Ferrosilicon is used in the steel industry as:

When a small amount of vanadium is added to steel,it becomes:

What is the color of $K_2MnO_4$?

Which pair of elements from the following is used to make an alloy for trophies?

Write about the utility of $d$- and $f$-block elements and their compounds. Or describe the following uses of $d$- and $f$-block elements and their compounds: $(i)$ In iron/steel $(ii)$ As pigments $(iii)$ In batteries $(iv)$ In coinage $(v)$ As catalysts.

Describe the preparation of potassium dichromate from iron chromite ore. What is the effect of increasing $pH$ on a solution of potassium dichromate?