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Explain the following given examples. ...

Explain the following given examples.
Colloid

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Calcination involves heating of the ore in the absence of air just.below its fusion temperature. Volatile matter.escapes i leaving behind the metal oxide. Calcination makes.the ore porous and is made in reverberatory furnace
`Fe_(2)O_(3).xH_(2)O(s) rarr Fe_(2)O_(3)(s)+xH_(2)O(g)`
`CaCO_(3).MgCO_(3)(s) rarr CaO(s)+MgO(s)+2CO_(2)(g)`
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