MCQ
Which of the following is a polar molecule ?
- A$SiF_4$
- B$XeF_4$
- C$BF_3$
- ✓$SF_4$

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${I_2}(g)$ $\rightleftharpoons$ $2I(g),\;\Delta H_r^o(298\,K) = + 150\;kJ$
$(a)$ Electron density in the $XY$ plane in $3d_x^2 - 3d_y^2$ orbital is zero
$(b)$ Electron density in the $XY$ plane in $3d_z^2$ orbital is zero
$(c)$ $2s$ orbital has one nodal surface
$(d)$ For $2pz$ orbital $YZ$ is the nodal plane.
Specify True or False.