General Princip...

NaCN is sometimes added in the froth flotation process as a depressant when ZnS and PbS minerals are expected because __________.

Siderite is an ore of:

Which one of the following is the chief ore of copper?

Select correct statement(s) about differentiation floatation.

Oxides of the various metals are converted into metal by heating but not in :

In electrolysis of $$Al_2O_3$$ by Hall-Heroult process, _____________.

Selection of temperature to carry out a reduction process depends so as to make :

Consider following equilibrium

$$3Fe(s)\, +\, C(s)\, \rightleftharpoons\, Fe_3C(s),\quad \Delta H^{\circ}\, >\, 0$$

The reduction of an oxide by aluminium is called __________.

Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out ______________.