NCERT Class XII Chemistry
Chapter - General Principle of Process of Isolation of Elements
Questions with Solutions
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Question : 13
Total: 31
How can you separate alumina from silica in a bauxite ore associated with silica? Give equations, if any.
Solution:
Serpeck’s process is used when silica is present in considerableamounts in bauxite ore. The ore is mixed with coke and heated at 1800°Cin presence of nitrogen, where AlN is formed.
A l 2 O 3 + 3 C + N 2 → 2 A l N + 3 C O
Silica is reduced to silicon which volatilises off at this temperature.
s i O 2 + 2 C – – – – – – ▶ S i + 2 C O
Silica is reduced to silicon which volatilises off at this temperature.
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