) 71 minutes (4) 90 minutes.
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4) The half-life period of a first order reaction is 15 minutes. The amount of substance left after one hour will be
(1) one-half (2) one-fourth (3) one-eighth (4) one-sixteenth.
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5)The half-life of a first order reaction is 10 min. If initial amount is 0.08 mol/litre and concentration at some instant is 0.01 mol/litre, then t=
(1) 10 min (2) 30 min (3) 20 min (4) 40 min
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