Most of the metal oxides are basic while most of the non metal oxides are acidic.

• Metal oxides generally contain metal cation and oxide anion so they generally react to form bases.

• Non Metals react with water to form acids or with bases to form salts. Most nonmetal oxides are acidic and form oxyacids.

• Sulphur Oxides, Nitrogen Oxides etc are examples of non metal oxides.

• An alloy is a mixture of metals or a mixture of a metal and another element.
• Alloys may be homogenous or heterogeneous mixtures. 

Copper alloys are metal alloys that have copper as their principal component. They have high resistance against corrosion. The best known traditional types are bronze, where tin is a significant addition, and brass, using zinc instead.

If one of the metals is mercury then the alloys are categorized as amalgams. Zinc amalgam is used in organic synthesis. It is an industrially valuable amalgam.

Therefore, A is the correct option.

• Non-metals exist in all the three form i.e. solid, liquid and gaseous form.
• They are not ductile, not sonorous, not malleable and are usually dull (except graphite)

 Non-Metals can form covalent chlorides because they can share electrons with chlorides.

Non-Metals-These are the elements which come on the right side of the periodic table. Eg-Chlorine, Fluorine, Nitrogen.

• Oxides of non-metals are usually acidic.

• In its chemical formula, an oxide is a compound that contains at least one oxygen atom and one other element.

• Usually non metallic oxides are acidic in nature because when they are reacted with water it leads to the formation of the acidic solution.

• Non-metal oxides such as sulphur dioxide and nitrogen oxide are responsible for acid rain.

• Itself, ‘Oxide’ is the dianion of oxygen, an O^2– ion.

• In the oxidation state of −2, Metal oxides typically contain an anion of oxygen.

• Earth's crust mainly consists of Solid oxides.