Which of the following can be used to extinguish a fire caused by sodium,potassium,and lithium?

The spleen is a:

An auditorium has a volume of $10^5 \ m^3$ and a total absorption area of $2 \times 10^4 \ m^2$. Its average absorption coefficient is $0.2$. The reverberation time of the auditorium in seconds is:

The image of the point $(3, 2, 1)$ in the plane $2x - y + 3z = 7$ is

If $\bar{a}, \bar{b}, \bar{c}$ are mutually perpendicular vectors having magnitudes $1, 2, 3$ respectively,then $[\bar{a}+\bar{b}+\bar{c} \quad \bar{b}-\bar{a} \quad \bar{c}] = $

The sugar present in milk is