Question

Find the number of reaction from the given reaction which can show calcination process :
(i) `CaCO_(3).MgCO_(3) overset (Delta) rarr CaO + MgO + CO_(2)`
(ii) `CuCO_(3).Cu(OH)_(2) overset (Delta) rarr 2CuO + H_(2)O + CO_(2)`
(iii) `Al_(2)O_(3). 2H_(2)O overset (Delta) rarr Al_(2)O_(3) + 2H_(2)O`
(iv) `2Cu_(2)S + 3O_(2) overset (Delta) rarr 2Cu_(2) O + 2SO_(2)`.

Answer 1

Correct Answer - `(3)`
Calcination is heating the ore strongly in absence of `O_(2)` or air. Reactions (i),(ii), and (iii) are calcination reactions.