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General Principles and processes of Isolation of Elements
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Which of the following process involves smelting
A
$2PbS + 3O_2 \to 2PbO + 2SO_2 \uparrow $
B
$Al_2O_3 . 2H_2O \to Al_2O_3 + 2H_2O$
C
$Fe_2O_3 + CO \to 2Fe + 2CO_2$
D
$C{r_2}{O_3}\xrightarrow{{Al}}2Cr + A{l_2}{O_3}$
Solution
Smelting : The process of extraction of metal in its molten state by any reducing agent in presence of flux is called smelting.
For example : oxides of less electro – positive metals like $Pb , Zn , Fe, Cu$ are reduced by any other reducing agents.
Reactions: $Fe _2 O _3+3 CO \rightarrow 2 Fe +3 CO _2$
Standard 12
Chemistry
