What is the chemical formula of bauxite?
- A$Al_{2}O_{3} \cdot 2H_{2}O$
- B$Fe_{2}O_{3} \cdot xH_{2}O$
- C$Al_{2}O_{3}$
- D$NaAlO_{2}$
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Which of the following metals are obtained by electrolysis of their chlorides in molten state?
$(i)$ $Na$
$(ii)$ $Ca$
$(iii)$ $Fe$
$(iv)$ $Cu$
$(i)$ $Na$
$(ii)$ $Ca$
$(iii)$ $Fe$
$(iv)$ $Cu$
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$(iv)$ Sodium hydroxide
$(v)$ Nitric acid
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Silver and gold react with oxygen at high temperatures.
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