Question

most metal oxides are insoluble in water but some of these dissolve in water. what are these oxides called?​

Answer 1

$\huge\underline\red{Answer:-}$

Sodium oxide and Potassium oxide dissolve in water . These solutions in water are called Alkalis.

Answer 2

Answer:

Metal oxides are basic in nature and hence if they get dissolved in water they are called alkaline metals.