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#10 | Problems on 1st Order Reaction (Type 3)
(Chemistry) > Chemical Kinetics
Related Practice Questions :

A first order reaction has a specific reaction rate of 10-2s-1. How much time will it take for 20 g of the reactant to reduce to 5 g?

(a) 238.6 s      (b) 138.6 s        (c) 346.5  s        (d) 693.0 s

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If 60% of a first order reaction was completed in 60 min, 50% of the same reaction would be completed in approximately.

(a) 50 min
(b) 45 min
(c) 60 min
(d) 40 min

(log 4=0.60, log 5=0.69)

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A first order reaction takes 40 min for 30% decomposition.Calculate ${t}_{1/2}$

(A) 77.7 min.

(B) 27.2 min.

(C) 55.3 min.

(D) 67.3 min.

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Half life period for a first order reaction is 20 minutes. How much time is required to change the concentration of the reactants from 0.08 M to 0.01M

(A) 20 minutes

(B) 60 minutes

(C) 40 minutes

(D) 50 minutes

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The gas phase decomposition  fol- lows the first order rate law.$se{c}^{-1}$. The initialpressure of ${N}_{2}{O}_{5}$is 0.1 atm. The time of decomposition of ${N}_{2}{O}_{5}$so that the total pressure becomes 0.15 atm will be-

(A) 54 sec

(B) 5.4 sec

(C) 3.45 sec

(D)34.55 sec