sblock Elements 2 Question 4
4. The alloy used in the construction of aircrafts is
(2019 Main, 10 April I)
(a) $\mathrm{Mg}-\mathrm{Zn}$
(b) $\mathrm{Mg}-\mathrm{Mn}$
(c) $\mathrm{Mg}-\mathrm{Sn}$
(d) $\mathrm{Mg}-\mathrm{Al}$
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Answer:
Correct Answer: 4. (d)
Solution: Names of magnesium alloys are given by two letters followed by two numbers. The common alloying elements are $A$ (Aluminium), $Z$ (zinc), $T$ (tin), $M$ (manganese) etc. Numbers indicate respective nominal compositions of main alloying elements, e.g.
’ $A Z 91$ ’ implies the composition of the alloy as : $\mathrm{Al}=9 %, \mathrm{Zn}=$ $1 %$ and $\mathrm{Mg}=100-(9+1)=90 %$
Among the alloys given, $\mathrm{Mg}-\mathrm{Al}$ (Magnalium ; $\mathrm{Mg}=5 %, \mathrm{Al}$ $=95 %$ ) is being light, tough and strong, hence it is used in aircrafts.
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