The reactin `2X to B` is a zeroth order reaction. If the initial concentration of X is 0.2 M, the half-life is 3h. When the initial concentration of X is 0.5 M, the time required to reach its final concentration of 0.2 M will be:
A
`9.0h`
B
`12.0 h`
C
`18.0 h`
D
`7.2 h`
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