True or False for the following: 1. Malachite and azurite are two native metals

Question

True or False for the following:

1. Malachite and azurite are two native metals that are also classified as strategic metals.

2. Tempering is heating a mineral to high enough temperature to separate its metallic component from any nonmetallic residue, called slag.

3. Which of the following describes deposits of bauxite?

a. lumpy accumulations on the seafloor

b. residual mineral deposits in soil that has everything leached out but the aluminum

c. precipitates from ground water that has dissolved lead and zinc at depth, then transported them to the surface

d. alternate beds of gray iron oxide and red lenses of jasper

e. precipitates from groundwater that have dissolved out of one ore deposit and concentrated in another

b. residual mineral deposits in soil that has everything leached out but the aluminum

Explanation / Answer

Answer. 1.Flase.
Native metal is any metal that is found in nature in its elementary form. example- gold, copper, etc. Malachite and azurite are hydroxide minerals.
Answer 2. False.
Tempering is a heat treatment technique is applied to ferrous alloys, such as steel and cast iron, to achieve greater touchness by decreasing the hardness of the alloy.
Answer. 3. b. residual deposits in soil that has everything leached out but the aluminium.
Bauxite ore is the main source of aluminium. Bauxite is a variety of laterite(residual sedimentary rock).

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