A gas absorbs certain amount of heat and expands by $200 \mathrm{~cm}^3$ against a constant external pressure of $2 \times 10^5 \mathrm{Nm}^{-2}$. What is work done by system?

Which of the following is primary allylic alcohol?

Identify elements present in copper pyrites.

The vector equation of a line whose Cartesian equations are $y=2,4 x-3 z+5=0$ is