Practice MCQ Questions and answers on Chemistry-GK

An alloy used in making heating elements for electric heating devices is nichrome. It is an alloy of nickel, chromium, (and sometimes iron and other elements or substances). It is used as resistance wire.

Magnetite is an iron ore.

Stainless steels are iron alloys with a minimum of 10.5% chromium. Other alloying elements are added to enhance their structure and properties such as formability, strength and cryogenic toughness. These include metals such as: Nickel.

Mercury form an amalgam with other metals.

Iron is alloyed with carbon lo make steel and has the effect of increasing the hardness and strength of iron. Pure iron cannot be hardened or strengthened by heat treatment but the addition of carbon enables a wide range of hardness and strength. High-carbon stainless steel contains a minimum of 0.3% carbon. The higher the carbon content, the less formable and the tougher the steel becomes.

Bauxite is used in a lot of industries like the chemical industry, refractory, abrasive, cement, steel, and petrol industry amongst others. In chemical, bauxite along with alumina is used in the manufacturing of aluminium chemicals. In refractory, it is used as a raw material for making several products.

Brass is an alloy made of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties. By comparison, bronze is principally an alloy of copper and tin.

Brass is a homogeneous mixture (solid solution) of copper and zinc.

Brass is an alloy of zinc and copper.

Brass is an alloy of Cu and Zn.