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General Principles and processes of Isolation of Elements
medium
Consider the following statements :
Roasting is carried out to :
$(i)$ convert sulphide to oxide and sulphate
$(ii)$ remove water of hydration
$(iii)$ melt the ore
$(iv)$ remove arsenic and sulphur impurities
Of these statements :
A
$(i), (ii)$ and $(iii)$ are correct
B
$(i)$ and $(iv)$ are correct
C
$(i), (ii)$ and $(iv)$ are correct
D
$(ii), (iii)$ and $(iv)$ are correct
Solution
During roasting, sulphide is converted to oxide and sulphate.
$2 ZnS +3 O _2 \rightarrow 2 ZnO +2 SO _2$
$ZnS +2 O _2 \rightarrow ZnSO _4$
The water of hydration is removed.
The volatile Arsenic and Sulphur impurities are removed.
Standard 12
Chemistry
