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What is the definition of acid according...

What is the definition of acid according to Bronsted?

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Roasting: In roasting, the ore is heated in a regular supply of air in a furance, at a temperature, below the melting point of the metal.
The ore loses sulphur as its oxide leaving behind oxide of the . metal. Roasting is done in reverberatory or blast furnace. `2Zns+3O_(2) rarr 2ZnO+2SO_(2)`
`2PbS+3O_(2) rarr 2PbO+2SO_(2)`
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