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Question

The time for half-life period of a certain reaction Aproducts is 1 hour. When the initial concentration of the reactant A is 2.0 mol L1, how much time does it take for its concentration to come from 0.50 to 0.25 mol L1 if it is a zero-order reaction?

A
4 hr
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B
0.5 hr
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C
0.25 hr
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D
1 hr
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Solution

The correct option is C 0.25 hr
For zero order reaction k=xt(1)
Where x=amount decomposed
For a zero order reaction,
k=[A]02t1/2
k=22×1=1
Since,[A]0=2 M,t1/2=1 hr;k=1
From equation (1),
t=0.251=0.25 hr

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