Question

Explain the following statements
(a) Most metal oxides are insoluble in water but some of these dissolve in water
What are these oxides and their solutions in water called?
(b) At ordinary temperature the surface of metals such as magnesium, aluminium,
zine, et is covered with a thin What is the composition of this layer?
State its importance
te) Some alkali metals can be cut with a knife​

Answer 1

Answer:

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Explanation:

A)Yes most metal oxides are insoluble in water, but some of these dissolve in water

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

Na2O(s) +H2O(l)=2NaOH(aq)

K2O(s)+H2O(l)=2KOH(aq)

B)At ordinary temperatures the surfaces of metals like Magnesium, Aluminium and Zinc are covered with a thin layer. ​This layer is important because it prevents the further oxidation of the metal and helps in protecting the metal from getting tarnished.

C)alkali metal that can be cut with knife is Potassium , sodium

due to their nature they are soft and easily cut through knife

Answer 2

Answer:

a) basic oxide, alkali

b) when exposed to air, form protective layer of oxide on their surface. It protect from corrosion

c) Li, K, Na