for the reaction, `2A + B rarr 3C + D`, which of the following does not express the reaction rate

Options

A. `(-d[A])/(2dt)`
B. `(-d[C])/(3dt)`
C. `(-d[B])/(dt)`
D. `(d[D])/(dt)`

Answer

B

Explanation

For the reaction
`2A+Brarr2C+D`
we have Rate `=-(d[A])/(3dt)=-(dt)=-(d[B])/(dt)=(d[C])/(3dt)=(d{D])/(dt)`
For reactants we use negative sign, because `d` [reactant] is a negative eqantity (as concentration of reactant is decreasesing), thus, it is multipited by `-1` to make the rate of the reaction a positive equantity.