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Formula for Weight

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Going down Group VII, reactivity decreases while melting and boiling point increases.

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Going down Group I, reactivity increases, while melting point decreases.

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Limestone is decomposed by heat to form calcium oxide and carbon dioxide.

CaCO₃ (s) –> CaO (s) + CO₂ (g)

Calcium oxide reacts with the main acidic impurity, silicon dioxide to form molten slag.

CaO (s) + SiO₂ (s) –> CaSiO₃ (l)

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Coke reacts with oxygen in the air to form carbon dioxide.

C (s) + O₂ (g) –> CO₂ (g)

Coke then reacts with carbon dioxide to form carbon monoxide.

C (s) + CO₂ (g) –> 2CO (g)

Carbon monoxide reduces haematite to form molten iron and carbon dioxide.

Fe₂O₃ (s) + 3CO (g) –> 2Fe (l) + 3CO₂ (g)

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Add dilute nitric acid, followed by silver nitrate solution. If a yellow precipitate forms, it shows the presence of iodide ions.

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