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For the reaction \( 2 \mathrm{~A}+\mathrm{B} \rightarrow 3 \mathrm{C}+\mathrm{D} \)
which of the following does not express the reaction rate ?
(a) \( -\frac{\mathrm{d}[\mathrm{B}]}{\mathrm{dt}} \)
(b) \( \frac{\mathrm{d}[\mathrm{D}]}{\mathrm{dt}} \)
(c) \( -\frac{1}{2} \frac{\mathrm{d}[\mathrm{A}]}{\mathrm{dt}} \)
(d) \( -\frac{1}{3} \frac{\mathrm{d}[\mathrm{C}]}{\mathrm{dt}} \)
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