What is the chemical formula of copper pyrites?
- A$Cu_{2}S$
- B$CuFeS_{2}$
- C$Cu_{2}O$
- D$Cu(OH)_{2} \cdot CuCO_{3}$
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Which metal oxide dissolves in water to form an alkali?
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$(i)$ $Au$
$(ii)$ $Cu$
$(iii)$ $Na$
$(iv)$ $K$
$(i)$ $Au$
$(ii)$ $Cu$
$(iii)$ $Na$
$(iv)$ $K$
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