Artificial rubies and sapphires can be made by heating alumina in ?

An oxy-hydrogen flame

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An oxy-acetylene flame

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Burning methane

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An electric furnace

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Solution

The correct option is A An oxy-hydrogen flame
Artificial ruby and sapphires are manufactured from alumina to which 1.5% of magnetic iron oxide and 0.5% of titanium oxide has been added, the mixture is fused and crystallised in an oxy-hydrogen flame. It is a reducing flame.

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Which of the following is used for the production of oxy-acetylene flame for welding and cutting metals?

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