For a reaction in solution, consider the statements about rate. Select all correct ones.

AThe instantaneous rate at time $t$ is the magnitude of the slope of the tangent to the $[A]$ against $t$ curve at that time.
BThe rate of reaction, defined by dividing each concentration change by its stoichiometric coefficient, has the same value for every species.
CThe rate of formation of any product always equals the rate of reaction.
DFor $2 A 3 B$ the rate of formation of $B$ is $1.5$ times the rate of disappearance of $A$ .

Answer: A, B, D

The instantaneous rate is the tangent slope, and the rate of reaction

r = - \frac{1}{a} \frac{d [ A ]}{d t} = \frac{1}{b} \frac{d [ B ]}{d t}

is the same whichever species is used. The rate of formation of a product equals

r

only when its coefficient is 1. For

2 A 3 B

d [B] / d t = (3/2) (- d [A] / d t)