Identify the name of compound

from following.

Identify the physical quantity that is measured in Candela.

Calculate the edge length of unit cell of metal which crystallises to bcc structure.

(Radius of metal atom $$=173 \mathrm{~pm}$$ )

What is new temperature of a gas when its initial volume $$3 \mathrm{~dm}^3$$ at $$300 \mathrm{~K}$$ is doubled at constant pressure?