What is meant by a skeletal chemical equation?

Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is (are) true about slaking of lime and the solution formed?
$(i)$ It is an endothermic reaction
$(ii)$ It is an exothermic reaction
$(iii)$ The $pH$ of the resulting solution will be more than seven
$(iv)$ The $pH$ of the resulting solution will be less than seven

Write the chemical equation of the reaction with an example in which a change in colour takes place.

The coating formed on the metals such as iron, silver, and copper after corrosion will be:

Write two observations for the following chemical reaction:
$(a)$ Dilute sulphuric acid is poured over zinc granules.

Which one of the following processes involves chemical reactions?