Question

name a metal oxide that are soluble in water

Answer 1

calcium oxide
magnesium oxide

Answer 2

hey mate
Metal Oxides that are formed from elements in group IA and IIA, except for Be and Mg, react with water to create Hydroxides. As you can probably see from the periodic table, these elements are Li, Na, K, Rb, Cs, Ca, Sr, Ba.

Of course, the hydroxides of these metals are soluble. However, bear in mind that Be(OH)2 

hope it helps Mark as brainliest and follow