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For the reaction P rarr Q rate of the re...

For the reaction `P rarr Q` rate of the reaction is expressed by `-dp/dtor+dQ/dt`. What is the significance of plus and minus sigins in this case?

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Rate of reaction is always a positive quantity. Minus sign indicates there is a decrease in concentration of the reactant ie: `(d)[(p)]` is - `(ve)`. So that `(-) xx(-)=+v e .` Plus sign indicates increase in the concentration of the product with time during the reaction `d[Q] is +ve
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