Which is an alloy of aluminium?

Which is not an alloy of aluminium :

Statement-I : Adamantine silicon is obtained by heating silica with aluminium. Statement-II : Adamantine silicon is an alloy of aluminium and silicon.

Gernan silver is an alloy of aluminium.

Magnalism is an alloy of aluminium and magnesium. What is the percentage of of magnesium in this alloy?

Magnalism is an alloy of aluminium and magnesium. What is the percentage of of magnesium in this alloy?

Which alloy of aluminium is used in air-craft industry ?

(a) What are the special featured of structures of boron ? (b) Which alloy of aluminium is used in air-carft industry ? ( c) When finely powdered Al is suddenly exposed to air, at cataches fire. Why ? (d) Write a balanced equation for the preparation of elemental boron by reduction of BBr_(3) with dihydrogen.

Name one alloy of Aluminium.