Rust is

A. A mixture of FeO and Fe(OH)2

B. A mixture of Fe2O3 and Fe(OH)2

C. A mixture of Fe2O3, 3H2O and FeO

D. FeO only

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  2. The metal used in storage batteries
  3. Which of the following characters is not shown by hydrogen
  4. The metallic constituents of hard water are
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  18. The hardest substance available on earth is
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  20. The intencity of Earthquakes is measured on
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