Question

Magnesium is an alloy of:
1. $Al+Mg$
2. $Al+Cu+Mg+Mn$
3. $Al+Zn+Mg+Ni$
4. $Al+Cu$

Answer 1

An alloy is a combination of metals or metals combined with one or more other elements. Alloys are defined by metallic bonding character. There are mainly two types of alloys: (1) Substitution alloys and (2) Interstitial alloys.
For this question, we will have an option basis approach and check if the options have any alloy or not. If they have any alloy then we should know it’s name.

Complete step by step answer:
Option D: the alloy of aluminum and copper is called aluminium bronze. It is a type of bronze in which aluminium is the main metal added to copper.
Therefore, option D can not be our answer.

Option B: The alloy of aluminium, copper, magnesium and manganese is called Duralumin. It contains $90-95$ aluminium.
Therefore option is B not our answer.

Option C: There is no alloy that contains exactly these four elements namely Aluminium zinc, magnesium and Nickel. Some alloys contain them along with an addition of silicon. (Si)
So, option C is also not correct.

Option A: It is the correct option magnesium is an alloy of aluminium (Al)
and (Mg) magnesium. Magnalium contains $5$ magnesium and $95$ aluminium. This makes aluminium to be it’s major component.
So, the correct answer is “Option A”.

Note: (a) Duralumin is a strong, light – weight alloy which has been widely used in the aircraft industry for a very long time. It is also used in frames of speed boats and automobiles and is used to manufacture components of measuring instruments.
(b) Magnalin is lighter and more workable than usual aluminium and is used in making metal mirrors and scientific instruments.