The substance used in the thermite process of reducing metal ores is

The vector $c \cdot (b+c) \times (a+b+c)$ is equal to

Which one of the following is not a biofertilizer?

$A$ conducting rod of length $\ell$ is moving with velocity $v$ in a uniform magnetic field $B$ directed into the plane of the paper,as shown in the diagram. Which end of the rod is at a lower potential?

Widal test is used for the diagnosis of

Which of the following is not produced during the electrolysis of brine solution?