100+ Metals, Nonmetals, Metalloids Multiple Choice Questions - 2

Question: 6

Define the term mineral and ore?

The inorganic elements or compounds of various metals associated with their earthly impurities are called minerals.

Those minerals from which metals can be extracted profitably and conveniently are called ores.

Question: 7

Why are metals highly electropositive?

Generally metals have either one, two or three electrons in their outer most valence shell. Hence they have the tendency to donate the electrons and thereby they are highly electropositive.

Question: 8

Why is atomic hydrogen used for welding?

When atomic hydrogen combine to form a molecule an enormous amount of heat is released. This heat is used to melt and fuse the metal. (i.e. in welding)

Question: 9

What is the composition and uses of magnalium?

Magnalium consists of aluminium, magnesium and calcium. It is used in making scientific instruments.

Question: 10

What is annealing?

The process of heating hard steel to redness and then allowed to cool slowly. This process is called annealing. Annealing makes the steel soft.

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