Question

Aluminium appears like gold when mixed with :
A.$90\% $ Cu
B.$75\% $ Ni
C.$80\% $ Sn
D.$80\% $ Co

Answer 1

Hint:
Rolled gold is a famous alloy of Copper and Aluminium. It is utilized in making cheap ornaments. AlNiCo is said to be a cobalt nickel aluminium alloy. Aluminium is known for making a number of alloys.

Complete step by step answer:
$10\% $ Aluminium gets mixed with $90\% $ Copper in an alloy to form rolled gold which gives it a gold-like appearance.
 -An alloy is a mixture of two or more metals.
-Duralumin is another copper-aluminium alloy.
-Silumin (aluminium, silicon)
-Aluminium alloys are desirable in many applications due to their high strength to weight ratio and corrosion resistance
So the correct option is A.

Additional information: Aluminium alloy may be a chemical composition where other elements are added to pure aluminium so as to boost its properties, primarily to extend its strength. These other elements include iron, silicon, copper, magnesium, manganese and zinc at levels that combined may form up the maximum amount as fifteen percent of the alloy by weight. There are two principal classifications, namely casting alloys and wrought alloys, both of which are further subdivided into the categories heat-treatable and non-heat-treatable. About all of aluminium is employed for wrought products. Alloying requires the thorough mixing of aluminum with these other elements while the aluminium is in molten – liquid – form.

Note:Aluminium alloys can particularly be true in transport applications and in pressure systems where the strength of materials is often purposefully kept low. Aluminum, however, has its own set of disadvantages: (i) high cost compared with steels; (ii) relatively low fracture toughness in high strength conditions; and (iii) limited performance at elevated temperature.