An elementary reaction A and B is second order reaction. Which of the following rate equation must be correct?

Consider the elementary reaction sequence shown in figure. Which of the following equations are correct ?

The overall order of reaction between X & Y is 3. Which of the following rate equation must be correct, if on doubling the concentration of X, the rate of reaction gets doubled ?

Consider the elementary reaction sequence shown in figure. Which of the following equations are correct?

If rate constant is numerically the same for three reaction of first, second and third order respectively, then which of the following is correct?

The unit of rate constant for a second order reaction is

Which of the following graphs is for a second order reaction?