Lead monoxide Lead oxide

The microwave hydrothermally treated Fe3O4 particles were basic at pH <7.7 and acidic at pH >7.7, while the nontreated and base-treated particles did not show clear acidic or basic nature.

Lead oxide is a metallic oxide which reacts with hydrochloric acid to produce lead chloride and water, but it is excluded from the class of bases, because chlorine is also produced. Thus, lead oxide is not a base.

Dinitrogen pentoxide

Iron sesquisulfide

FeO

In what way and in what form does sodium react with water? A colourless solution is formed, consisting of strongly alkalic sodium hydroxide (caustic soda) and hydrogen gas. This is an exothermic reaction.

displacement redox reaction

This is a double replacement reaction that is also a neutralization. The reaction is also a neutralization because HCl is an acid hydrochloric acid, and NaOH sodium hydroxide is a base. After the reactions the products are a salt and water.

Zinc react with excess sodium hydroxide to form sodium zincate(Na2​ZnO2​) along with hydrogen gas. Zinc is a transition metal which shows moderate reactivity. Zinc reacts with NaOH to form sodium zincate with the evolution of hydrogen gas.

decomposition reactions

why sodium cannot be stored under water?? As Sodium is a highly reactive metal and quickly undergoes reaction with air or H2O (water or moisture) and burns violently and can explode, so it must be stored in an inert medium such as an inert liquid hydrocarbon (example: kerosene) as moisture cannot enter in it.