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  4. Assertion: 3dz2 orbital is spherically symmetrical. Reason: The shapes of all five d-orbitals are similar to each other.

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Q. Assertion: $3d_{z^{2}}$ orbital is spherically symmetrical.
Reason: The shapes of all five $d$-orbitals are similar to each other.

Structure of Atom

Solution:

s-orbital is spherically symmetric, $p$-orbitals have dumbell shape and d-orbitals have double-dumbells. Among all five $d$-orbitals, $d _{z^{2}}$ has a different shape where it has one dumbell along $z$-axis and electron ring perpendicular to it. In the absenceof any field the orbitals have same energy i.e. they are degenerate orbitals but have different shape/orientation.
Both Assertion and Reason are incorrect
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