Fungal herbicides are produced by which of the following?

The height of the cone of maximum volume inscribed in a sphere of radius $R$ is

If the impurity in a metal has a greater affinity for oxygen and is more easily oxidised than the metal,then the purification of metal may be carried out by

If the normal to the curve $y^2 = 5x - 1$ at the point $(1, -2)$ is of the form $ax - 5y + b = 0$,then $a$ and $b$ are:

Choose the correct alternative answer

$a...be....a....beda.....ccd....bed.$

Which of the following has the highest calorific value?