Which element from the following exhibits a common oxidation state of $+2$?

Which of the following salts increases the rate of the setting process of Plaster of Paris?

The number of water molecules in gypsum and plaster of paris respectively are

Explain the chemical properties of alkaline earth metals (Group $2$) in detail.

Electric furnaces are lined with magnesia because

The solubility of carbonates of the alkaline earth metals decreases down the group. This is due to a decrease in which of the following?