Which of the following properties is of the thermosetting polymers?

Equilibrium constant for a reaction is 20. What is the value of $$\Delta G^{\circ}$$ at $$300 \mathrm{~K} ?\left(R=8 \times 10^{-3} \mathrm{~kJ}\right)$$

If entropy of a solid is greater than zero, at $$T=0$$, it is called

Silver crystallises in fcc structure, if edge length of unit cell is 316.5 pm . What is the radius of silver atom?