Question

Which of the following oxide is not attacked by water?
A. BaO
B. SrO
C. MgO
D. BeO

Answer 1

Hint: A metal hydroxide and hydrogen are formed when a metal reacts with water.
The metal releases electrons when it comes into contact with water. If they exit the metal, these negatively charged particles produce heat. They even split off the water molecules in the way.

Complete step by step answer:
A metal hydroxide and hydrogen are formed when a metal reacts with water.
The metal releases electrons when it comes into contact with water. If they exit the metal, these negatively charged particles produce heat. They even split off the water molecules in the way.

- BaO reacts vigorously with water and an alkaline solution is formed.
\[BaO + {H_2}O \to Ba{(OH)_2}\]

- SrO reacts vigorously with water and an alkaline solution is formed.
\[SrO + {H_2}O \to Sr{(OH)_2}\]

- MgO reacts vigorously with water and an alkaline solution is formed.
\[MgO + {H_2}O \to Mg{(OH)_2}\]

Water has almost no impact on beryllium oxide. Since the BeO molecules are closely held in the solid state, it is insoluble in liquids. Other alkaline earth metals' oxides combine with water to form simple hydroxides.

Note: Water has almost no impact on beryllium oxide. Since the BeO molecules are closely held in the solid state, it is insoluble in liquids. Other alkaline earth metals' oxides combine with water to form simple hydroxides. A metal is an element with metallic bonds and the ability to form positive ions (cations). Metals are often represented as a cloud of delocalized electrons surrounded by a lattice of positive ions.