Why does molten sodium chloride conduct electricity?

In the case of small cuts,bleeding is stopped by applying potash alum. Here alum acts as

If $P=(0,1,0)$ and $Q=(0,0,1)$, then the length of the projection of the line segment $PQ$ on the plane $x+y+z=3$ is

Which of the following molecules/species has the minimum number of lone pairs on its central atom?

Which kingdom is characterized by the presence of a rigid cell wall and nucleoprotein as genetic material?

$A$ magnet freely suspended in a vibration magnetometer makes $40$ oscillations per minute at place $A$ and $20$ oscillations per minute at a place $B$. If the horizontal component of earth's magnetic field at $A$ is $36 \times 10^{-6} ~T$,then its value at $B$ is