The Al2O3 content of cryolite in Hall-Heroult cell is maintained between _______________ percent ?

Related Mcqs:

In “Imperial Smelting Process” for extraction of zinc, zinc vapour thus produced is quenched in the external condenser by the use of the following _______________________?

A. Jet of water at high pressure B. Blast of air C. Mixture of water and air D. Rain of molten lead...

Heating of ferromagnetic materials to a temperature above Curie temperature makes it ________________________?

A. Insulator for heat & electricity transmission B. Ferritic C. Behave like paramagnetic materials D. Superconductor...

Hydrogen in liquid steels is dissolved_________________?

A. As tiny gas bubbles B. In the atomic form C. In the ionic form D. In the molecular form...

A pycnometer is used for the measurement of________________________?

A. Flow rate of molten metal B. Specific gravity of a liquid C. Composition of alloys D. Concentration of a solution...

What is the value of entropy at 273°K ?

A. 0 B. 1 C. ∞ D. None of these...