Question

solide calcium oxide was taken in a container and water was added to it slowly​

Answer 1

Answer:

When calcium oxide is kept in a container and water is added to it slowly, it produces a crackling sound. Since this is exothermic combination reaction, a lot amount of heat is produced. And calcium hydroxide of slaked lime is formed. This is also used for whitewashing.

Explanation:

Ca+O+ H2O = Ca(OH)2

Since two compounds react to form one product, it is combination reaction.

You will also see some bubbles appearing because of rise in temperature.

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Answer 2

CaO +H2O ---->Ca(OH)2