The coordination number of Na in Na2O is 4. Na+ ion is surrounded by four oxide ions and O2- ion is surrounded by eight Na+ ions hence the... View Article
A thermosetting plastic is a polymer that irreversibly becomes rigid when heated. Thermoplastics can be repeatedly softened by heating and... View Article
Gallium and caesium are the metals that melt when kept on palm. Gallium melts when kept on palm because they have a very low melting point and... View Article
Answer: (i) Reaction of water with quicklime (ii) Dilution of an acid Exothermic reactions are chemical reactions that release energy as heat... View Article
The substance that loses electrons is being oxidized and is the reducing agent. The substance that gains electrons is being reduced and is the... View Article
When natural gas burns, a high-temperature blue flame is produced and complete combustion takes place. Methane is CH4 and when burnt in oxygen... View Article
Answer: (A) the loss of electrons Oxidation is a process that involves the loss of electrons. Oxidation occurs when the oxidation state of a... View Article
Oxygen is made up of only one kind of atom. Therefore, it is an element. Other are compounds. Any substance that contains only one kind of an... View Article
Etched glass is created by cutting a design stencil that is made of an abrasive resistant material, such as vinyl or rubber. Acid etched glass is... View Article
Oxidation state of Mn in MNO2 is +4. The change in the oxidation state of Mn is 1. Hence, the equivalent weight of MnO2 is the same as its... View Article
Zinc carbonate on heating decomposes to zinc oxide and carbon dioxide gas. Zinc carbonate is a white powdery solid. When it is heated strongly,... View Article
Potentiometric titration is a technique similar to direct titration of a redox reaction. It is an economical titration method It requires a... View Article
To prevent any microorganism from growing in food preservative chemicals are used. These preservatives prevent the microbial infection in the... View Article
When two bodies rub together both positive and negative charges in equal amounts appears simultaneously due to transfer of electron. Thus, for... View Article
Most elements are solids, only 11 are gases and 6 are liquid. Examples of solid elements are sodium, carbon, aluminium. There are six liquid... View Article
Aerial oxidation is the term used for the reaction in which air or oxygen from air is used to oxidize other substance. Rancidity is the term used... View Article
Cutting down of trees not only decreases the amount of O2 but also increases the amount of CO2 liberated. Usually during the photosynthesis... View Article
Almost all halogens are coloured because halogens absorb radiations in the visible region. Fluorine and chlorine are green, bromine is red, and... View Article