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What is the role of limestone during the extraction of iron from haematite ore?

Explain the Hall-Heroult process.

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Assertion : Extraction of iron metal from iron oxide ore is carried out by heating with coke.
Reason : The reaction,
$Fe_2O_{3(s)} \to Fe_{(s)} + 3/2 O_{2(g)}$ is a spontaneous process.

What does the slag obtained during the extraction of copper mainly consist of?

The Ellingham diagram is a plot between:

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