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How many reaction can show slag formatio...

How many reaction can show slag formation process from the given reaction ?
(i) `SiO_(2) + CaO rarr CaSiO_(3)`
(ii) `FeO + SiO_(2) rarr FeSiO_(3)`
(iii) `CaO + P_(2)O_(5) rarr Ca_(3)(PO_(4))_(2)`
(iv) `Cr_(2)O_(3) + 2Al rarr Al_(2)O_(3) + 2Cr`
(v) `MgCO_(3) + SiO_(2) rarr MgSiO_(3) + CO_(2)`.

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Reactions (i),(ii),(iii) and (iv).
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