Which one contains both $Ca$ and $Mg$ ?
Limestone
Dolomite
Chalk
Feldspar
Dolomite is $CaCO _3 \cdot MgCO _3$. So, it contains both Magnesium and Calcium.
Consider two chemical reactions $(A)$ and $(B)$ that take place during metallurgical process:
$(A)$ $\mathrm{ZnCO}_{3(\mathrm{~s})} \longrightarrow \mathrm{A}{\longrightarrow} \mathrm{ZnO}_{(\mathrm{s})}+\mathrm{CO}_{2(\mathrm{~g})}$
$(B)$ $2 \mathrm{ZnS}_{(\mathrm{s})}+3 \mathrm{O}_{2(\mathrm{~g})} \longrightarrow \mathrm{ZnO}_{(\mathrm{s})}+2 \mathrm{SO}_{2(\mathrm{~g})}$
The correct option of names given to them respectively is:
In electrolysis of $Al_2O_3$ by Hall-Heroult process
The process of the extraction of copper from copper pyrites involves:- $(I)$ Froth floatation $(II)$ Calcination $(III)$ Roasting $(IV)$ Self reduction $(V)$ Smelting $(VI)$ Liquation $(VII)$ Electrorefining
Carbon cannot be used in the reduction of $Al_2O_3$ because :
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