Which of the following expression is correct for zero order and first order respectively[where a...

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Which of the following expression is correct for zero order and first order respectively[where a is initial concentration]?
(a) \( \mathrm{t}_{1 / 2} \propto \mathrm{a} ; \mathrm{t}_{1 / 2} \propto \frac{1}{\mathrm{a}} \)
(b) \( \mathrm{t}_{1 / 2} \propto \mathrm{a} ; \mathrm{t}_{1 / 2} \propto \mathrm{a}^{0} \)
(c) \( \mathrm{t}_{1 / 2} \propto \mathrm{a}^{0} ; \mathrm{t}_{1 / 2} \propto \mathrm{a} \)
(d) \( \mathrm{t}_{1 / 2} \propto \mathrm{a}^{0} ; \mathrm{t}_{1 / 2} \propto \frac{1}{\mathrm{a}^{2}} \)
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