# Number of nodal plane in px-orbital is

$\begin{array}{1 1}(a)\;1&(b)\;2\\(c)\;3&(d)\;0\end{array}$

No of nodal planes in an orbital = l [azimuthal quantum number]
For p orbital l = 1
Hence Nodal plane in p-orbital =1
Hence (a) is the correct answer.
edited Oct 6, 2017