JEE Main 2022 · 27 Jul · Shift 1, Chemistry question 82

$$\mathrm{2NO+2H_2\rightarrow N_2+2H_2O}$$

The above reaction has been studied at 800°C. The related data are given in the table below

Reaction serial number	Initial Pressure of $\mathrm{H_2}$ / kPa	Initial Pressure of NO / kPa	Initial rate $\left(\dfrac{-dp}{dt}\right)$ / (kPa/s)
1	65.6	40.0	0.135
2	65.6	20.1	0.033
3	38.6	65.6	0.214
4	19.2	65.6	0.106

The order of the reaction with respect to NO is ______.