Chemistry Online Quiz

Hydrogen bomb is based on the principle of uncontrolled fusion reaction. A hydrogen bomb (also called thermonuclear bomb) is an uncontrolled fusion reaction in which enormous amounts of energy are released.

Silver is not present in German silver. German Silver is an alloy of copper (60%), zinc (20%) and nickel (20%). It is named for its silver-white colour. It is used for making daily utensils and jewellery.

The reduction of a metal oxide to form metal by using aluminium powder as a reducing agent is called a thermite reaction. It is an exothermic reaction in which a large amount of heat is evolved. This reduction property of aluminium is used in welding broken pieces of iron rails and machine parts.

Most of high-level supersonic aircraft produce harmful pollutant CFCs in the stratosphere. This leads to the thinning of the O₃ (ozone) layer.

Oxalic acid is manufactured using sawdust. The heating of sawdust with Potassium hydroxide (KOH) results in the production of oxalic acid.

Photo-oxidation process is initiated by light. The meaning of Photo-oxidation is oxidation under the influence of radiant energy (such as light). It is the degradation of a polymer surface due to the combined action of light and oxygen. It is the most significant factor in the weathering of plastics.

Earth's greenhouse gases trap heat in the atmosphere and warm the planet. The main gases responsible for the greenhouse effect include carbon dioxide, methane, nitrous oxide, and water vapor (which all occur naturally), and fluorinated gases (which are synthetic).

The most common use of ZnS is as a rodenticide, pigment for paints, plastics, and rubber. The sulfides of zinc and of cadmium are the most important basic materials of sulfide-type phosphors.

Ethylene glycol is added to aviation gasoline because it prevents the freezing of petrol. It is an organic compound and has a low freezing point. In the US and Latin countries, the term gasoline is used, but in Europe and Asian countries, it's called petrol.

The atom bomb is discovered by German chemist Otto Hahn. He is referred to as the father of nuclear chemistry and godfather of nuclear fission. Hahn and Lise Meitner discovered radioactive isotopes of radium, thorium, protactinium and uranium.