NCERT Class XII Chemistry
Chapter - General Principle of Process of Isolation of Elements
Questions with Solutions
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Question : 29
Total: 31
What is the significance of leaching in the extraction of aluminium?
Solution:
Leaching is significant as it helps in removing the impurities likeS i O 2 , F e 2 O 3
+ 2 N a O H ( a q ) + 3 H 2 O ( l )
+ 2 N a O H ( a q )
+ H 2 O ( l )
2 N a [ A l ( O H ) 4 ] ( a q ) + 2 C O 2 ( g ) – – – – – – ▶ A l 2 O 3 . x H 2 O ( s ) ↓ + 2 N a H C O 3 ( a q ) A l 2 O 3 . x H 2 O ( s )
A l 2 O 3 ( s ) + x H 2 O ( g )
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