-p-Block elements - I — Chemistry STD 11 Science — Question

$\Delta {H_{{\rm{System}}}} = 2000\ kJ/mol$

$T = 400\ K$

Find out value of $\Delta {S_{{\rm{System}}}}$..........$ kJ/mol-K$

$(a)$ 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.

$(I)$ Low enthalpy of dissociation of $F-F$ bond

$(II)$ High hydration enthalpy of $F^-$

$(III)$ Low atomisation enthalpy of $F_2$