Question

Which of the following methods are used more in industry for $CaO$ preparation?
$Ca+O_2\to CaO$......(1)
$CaC{O}_3\left(s\right)\stackrel{△}{\to }CaO\left(s\right)+C{O}_2\left(g\right)$....(2)
$Ca(OH{)}_2\stackrel{calcination}{\to }CaO+H_{2}O$.....(3)

• A. Only $2$
• B. Only $3$
• C. Both $2$ and $3$
• D. All of these

Answer 1

The correct option is C Both $2$ and $3$

It is difficult to provide pure oxygen for reaction with Calcium on industrial scale. This is because air contains 79% nitrogen. The reactions of the Ca metal with air rather than oxygen is complicated by the fact that they all react with nitrogen to produce nitrides. In each case, you will get a mixture of the metal oxide and the metal nitride.

That is why method 2 and 3 are preferred in industries.