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chemistry

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

A

An oxy-hydrogen flame

B

An oxy-acetylene flame

C

Burning methane

D

An electric furnace

Answer

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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