What is the chemical formula of alumina?
- A$Al_{2}O_{3}$
- B$Al_{2}O_{3} \cdot 2H_{2}O$
- C$Al_{2}O_{3} \cdot H_{2}O$
- D$NaAlO_{2}$
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Give reasons for the following:
$(i)$ Alloys are used in electrical heating devices rather than pure metals.
$(ii)$ Gold ornaments look new even after several years of use.
$(iii)$ An iron grill should be painted frequently.
$(i)$ Alloys are used in electrical heating devices rather than pure metals.
$(ii)$ Gold ornaments look new even after several years of use.
$(iii)$ An iron grill should be painted frequently.
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$(a)$ Magnesium is treated with very dilute $HNO_3$.
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