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# Please help! When initial concentration of the reactant is doubled, the half-life period of a zero order reaction

When initial concentration of the reactant is doubled, the half-life period of a zero order reaction

• Option 1)

is tripled

• Option 2)

is doubled

• Option 3)

is halved

• Option 4)

remains unchanged

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As we learnt that

Zero Order Reaction -

Zero order reaction means that the rate of the reaction is proportional to zeroth power of the concentration of reactants

- wherein

$R\rightarrow P$

$Rate=\frac{-d(R)}{dt}=K[R]^{0}=K$

$t_\frac {1}{2}=$ time required for half completion of reaction$=\frac{a}{2k}$

$\left ( t_{\frac{1}{2}} \right )_{zero} = \frac{\left [ A \right ]_{o}}{2k}$

$\therefore$ If [A]o is doubled then $t_{\frac{1}{2}}$ also doubled.

Option 1)

is tripled

This is incorrect.

Option 2)

is doubled

This is correct.

Option 3)

is halved

This is incorrect.

Option 4)

remains unchanged

This is incorrect.

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