Chemistry of Metals and Alloys

Crude oil contains trace amounts of metals including magnesium (Mg), nickel (Ni), and vanadium (V) which occur naturally in petroleum. Chromium (Cr) is not typically found in crude oil deposits. These metals can poison catalysts during refining and need to be removed.

The color of copper is reddish brown.

No plating is done on gold.

An alloy of mercury with another metal (usually silver) used by dentists to fill cavities in teeth. Except for iron and platinum, all metals dissolve in mercury and chemists refer to the resulting mercury mixtures as amalgams.

The metals which are higher in the activity series are generally extracted by electrolysis of their fused salt.

Iron becomes passive in contact with high conc.HNO₃   (80%) because an oxide coating of iron is formed on the surface.

It is used to make the filament of a bulb.

The metallic element in RBCs is Iron.

Correct answer

Iron, copper and gold are metals, all of which have a lustrous surface. Metals are good conductors of heat and electricity and are opaque. 

These days, digital thermometers are used to measure the temperature, as they do not contain mercury.

Yes, both are paramagnetic.

Nickel silver is an alloy of copper, nickel and zinc.

It is correct.

Cloth, leather and scale are non-magnetic in nature.