In a reaction,$2X \to Y$,the concentration of $X$ decreases from $0.50 \ M$ to $0.38 \ M$ in $10 \ min$. What is the rate of reaction in $M s^{-1}$ during the interval?

In the hydrogenation of ethene at $298 \, K$,the number of moles of hydrogen decreases from $2.2$ to $1.4$ in $50 \, min$. Calculate the rate of reaction in units of $mol \, s^{-1}$.

$NO_2$ required for a reaction is produced by the decomposition of $N_2O_5$ in $CCl_4$ as per the equation $2N_2O_{5(g)} \to 4NO_{2(g)} + O_{2(g)}$. The initial concentration of $N_2O_5$ is $3.00 \, mol \, L^{-1}$ and it is $2.75 \, mol \, L^{-1}$ after $30 \, minutes$. The rate of formation of $NO_2$ is ............... $mol \, L^{-1} \, min^{-1}$

Give the definition of the following terms:
$(i)$ Rate of Reaction
$(ii)$ Average rate of reaction
$(iii)$ Instantaneous rate

Which of the following is a correct representation of the reaction rate for the reaction stated below?
$N_{2(g)} + 3H_{2(g)} \rightleftharpoons 2NH_{3(g)}$

The instantaneous rate of reaction for the reaction $3A + 2B \rightarrow 5C$ is . . . . . . .