Chemistry · Importance of coordination compounds (in qualitative analysis, extraction of metals and in biological systems)
In the extraction of aluminium by electrolytic process, cryolite is added to
In the extraction of aluminium by electrolytic process, cryolite is added to
- A. lower the melting point of alumina
- B. increase the electrical conductivity
- C. minimise the anode effect
- D. remove impurities from alumina
Step-by-step solution
In the Hall-Héroult process for aluminium extraction, cryolite (Na3AlF6) is added to alumina (Al2O3) to lower its melting point from about 2000°C to around 950°C, making the electrolytic process feasible. While it also increases electrical conductivity, the primary purpose is to lower the melting point.
Related MCQs
- Which metal is leached from its ore by the use of…
- Formation of volatile _{4} \) and its subsequent heating gives pure Ni This process is called…
- Given below are the steps for extraction of copper from its ore. The balance reaction involved in reduction of copper(l) oxide with copper(l…
- The disodium salt of ethylene diamine tetracetic acid can be used to estimate the following ion(s) in the aqueous solution.…
- ASSERTION: In the extraction of Ag, complex _{2}\right] \) is reacted with Zn. REASON: Zn is a d-block transition metal.…