The packing efficiency of the twodimensional square unit cell shown below is

The complex showing a spin-only magnetic moment of 2.82 B.M. is :

In the reaction,

The structure of the product T is :

One mole of an ideal gas is taken from $\mathbf{a}$ to $\mathbf{b}$ along two paths denoted by the solid and the dashed lines as shown in the graph below. If the work done along the solid line path is $W_{\text {s }}$ and that dotted line path is $W_{\mathrm{d}}$, then the integer closest to the ratio $W_{\mathrm{d}} / W_{\mathrm{s}}$ is