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Alloy of sodium with mercury.

The molecular formula of the common ore of aluminium is _____.

$\mathrm{A}:{\mathrm{Al}}_2{\mathrm{O}}_3.{\mathrm{H}}_2\mathrm{O}, \mathrm{B}:{\mathrm{Al}}_2{\left({\mathrm{SO}}_4\right)}_3, \mathrm{C}:{\mathrm{Fe}}_2{\mathrm{O}}_3$ (Enter your correct answer as $\mathrm{A}, \mathrm{B} \mathrm{or} \mathrm{C}$)

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The oxide that forms salt and water by reacting with both acid and base.

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The device used for grinding an ore.

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The nonmetal having electrical conductivity.

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 The reagent that dissolves noble metals.

Make pairs of substances and their properties

Identify the pairs of metals and their ores from the following.

Explain the term.

Metallurgy