(A) : The radial probability distribution curves of 1s, 2p, 3d orbitals are identical in shape.
(R) : The number of nodal planes present in these orbitals is different.

(A) : The radial probability distribution curves of 1s, 2p, 3d orbitals are identical in shape.

Radial nodes =n-l

1s orbital =1-0 =1

2p  orbital =2-1=1

3d orbital =3-2=1

(R) : The number of nodal planes present in these orbitals is different.

l=0 for s -orbital

l=1 for p -orbital

l=2 for d -orbital

so both assertion and reason are true but ‘R’ is not the correct explanation of ‘A’